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Combined Sewer Overflow Reporting

State regulations (314 CMR 16.00) require the City of Cambridge to notify the public when certain events occur that result in untreated wastewater being released into surface water--a river or stream. Notifications are posted below and also sent out via email. All Data are preliminary and subject to change. Subscribe to Cambridge's Combined Sewer Overflow (CSO) Alerts.

 

City of Cambridge Public Notification Plan

The City of Cambridge submitted to the Massachusetts Department of Environmental Protection (MassDEP) a Public Notification Plan describing how it will comply with the requirements of An Act Promoting Awareness of Sewage in Public Waters, signed into law in 2021. MassDEP issued an approval of Cambridge's Public Notification Plan on June 16, 2023. The Cambridge Public Notification Plan was modified to reflect reporting of the "average" discharge (not "median" discharge) from data reported to MassDEP and EPA for the prior three years..

A combined sewer overflow (CSO) occurs when a large storm overwhelms the combined sewerage system causing rainwater to mix with wastewater and discharge to a nearby water body.  This relief measure prevents sewage backups into homes and businesses.  Cambridge owns combined sewer outfalls that discharge to the Charles River and Alewife Brook.  When a CSO occurs at a Cambridge-owned outfall, there will be a notification displayed in the table below.

The Massachusetts Water Resource Authority (MWRA) and the cities of Boston, Chelsea and Somerville manage their own combined sewer outfalls, including CSO reporting.  These communities must be contacted directly for information regarding their CSO discharges. To see where all CSO outfalls are located, download this MWRA map of MWRA and community CSO sites.

PUBLIC HEALTH NOTIFICATIONS

State regulations require local public health departments to provide notice to the public when these discharges may create a risk to public health, including when a discharge lasts for two or more  hours.  Public health warnings related to sewage discharges will be posted on the Cambridge Public Health Departments News & Events webpage.

Public health officials recommend avoiding contact with water bodies during rainstorms and for 48 hours afterwards, as there may be increased health risks due to bacteria or other pollutants associated with urban stormwater runoff and CSO discharges.  To see what Cambridge is doing to address pollutants from stormwater runoff please visit our stormwater management website and learn how you can also help reduce stormwater pollution. For more information on water quality data in the Charles River and the Mystic River please see: Charles River Watershed Association Water quality Reports & Data and the Mystic River Watershed Association Mystic Daily Boating Advisory.

Map of Combined Sewer Overflow Locations

To view a full-size version of this map, click here. 

Description of CSO Locations and Potentially Affected Areas

CAM001: Alewife Brook, discharges downstream of Massachusetts Ave Bridge across from Murry Hill Road.

CAM002: Alewife Brook, discharges downstream of Massachusetts Ave Bridge

CAM401A: Alewife Brook, discharges upstream of the confluence with the Little River and upstream of the Route 2 Bridge.

CAM401B: Alewife Brook, discharges upstream of the Massachusetts Ave Bridge.

CAM005: Charles River, discharges downstream of the Eliot Bridge across from Mount Auburn Hospital.

CAM007: Charles River, discharges downstream of the Eliot Bridge across from Hawthorne Street.

CAM009: Charles River, discharges upstream of the Anderson Bridge (temporarily closed).

CAM011: Charles River, discharges upstream of the Weeks Footbridge (temporarily closed).

CAM017: Charles River, discharges downstream of the Longfellow Bridge across from Front Park.

Note: The CSO discharge table below provides details of recent discharges.  Data for CSOs is preliminary and subject to change.  Discharge duration and volume are estimates and are subject to calculation limitations, including meter data reliability, unmonitored downstream conditions such as river level, and MWRA system operations.  See the following links for information on past CSO annual reporting and yearly CSO discharge summaries.  Annual reporting data for each calendar year will be published by April 30 of the following year. Updated/revised data is indicated by ( ).

2025 CSO Activation Table

Event Date CSO Number Outfall Location Potentially Affected Area Start Time Stop Time Duration Volume (million gallons) Event Rainfall (inches) Notice
07.08.2025 CAM401A  Alewife Brook Upstream of the confluence with Little River and upstream of Rt. 2 Bridge 11:24 pm 11:34 pm 10 minutes 0.75 MG (estimated average of last three years) TBD

Alert 1

Alert 2
06.07.2025 CAM401A Alewife Brook
 Upstream of the confluence with Little River and upstream of the Route 2 Bridge  

5:23 pm

(5:30 pm)

6:03 pm

(6 pm)

40 minutes

(30 minutes)

0.75 MG (estimated average of last three years) 

(0.33 MG)

 1.01 Alert 1
05.22.2025 CAM401A Alewife Brook Upstream of the confluence with Little River and upstream of the Route 2 Bridge 

6:38 pm

(7:00 pm)

1:08 am on 05.23.2025

(1:15 am)

 3.25 hours

0.75 MG (estimated average of last three years)

(1.35 MG)

 3.14

Alert 1

Alert 2
05.06.2025 CAM401A  Alewife Brook
 Upstream of the confluence with Little River and upstream of the Route 2 Bridge 

6:13 pm

(6:15 pm)

6:33 pm

(6:30 pm)

20 minutes

(15 minutes)

0.75 MG (estimated average of last three years)

(0.16 MG)

 1.37 Alert 1
04.01.2025 CAM401A Alewife Brook Upstream of the confluence with Little River and upstream of the Route 2 Bridge

12:38 am

(12:45 am)

1:03 am

(1:15 am)

23 minutes

(30 minutes)

0.75 MG (estimated average of last three years)

(0.35 MG)

 0.68

Alert 1

Alert 2
03.17.2025 CAM005 Charles River
 Downstream of the Elliot Bridge across from mount Auburn Hospital

4:13 am

(4:30 am)

4:30 am

(4:45 am)

17 minutes

(15 minutes)

0.12 MG (estimated average of last three years)

(0.01 MG)

 1.37

Alert 1

Alert 2
 03.17.2025 CAM401A Alewife Brook Upstream of the confluence with Little River and upstream of the Route 2 Bridge

3:53 am

(4:00 am)

4:53 am

(4:45 am)

60 minutes

(45 minutes)

0.75 MG (estimated average of last three years)

(1.02 MG)

  1.37

Alert 1

Alert 2
03.06.2025 CAM401A Alewife Brook Upstream of the confluence with Little River and upstream of the Route 2 Bridge

3:22 am

and

3:57 am

(4:14 am)

3:28 am

and

4:38 am

(4:45 am)

47 minutes

(30 minnutes)

0.75 MG (estimated average of last three years)

(0.10 MG)

 1.04

Alert1

Alert2

01.01.2025

(Revised)

 CAM401A Alewife Brook Upstream of the confluence with Little River and upstream of the Route 2 Bridge

3:07 am

(3:15 am)

3:42 am

(3:30 am)

35 minutes

(15 minutes)

0.89 MG (estimated average of last three years)

(0.04 MG)

 0.74 Alert

 

Prior CSO Activations

Event Date CSO Number Outfall Location Potentially Affected Area  Start Time Stop Time  Duration    Volume (million gallons) Event Rainfall (inches) Notice 
12.30.2024 CAM401A Alewife Brook Upstream of the confluence with Little River and upstream of the Route 2 Bridge

8:27 am

(8:30 am)

8:37 am

(8:45 am)

10 minutes

(15 minutes)

0.89 MG (estimated average of last three years)

(0.01 MG)

 0.50" Alert
12.11.2024 CAM401A Alewife Brook Upstream of the confluence with Little River and upstream of the Route 2 Bridge

2:37 pm

(2:45 pm)

4:37 pm

(4:45 pm)

6:25 pm

(6:30 pm)

2:42 pm

(3:00 pm)

5:02 pm

(5:15 pm)

7:07 pm

(7:15 pm)

72 minutes

(1 hour, 30 minutes)

0.89 MG (estimated average of last three years)

(0.56 MG)

 2.19"

Alert 1

Alert 2

08.18.2024

(Revised)

 CAM401A  Alewife Brook  Upstream of the confluence with Little River and upstream of the Route 2 Bridge 

7:52 am

(8:18 am)

8:18 am

(8:28 am)

26 minutes

(10 minutes)

0.89 MG (estimated average of last three years)

(<0.01 MG)

 0.30"  Alert 

08.15.2024

(Revised)

 CAM401A Alewife Brook Upstream of the confluence with Little River and upstream of the Route 2 Bridge

4:38 pm

(4:45 pm)

4:56 pm

(5:15 pm)

18 minutes

(30 Minutes)

0.89 MG (estimated average of last three years)

(0.02 MG)

0.21"

 Alert

08.04.2024

(Revised)

 CAM401A Alewife Brook Upstream of the confluence with Little River and upstream of the Route 2 Bridge

5:08 pm

(5:15 pm)

5:23 pm

(5:45 pm)

15 minutes

(30 minutes)

0.89 MG (estimated average of last three years)

(0.15 MG)

 0.62"

Alert 1 

Alert 2

07.31.2024

(Revised)

 CAM401A Alewife Brook Upstream of the confluence with Little River and upstream of the Route 2 Bridge

11:57 am

(12:00 pm)

12:22 pm

(12:30 pm)

25 minutes

(30 minutes)

0.89 MG (estimated average of last three years)

(0.83 MG)

 0.53" Alert

07.31.2024

(Revised)

<year end update>

CAM005

<year end data update>

 Charles River Downstream of thee Elliot Bridge across from mount Auburn Hospital

11:53 am

(11:45 am)

<12:15 pm>

12:13 pm

(12:15 pm)

<12:30 pm>

20 minutes

(30 minutes)

<15 minutes>

0.21 MG (estimated average of last three years)

(0.01 MG)

<0.03 MG>

 0.53" Alert

06.27.2024

<year end update>

CAM005

(Revised)

<year end data update>

 Charles River Downstream of the Elliot Bridge across from Mount Auburn Hospital

12:22 am

(12:30 am)

<12:30 am>

12:30 am

(2:00 am)

<12:45 am>

8 minutes

(1 hour, 30 Minutes)

<15 minutes>

0.21 MG (estimated average of last three years)

(0.02 MG)

<0.01 MG>

 0.78"

Alert 1

Alert 2
06.27.2024

CAM401A

(Revised)

 Alewife Brook Upstream of the confluence with Little River and upstream of the Route 2 Bridge

12:12 am

(12:15 am)

12:42 am

(12:45 am)

 30 minutes

0.89 MG (estimated average of last three years)

(0.78 MG)

 0.78"

Alert 1

Alert 2
06.20.2024

CAM401A

(Revised)

 Alewife Brook Upstream of the confluence with Little River and upstream of the Route 2 Bridge

9:42 pm

(9:40 pm)

9:55 pm

(10:19 pm)

13 minutes

(39 minutes)

0.89 MG (estimated average of last three years)

(0.16 MG)

0.6"

(0.56")

Alert 1

Alert 2
05.30.2024

CAM401B

(Revised)

(Revised)

 Alewife Brook Upstream of the Massachusetts Ave Bridge

9:17 am

(9:30 am)

10:34 am

(10:30 am)

1 hour, 17 minutes

(1 hour)

0.32 MG (estimated average of last three years)

(0.15 MG)

 1.51" Alert
05.30.2024

CAM401A

(Revised)

 Alewife Brook Upstream of the confluence with the Little River and upstream of the Route 2 Bridge

8:27 am

(8:30 am)

10:57 am

(10:45 am)

2 hours, 30 minutes

(2 hours, 15 minutes)

0.66 MG (estimated average of last three years)

(2.18 MG)

 1.51"

Alert 1

Alert 2
05.27.2024

CAM401A

(Revised)

 Alewife Brook Upstream of the confluence with the Little River and upstream of the Route 2 Bridge

11:22 pm

(NA)

11:32 pm

(NA)

10 minutes

(NA)

0.66 MG (estimated average of last three years)

(0.00)

 0.38"

Alert 1

Alert 2

No Activation
05.08.2024

CAM401A

(Revised)

 Alewife Brook Upstream of the confluence with the Little River and upstream of the Route 2 Bridge

11:37 am

(11:34 am)

12:02 pm

(11:54 am)

25 minutes

(20 minutes)

0.66 MG (estimated average of last three years)

(0.06 MG)

 0.80" Alert

04.12.2024

<year end update>

 CAM401A Alewife Brook Upstream of the confluence with the Little River and upstream of the Route 2 Bridge 8:22 pm 9:18 pm 56 minutes 0.10 MG 1.79" City’s SCADA system had not indicated a spill previously but a spill was identified during review of the final year end data

03.23.2024

<year end update>

 CAM401A Alewife Brook Upstream of the confluence with the Little River and upstream of the Route 2 Bridge 9:03 am 9:23 am 20 minutes 0.02 MG 0.78" City’s SCADA system had not indicated a spill previously but a spill was identified during review of the final year end data
03.07.2024

CAM401A

(Revised)

Alewife Brook

 Upstream of the confluence with the Little River and upstream of the Route 2 Bridge

1:05 am

(2:27 am)

2:36 am

(2:37 am)

1 hour, 31 minutes

(10 minutes)

0.66 MG (estimated average of last three years)

(<0.01 MG)

 1.33"

Alert 1

Alert 2

03.02.2024

<year end update>

CAM005

(Revised)

<year end data update>

 Charles River Downstream of the Eliot Bridge across from Mount Auburn Hospital

11:21 pm

(11:30 pm)

<11:30 pm>

11:51 pm

(1:30 am)

<11:45 pm>

30 minutes

(2 hours)

<15 minutes>

0.28 MG (estimated average of last three years)

(<0.01 MG)

 1.45"

Alert 1

Alert 2

03.02.2024

(03.03.2024)

CAM401A

(Revised)

 Alewife Brook Upstream of the confluence with the Little River and upstream of the Route 2 Bridge

11:05 pm

(12:00 am)

12:22 am

(12:20 am)

1 hour, 17minutes

(20 minutes)

0.66 MG (estimated average of last three years)

(0.05 MG)

 1.45"

Alert 1

Alert 2

01.13.2024

<year end update>

CAM401A 

(Revised)

<year end data update>

 Alewife Brook Upstream of the confluence with the Little River and upstream of the Route 2 Bridge

5:06 am

(5:15 am)

<5:15 am

and

7:30 am>

8:46 am

(6:00 am)

<5:45 am

and

8:45 am>

3 hours, 40 minutes

(45 minutes)

 

 

<1 hour, 45 minutes>

0.66 MG (estimated average of last three years)

(0.02 MG)

<0.70 MG>

 1.23"

Alert 1

Alert 2

 
01.10.2024

CAM007

(Revised)

Charles River

 Downstream of Eliot Bridge across from Hathorne Street

4.05 am

(4:15 am)

4:45 am

(5:00 am)

40 minutes

(45 minutes)

1.04 MG (estimated average of last three years)

(0.13 MG)

 2.42"

Alert 1

Alert 2
01.10.2024

CAM017

(Revised)

 Charles River Downstream of the Longfellow Bridge across from Front Park

3:55 am

5:29 am

(5:20 am)

1 hour, 34 minutes

(1 hour, 25 minutes)

1.90 MG (estimated average of last three years)

(1.04 MG)

 2.42"

Alert 1

Alert 2

01.10.2024

<year end update>

CAM005

(Revised)

<year end data update>

 Charles River Downstream o the Eliot Bridge across from Mount Auburn Hospital

3:51 am

(4:00 am)

5:11 am

(5:15 am)

1 hour, 20 minutes

(1 hour, 15 minutes)

0.28 MG (estimated average of last three years)

((0.16 MG)

<0.94>

 2.42"

Alert 1

Alert 2
01.10.2024

CAM001

(Revised)

 Alewife Brook Downstream of Massachusetts Ave Bridge across from Murray Hill Road

3:50 am

(NA)

4:41 am

(NA)

51 minutes

(NA)

0.05 MG (estimated average of last three years)

(0.00)

 2.26"

Alert 1

Alert 2

(No Activation)
01.10.2024

CAM401B

(Revised)

 Alewife Brook Upstream of the Massachusetts Ave Bridge

3:36 am

(3:45 am)

7:29 am

(7:15 am)

3 hours, 53 minutes

3 hours, 30 minutes)

0.32 MG (estimated average of last three years)

(0.90 MG)

 2.26"

Alert 1

Alert 2
01.10.2024

CAM401A

(Revised)

 Alewife Brook Upstream of the confluence with the Little River and upstream of the Route 2 Bridge

12:46 am

(2:30 am)

6:11 am

(6:00 am)

5 hours, 25 minutes

(3 hours, 30 minutes)

0.66 MG (estimated average of last three years)

(7.81 MG)

 2.26"

Alert 1

Alert 2

12.18.2023

(Revised)

CAM005

(Revised0

 Charles River Downstream of the Eliot Bridge across from Mount Auburn Hospital

12:41 pm

(12:40 pm)

12:54 pm

(1:06 pm)

13 minutes

(20 minutes)

0.28 MG (estimated average of last three years)

(0.06 MG)

 2.50" Alert

12.18.2023

(Revised)

CAM017

9revised)

 Charles River Downstream of the Longfellow Bridge across from Front Park

12:36 pm

(12:35 pm)

12:54 pm

(12:50 pm)

18 minutes

(15 minutes)

1.9 MG (estimated average of last three years)

(0.03 MG)

2.50"

 Alert

12.18.2023

(Revised)

CAM401B

(Revised)

 Alewife Brook Upstream of the Massachusetts Ave Bridge

12:30 pm

(12:45 pm)

1:07 pm

(1:15 pm)

37 minutes

(30 minutes)

0.32 MG (estimated average of last three years)

(0.04 MG)

 2.50" Alert

12.18.2023

(Revised)

CAM401A

(Revised)

 Alewife Brook Upstream of the confluence with the Little River and upstream of the Route 2 Bridge

12:21 pm

(12:30 pm)

1:16 pm

(1:45 pm)

55 minutes

(1 hour, 15 minutes)

0.66 MG (estimated average of last three years)

(1.62 MG)

 2.50"  Alert

12.11.2023

(Revised)

 CAM017 Charles River Downstream of the Longfellow Bridge across from front Park

3:20 am

(NA)

3:30 am

(NA)

10 minutes

(NA)

1.9 MG (estimated average of last three years)

(0.00)

 2.46"

Alert

(No Activation)

12.11.2023

(Revised)

 CAM005 Charles River Downstream of the Eliot Bridge across from Mount Auburn Hospital

3:06 am

(3:15 am)

4:13 am

(3:45 am)

1 hour, 17 minutes

(30 minutes)

0.28 MG (estimated average of last three years)

(0.01 MG)

 2.46" Alert

12.11.2023

(Revised)

 CAM401B Alewife Brook Upstream of the Massachusetts Ave Bridge

3:06 am

(3:15 am)

3:42 am

(3:45 am)

36 minutes

(30 minutes)

0.32 MG (estimated average of last three years)

(0.02 MG)

 2.46" Alert

12.11.2023

(Revised)

 CAAM401A Alewife Brook Upstream of the confluence with the Little River and upstream of the Route 2 Bridge

2:41 am

(2:45 am)

5:36 am

(5:45 am)

2 hours, 55 minutes

(3 hours)

0.66 MG (estimated average of last three years)

(2.56 MG)

 2.46" Alert

09.18.2023

(Rev)

CAM401A

(Reactivation)

 Alewife Brook Upstream of the confluence with the Little River and upstream of the Route 2 Bridge

10:50 pm

(11:00 pm)

11:05 pm 

(11:15 pm)

15 minutes

[Total CSO spill  time 1 hour, 45 minutes including reactivation. Reactivations that occur within 12 hours of initial activation are considered the same event. This event will be reported as a 3 hour event to DEP: beginning of first activation (8:15 pm) and ending time of reactivation (11:15 pm)]

0.66 MG (estimated average of last three years)

(0.57 MG for both activations)

 2.77" Alert

09.18.2023

(Rev)

 CAM401B  Alewife Brook Upstream of the Massachusetts Ave Bridge 

8:36 pm

(8:45 pm)

9:13 pm 

(9:15 pm)

37 minutes

(30 minutes)

0.32 MG (estimated average of last three years) 

(0.03 MG)

 2.77" Alert

09.18.2023

(Rev)

 CAM005 Charles River Downstream of the Eliot Bridge across from Mount Auburn Hospital

8:20 pm

(8:30 pm)

9:03 pm 

(9:15 pm)

43 minutes

(45 minutes)

0.28 MG (estimated average of last three years)

(0.01 MG)

 2.77" Alert

09.18.2023

(Rev)

 CAM401A Alewife Brook  Upstream of the confluence with the Little River and upstream of the Route 2 Bridge 

8:10 pm

(8:15 pm)

9:30 pm 

(9:45 pm)

1 hour, 20 minutes 

(1 hour, 30 minutes)

0.66 MG  (estimated average of last three years)

(see reactivation summary)

 2.77" Alert

09.13.2023

(Rev)

 CAM401A Alewife Brook  Upstream of the confluence with the Little River and upstream of the Route 2 Bridge 

1:35 pm

(1:45 pm)

2:00 pm

(2:15 pm)

25 minutes

(30 minutes)

0.66 MG (estimated average of last three years)

(0.14 MG)

 1.52"  Alert

08.30.2023

(rev)

 CAM401A Alewife Brook Upstream of the confluence with the Little River and upstream of the Route 2 Bridge

9:35 am

(9:45 am)

9:55 am

(10:15 am)

20 minutes

(30 minutes)

0.66 MG (estimated average of last three years)

(0.09 MG)

 0.71" Alert

08.25.2023

(Rev)

 CAM401B  Alewife Brook  Upstream of the Massachusetts Ave Bridge

9:56 am

(10:00 am)

10:20 am

(10:30 am)

24 minutes 

(30 minutes)

0.28 MG (estimated average of last three years) 

(<0.01 MG)

 2.46" Alert

08.25.2023

(Rev)

 CAM005 Charles River Downstream of the Eliot Bridge across from Mount Auburn Hospital 

9:05 am

(9:00 am)

11:33 am

(10:15 am)

2 hours, 28 minutes

(1 hour, 15 minutes)

0,28 MG (estimated average of last three years)

(0.01 MG)

 2.46" Alert

08.25.2023

(Rev)

 CAM401A Alewife Brook  Upstream of the confluence with the Little River and upstream of the Route 2 Bridge 

8:50 am

(9:00 am)

1:10 pm 

(11:00 am)

4 hours, 20 minutes 

(2 hours)

0,66 MG (estimated average of last three years) 

(0.58 MG)

 2.46" Alert

08.21.2023

(Rev)

 CAM401A Alewife Brook Upstream of the confluence with the Little River and upstream of the Route 2 Bridge

8:40 pm

(8:45 pm)

8:50 pm

(9:00 pm)

10 minutes

(15 minutes)

0.66 MG (estimated average of last three years)

(0.03 MG)

 0.43" Alert

08.18.2023

(Rev)

 CAM401A Alewife Brook Upstream of the confluence with the Little River and upstream of the Route 2 Bridge

4:20 pm

(4:30 pm)

4:30 pm

(4:45 pm)

10 minutes

(15 minutes)

0.66 MG (estimated average of last three years)

(0.02 MG)

 0.62" Alert

08.08.2023

(rev)

 CAM007 Charles River Downstream of the Eliot Bridge across from Hawthorne Street

11:05 am

(11:15 am)

12:21 pm

(1:00 pm)

1 hour, 16 minutes

(1 hour, 45 minutes)

1.04 (estimated average of last three years)

(0.92 MG)

 2.53" Alert

08.08.2023

(Rev)

 CAM005 Charles River Downstream of the Eliot Bridge across from Mount Auburn Hospital

10:51 am

(11:00 am)

12:20 pm

(11:53 am)

1 hour, 29 minutes

(53 minutes)

0.28 MG (estimated average of last three years)

(0.63 MG)

 2.53" Alert

08.08.2023

(Rev)

 CAM001 Alewife Brook Downstream of Massachusetts Ave Bridge across from Murry Hill Road

11:05 am

(11:15 am)

11:41 am

(11:45 am)

36 minutes

(30 minutes)

0.05 MG (estimated average of last three years)

(<0.01 MG)

 2.53" Alert

08.08.2023

(Rev)

 CAM401B Alewife Brook Upstream of the Massachusetts Ave Bridge

10:51 am

(11:00 am)

12:27 pm

(12:30 pm)

1 hour, 36 minutes

(1 hour, 30 minutes)

0.32 MG  (estimated average of last three years)

(0.53 MG)

 2.53" Alert
08.08.2023 (Rev) CAM401A Alewife Brook Upstream of the confluence with the Little River and upstream of the Route 2 Bridge

10:36 am

(10:45 am)

12:34 pm

(12:45 pm)

1 hour, 58 minutes 

(2 hours)

0.66 MG (estimated average of last three years)

(3.55 MG)

 2.53" Alert
07.29.2023 CAM017 Charles River Downstream of the Longfellow Bridge across from front Park 5:10 pm 5:40 pm 30 minutes 0.35 MG (estimated average of last three years) 2.37" Not issued

07.29.2023

(Rev)

 CAM005 Charles River Downstream of the Eliot Bridge across from Mount Auburn Hospital

6:19 pm

(NA)

8:53 pm

(NA)

2 hours, 34 minutes

(NA)

0.28 MG (estimated average of last three years)

(NA)

 2.37"

Alert

(Retraction)

07.29.2023

(Rev)

 CAM401A Alewife Brook Upstream of the confluence with the Little River and upstream of the Route 2 Bridge

6:09 pm

(5:30 pm)

9:14 pm

(9:15 pm)

3 hours, 5 minutes

(3 hours, 45 minutes)

0.66 MG (estimated average of last three years)

(2.0 MG)

 2.37" Alert

07.25.2023

(Rev)

 CAM401A  Alewife Brook Upstream of the confluence with the Little River and upstream of the Route 2 Bridge 3:30 pm

3:40 pm

(3:45 pm)

10 minutes

(15 minutes)

0.66 MG (estimated average of last three years)

((0.31 MG)

 0.42" Alert

07.21.2023

(Rev)

 CAM401B Alewife Brook Upstream of the  Massachusetts Ave Bridge

9:25 pm

(9:30 pm)

10:01 pm

(10:00 pm)

36 minutes

(30 minutes)

0.32 MG (estimated average of last three years)

(0.08 MG)

 1.68" Alert

07.21.2023

(Rev)

 CAM007 Charles River Downstream of the Eliot Bridge across from Hawthorne Street

9:20 pm

(9:30 pm)

10:05 pm

(10:15 pm)

 45 minutes

1.05 MG (estimated average of last three years)

(0.33 MG)

 1.68" Alert

07.21.2023

(Rev)

 CAM401A  Alewife  Brook Upstream of the confluence with the Little River and upstream of the Route 2 Bridge

9:20 pm

(9:30 pm)

11:00 pm

(11:15 pm)

1 hour,  40 minutes

(1 hour, 45 minutes)

0.66 MG (estimated average of last three years)

(3.05 MG)

 1.68" Alert

07.21.2023

(Rev)

 CAM005 Charles River Downstream of the Eliot Bridge across from Mount Auburn Hospital

9:20 pm

(9:13 pm)

10:40 pm

(9:58 pm)

1 hour,  20 minutes

(45 minutes)

0.28 MG (estimated  average of last three years)

(0.60 MG)

 1.68" Alert

07.21.2023

(Rev)

 CAM017  Charles River Downstream of the Longfellow Bridge across from Front Park

8:25 pm

(8:30 pm)

 10:10 pm

1 hour, 45 minutes 

(1 hour, 40 minutes)

1.90 MG (estimated average of last three years)

(1.38 MG)

 1.68" Alert

07.16.2023

(Rev)

 CAM401A Alewife Brook Upstream of the confluence with the Little River and upstream of the Route 2 Bridge

12:10 pm

(12:15 pm)

12:20 pm

(12:30 pm)

10  minutes

(15 minutes)

0.66 MG (estimated average of last three years)

(0.04 MG)

 1.97" Alert

07.10.2023

(Rev)

 CAM401B Alewife Brook Upstream of the Massachusetts Ave Bridge

2:30 pm

(2:45 pm)

 3:00 pm

30 minutes

(15 minutes)

0.32 MG (estimated average of last three years)

(0.02 MG)

 1.06" Alert

07.10.2023

(Rev)

 CAM401A Alewife Brook Upstream of the confluence of the Little River and upstream of the Route 2 Bridge

2:10 pm

(2:15 pm)

3:11 pm

(3:00 pm)

61minutes

(45 minutes)

0.66 MG (estimated average of  last three years)

(0.67 MG)

 1.06" Alert

07.10.2023

(Rev)

 CAM005 Charles River Downstream of the Elliot Bridge across from Mount Auburn Hospital 2:20 pm

2:50 pm

(2:30 pm)

30 minutes

(10 minutes)

0.28 MG (estimated average of last three years)

(0.01)

 1.06" Alert

07.03.2023

(Rev)

 CAM401B Alewife brook Upstream of the Massachusetts Ave Bridge

2:01 am

(2:15 am)

2:23 am

(2:30 am

22 minutes

(15 minutes)

0.32 MG (estimated average of last three years)

(<0.01 MG)

 1.28" Alert

07.03.2023

(Rev)

 CAM005 Charles River  Downstream of the Eliot Bridge across from mount Auburn hospital 

1:50 am

(1:45 am)

2:12 am 

(1:55 am)

22 minutes 

(10 minutes)

0.28 MG (estimated average of last three years) 

(0.04 MG)

 1.28" Alert

07.03.2023

(Rev)

 CAM401A Alewife Brook  Upstream of the confluence of the Little River and upstream of the Route 2 bridge 

1:36 am

(1:45 am)

3:01 am

(3:00 am)

1 hour, 25 minutes

(1 hour, 15 minutes)

 0.66 MG (estimated average of last three years)

(0.69 MG)

 1.28" Alert

05.20.2023

(Rev)

 CAM001 Alewife Brook Downstream of Massachusetts Ave Bridge across from Murry Hill Road

11:50 pm

(NA)

1:58 am

(NA)

2 hours, 8 minutes

(NA)

0.05 MG (estimated average of last three years)

(0.00)

 2.27

Alert

(No activation)

05.20.2023

(Rev)

 CAM401B  Alewife Brook  Upstream of the Massachusetts Ave Bridge

11:37 pm

(11:45 pm)

1:32 am 

(1:30 am)

1 hour, 55 minutes 

(1 hour, 45 minutes)

0.32 MG (estimated average of last three years) 

(0.27 MG)

 2.27 Alert

05.20.2023

(Rev)

 CAM005 Charles River Downstream of the Eliot Bridge across from Mount Auburn Hospital

11:36 pm

(11:45 pm)

12:51 am

(1:45 am)

1 hour, 15 minutes 

(2 hours)

0.28 MG (estimated average of last three years) 

(0.04 MG)

 2.27 Alert 

05.20.2023

(Rev)

 CAM401A Alewife Brook Upstream of the confluence with the Little river and upstream of the Route 2 Bridge

11:20 pm

(11:33 pm)

1:47 am

(2:10 am)

2 hours, 27 minutes

(2 hours, 37 minutes)

0.66 MG (estimated average of last three years)

(1.77 MG - modeled)

 2.27 Alert

05.01.2023

(Rev)

 CAM401A  Alewife Brook  Upstream of the confluence with the Little River and Upstream of the Route 2 Bridge 

12:51 am

(1:00 am)

1:15 am 

(1:30 am)

24 minutes 

(30 minutes)

0.66 MG (estimates average of last three years) 

(0.05 MG)

 1.52"  Alert 

03.14.2023

(Rev)

 CAM401A Alewife brook Upstream of the confluence with the Little River and Upstream of the route 2 Bridge

7:11 am

(9:00 am)

12:46 pm

(12:30 pm)

5 hours, 35 minutes

3 hours, 30 minutes)

0.66 MG (estimated average of last three years)

(0.42 MG)

 2.5" Alert
03.14.2023 CAM007 Charles River Downstream of the Eliot Bridge across from Hawthorne Street NA NA NA NA 2.5"

Retraction

Alert
03.02.2023 CAM401A Alewife Brook Upstream of the confluence with the Little River and upstream of the Route 2 Bridge NA NA NA NA 0.70"

Retraction

Alert

01.26.2023

(Rev)

 CAM401A Alewife Brook Upstream of the confluence with the Little River and upstream of the Route 2 Bridge

2:05 am

(2:15 am)

 4:15 am

2 hours, 10 minutes

(2 hours)

0.78 MG (estimated average of last three years)

(0.09 MG)

 1.08" Alert

12.23.2022

(Rev)

 CAM401A Alewife Brook Upstream of the confluence with the Little River and upstream of the Route 2 Bridge

12:55 am

(12:59 am)

1:36 am

(1:19 am)

41 minutes

(20 minutes)

0.78 MG (estimated average of last three years)

(< 0.01 MG)

1.85"

(1.73")

 Alert

11.30.2022

(Rev)

 CAM401A  Alewife Brook Upstream of the confluence with the Little River and upstream of the Route 2 Bridge

7:20 pm

(7:19 pm)

7:36 pm

(7:39 pm)

16 minutes

(20 minutes)

0.78 MG (estimated average of last three years)

(0.09MG)

0.73

(0.82")

 Alert
11.16.2022 CAM401A  Alewife Brook  Upstream of the confluence with the Little River and upstream of the Route 2 Bridge  (7:11 am) (7:41 am)  30 minutes  (<0.01 MG)  (0.94")

 

Not issued
10.18.2022 CAM401A  Alewife Brook  Upstream of the confluence with the Little River and upstream of the Route 2 Bridge  (2:25 am) (2:35 am) (10 minutes) (<0.01 MG)  (0.35")  Not issued 

10.14.2022

(Rev)

 CAM005  Charles River

Downstream of the Eliot Bridge, across from Munt Auburn Hospital

9:10 am

(9:15 am)

10:55 am

(9:30 am)

105 minutes

(15 minutes)

0.40 MG (estimated average of last three years)

(0.03 MG)

 1.83" Alert

10.14.2022

(Rev)

 CAM401A  Alewife Brook Upstream of the confluence with the Little River and upstream of the Route 2 Bridge

9:05 am

(9:22 am)

10:05 am

(9:52 am)

60 minutes

(30 minutes)

0.78 (estimated average of last three years)

(0.19 MG)

1.83" 

(1.70")

 Alert
09.19.2022 CAM401A  Alewife Brook  Upstream of the confluence with the Little River and upstream of the Route 2 Bridge  (9:35 pm) (9:45 pm)  (10 minutes) (0.01 MG) (0.29") Not issued

08.26.2022

(Rev)

 CAM401A Alewife Brook Upstream of the confluence with the Little River and upstream of the Route 2 Bridge

4:40 pm

(4:37 pm)

4:55 pm

(4:57 pm)

15 minutes

(20 minutes)

0.78 (estimated average of last three years)

(0.12 MG)

0.50"

 Alert

08.26.2022

(Rev)

 CAM005 Charles River Downstream of the Eliot Bridge, across from Mount Auburn Hospital (4:45 pm) (5:00 pm) (15 minutes) (0.01 MG) 0.50" Not issued
08.05.2022 CAM401A  Alewife Brook  Upstream of the confluence with the Little River and upstream of the Route 2 Bridge  (4:44 pm) (4:54 pm) (10 minutes)  (<0.01 MG)  (0.10") Not issued

06.27.2022

(Rev)

 CAM005  Charles River  Downstream of the Eliot Bridge, across from Mount Auburn Hospital 

2:05 pm

(2:00 pm)

 2:15 pm 15 minutes 0.01 0.79" Alert
04.19.2022 CAM005  Charles River  Downstream of the Eliot Bridge, across from Mount Auburn Hospital

4:35 am

(4:00 am rev)

 6:00 am 120 minutes 0.11 1.02"  
02.04.2022 CAM401A Alewife Brook Upstream of the confluence with the Little River and upstream of the Route 2 Bridge (7:23 am) (7:33 am)  10 minutes)  (<0.01)  (1.33")  
01.17.2022 CAM401A  Alewife Brook Upstream of the confluence with the Little River and upstream of the Route 2 Bridge 

7:40 am - No activation

(7:49 am)

No Spill 

(7:59 am)

No Spill

(10 minutes)

No Spill 

(<0.01)

 0.98"   
11.12.2021 CAM401A Alewife Brook Upstream of the confluence with the Little River and upstream of the Route 2 Bridge 4:05 pm 4:50 pm 45 minutes 0.06 1.07"  
10.30.2021 CAM401B Alewife Brook Upstream of the Mass Ave Bridge 7:24 pm 7:39 pm 15 minutes  < 0.001 1.63"  
10.30.2021  CAM005 Charles River Downstream of the Eliot Bridge, across from Mount Auburn Hospital 7:20 pm 7:50 pm 30 minutes 0.02 1.63"  
10.30.2021 CAM001 Alewife Brook Downstream of the Massachusetts Ave Bridge across from Murray Hill Road 7:17 pm 7:22 pm 5 minutes < 0.001 1.63"  
10.30.2021 CAM401A Alewife Brook Upstream of the confluence with the Little River and upstream of the Route 2 Bridge 7:05 pm

8:20 pm

 75 minutes 0.23 1.63"  
10.26.2021 CAM401B  Alewife Brook  Upstream of the Mass Ave Bridge  7:09 am  7:39 am 30 minutes  0.27 1.43"  
10.26.2021 CAM001 Alewife Brook  Downstream of the Massachusetts Ave Bridge across from Murray Hill Road 7:02 am 7:17 am  15 minutes  0.01  1.43"   
10.26.2021 CAM017  Charles River  Downstream of the Longfellow Bridge, across from Front Park  6:05 am  6:35 am  30 minutes  0.54  1.43"   
10.26.2021 CAM401A  Alewife Brook Upstream of the confluence with the Little River and upstream of the Route 2 Bridge  6:35 am 8:05 am  90 minutes  0.70  1.43"   
10.05.2021 CAM001 Alewife Brook Downstream of the Massachusetts Ave Bridge across from Murry Hill Road

2:45 am - No Activation

 No Spill No Spill No Spill 1.64"  
10.05.2021 CAM401A Alewife Brook Upstream of the confluence with the Little River and upstream of the Route 2 Bridge

12:50 am - No Activation

 No Spill No Spill No Spill 1.64"  
09.28.2021 CAM005  Charles River  Downstream of the Eliot Bridge, across from Mount Auburn Hospital 

11:40 am

(11:45 am)

 8:00 pm 495 minutes 0.28 1.60"  
09.28.2021 CAM401A  Alewife Brook Upstream of the confluence with the Little River and upstream of the Route 2 Bridge 10:35 am 8:00 pm 565 minutes 1.10 1.60"  
09.10.2021 CAM005  Charles River  Downstream of the Eliot Bridge, across from Mount Auburn Hospital  1:16 am - No Activation No Spill No Spill No Spill 0,96"  
09.10.2021 CAM401A  Alewife Brook  Upstream of the confluence of the Little River and upstream of the Route 2 Bridge  1:04 am 3:29 am 145 minutes 0.10 0.96"  
09.02.2021 CAM007 Charles River Downstream of the Eliot Bridge, across from Hawthorne Street 3:05 am 5:15 am 130 minutes 0.47 4.25"  
09.02.2021 CAM001 Alewife Brook  Downstream of Mass Ave Bridge, across from Murry Hill Road 2:45 am 5:45 am 180 minutes 0.06 4.25"  
09.02.2021 CAM017 Charles River Downstream of the Longfellow Bridge, across from Front Park 1:35 am 5:15 am 220 minutes 4.43 4.25"  
09.02.2021 CAM005 Charles River Downstream of the Eliot Bridge, across from Mount Auburn Hospital 12:07 am 6:00 am 353 minutes 0.29 4.25"  
09.02.2021 CAM401B Alewife Brook Upstream of the Mass Ave Bridge 12:15 am 7:30 am 435 minutes 0.18 4.25"  
09.01.2021 CAM401A Alewife Brook Upstream of the confluence of the Little River and upstream of the Route 2 Bridge 7:00 pm

6:45 am

 705 minutes 2.95 4.25"  
09.01.2021 CAM001 Alewife Brook Downstream of Mass Ave Bridge, across from Murry Hill Road 11:26 pm - no activation see 09.02.2021 see 09.02.2021 see 09.02.2021" 4.25"  
08.22.2021 CAM005 Charles River Downstream of the Eliot Bridge, across from Mount Auburn Hospital 9:25 am 9:40 am 15 minutes 0.02 0.89"  
08.22.2021 CAM401B Alewife Brook Upstream of the Mass Ave Bridge 9:20 am 9:45 am 15 minutes 0.004 0.89"  
08.22.2021 CAM401A Alewife Brook Upstream of the confluence of the Little River and upstream of the Route 2 Bridge 9:05 am 9:45 am 40 minutes 0.29 0.89"  
08.19.2021 CAM007 Charles River Downstream of Eliot Bridge, across from Hawthorne Street  12:35 pm 1:15 pm 40 minutes 0.20 1.72"  
08.19.2021 CAM001 Alewife Brook  Downstream of Mass Ave Bridge, across from Murry Hill Road  12:05 pm  12:50 pm 45 minutes 0.43 1.72"  
08.19.2021 CAM005 Charles River Downstream of the Eliot Bridge, across from Mount Auburn Hospital  12:00 pm 1:15 pm 75 minutes 0.10 1.72"  
08.19.2021 CAM401B Alewife Brook  Upstream of the Mass Ave Bridge  11:45 am  1:30 pm 135 minutes 0.55 1.72"  
08.19.2021 CAM401A Alewife Brook  Upstream of the confluence with the Little River and upstream of the Route 2 Bridge  11:00 am  1:30 pm 150 minutes 1.13 1.72"  
08.19.2021 CAM017 Charles River Downstream of the Longfellow Bridge, across from Front Park  11:00 am  12:30 pm 90 minutes 2.43 1.72"  
07.27.2021  CAM001  Alewife Brook  Downstream of Mass Ave Bridge, across from Murry Hill Road  No Spill No Spill  No Spill No Spill 0.74"  
07.27.2021 CAM005  Charles River Downstream of the Eliot Bridge, across from Mount Auburn Hospital  7:50 pm  8:20 pm 30 minutes  0.04  0.74"  
07.27.2021 CAM401B  Alewife Brook  Upstream of Mass Ave Bridge  7:51 pm 8:20 pm 30 minutes  0.08  0.74"  
07.27.2021 CAM401A  Alewife Brook  Confluence of Little River, upstream of Mass Ave Bridge  7:45 pm 8:15 pm  30 minutes  0.24 0.74"   
07.18.2021 CAM005  Charles River Downstream of the Eliot Bridge, across from Mount Auburn Hospital 5:15 am  5:30 am  15 minutes  0.02  0.34"   
07.18.2021 CAM401A Alewife Brook Confluence of Little River, upstream of Mass Ave Bridge 5:11 am 5:45 am 34 minutes 0.75 0.34"  
07.18.2021 CAM007  Charles River  Downstream of the Eliot Bridge, across from Hawthorne Street 5:00 am  5:30 am  30 minutes  0.24  0.34"   
07.12.2021 CAM005  Charles River Downstream of Eliot Bridge, across from Mount Auburn Hospital 8:30 am 9:00 am  30 minutes  0.02  1.05"   
07.12.2021 CAM401A  Alewife Brook  Confluence of Little River, upstream of Mass Ave Bridge 7:45 am  10:45 am  3 hours  1.72  1.05"   
07.09.2021 CAM401A Alewife Brook Confluence of Little River, upstream of Mass Ave Bridge 12:45 pm 2:13 pm  1.5 hours 0.44 2.53"  
07.09.2021  CAM007  Charles River Downstream of Eliot Bridge across from Hawthorne Street 12:10 pm 1:20 pm 1.2 hours 0.68 2.53"  
07.09.2021 CAM005 Charles River Downstream of Eliot Bridge across from Mount Auburn Hospital 11:30 am 1215 pm 0,75 hours 0.18 2.53"  
07.09.2021 CAM017 Charles River Downstream of Longfellow Bridge, across from Front Park 10:15 am 1:30 pm 3.25 hours 3.31 2.53"  
07.09.2021 CAM401B  Alewife Brook Upstream of Mass Ave Bridge  11:30 am 2:50 pm 3.33 hours 0.57 2.53"  
07.03.2021 CAM401A Alewife Brook  Confluence of Little River, upstream of Mass Ave Bridge  9:37 pm 9:42 pm  5 minutes  0.07  1.39"  
07.03.2021 CAM001 Alewife Brook  Downstream of Mass Ave Bridge, across from Murry Hill Road  Data Unavailable  Data Unavailable Data Unavailable Data Unavailable 1.39"   
07.02.2021 CAM401B

Alewife Brook

 Upstream of Mass Ave Bridge 2:00 am 3:30 am 1.5 hours 0.473  2..23"  
07.02.2021 CAM007  Charles River Downstream of Eliot Bridge  2:08 am 3:20 am 1.2 hours  0.038   2.23"  
07.02.2021 CAM401A  Alewife Brook  Confluence of Little River, Upstream of Mass Ave Bridge  1:29 am 3:30 am 2.0 hours 0.81  2.23"  
07.02.2021 CAM001  Alewife Brook Downstream of Mass Ave Bridge, across from Murry Hill Road Data Unavailable Data Unavailable Data Unavailable Data Unavailable  2.23"  
07.02.2021 CAM005  Charles River Downstream of Elliot Bridge, across from Mount Auburn Hospital 2:15 am 3:52 am  1.62 hours  2.27   2.23"  
07.02.2021 CAM017 Charles River Downstream of Longfellow Bridge, across from Front Park 12:30 am 2:30 am 2.0 hours 2.91  2.23"  
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