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Halifax Town Hall, 499 Plymouth Street, Halifax, MA 02338 • Phone/Hours
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Monponsett Pond and Mosquitoes
Current Monponsett Pond Information

The Massachusetts Department of Environmental Protection has begun its testing of West and East Monponsett Pond for 2017.

Data for 2015 and 2016 can be reviewed.

Because of the test results from May 1, West Monponsett Pond and East Monponsett Pond are open for swimming and other recreational uses in which contact with the water is probable. Test results below 70,000 cells per milliliter for two consecutive weeks are required for the Ponds to be open.

The following table shows algae counts for the spring, summer and fall of 2017. A count of under 70,000 cells/ml (milliliter) is good. If there is a week in which the count goes above 70,000, it requires two consecutive counts of under 70,000 to lift the advisory on not swimming, boating, etc. At this time, West Monponsett and East Monponsett are tested once a week.

Pond status
May 1, 2017
4th Avenue beach - West Monponsett
clean result
May 1, 2017
State Boat Ramp/Route 58 - West Monponsett
clean result
May 1, 2017
Route 36 Boat Ramp - East Monponsett Pond
clean result
May 8, 2017
4th Avenue beach - West Monponsett
clean result
May 8, 2017
State Boat Ramp/Route 58 - West Monponsett
clean result
May 8, 2017
State Boat Ramp/Route 58 - West Monponsett
clean result

Current Mosquito Information

Latest Mosquito Information (November 4, 2016)

As of November 4, Halifax is listed as a "low risk" community for EEE and WnV. The Halifax Board of Health has been notified about a mosquito with EEE (Eastern Equine Encephalitis) in Middleborough (July 12),one in Kingston (August 15) and one in West Bridgewater (August 23). It was found in a Culex mosquito, the Culex restuans. Natural and artificial containers are the preferred larval habitat of this mosquito. It feeds almost primarily on birds but has been known to bite humans on occasion. This species is typically collected from May to October but can be found year round as it readily overwinters in man-made structures. Cx restuans has been implicated as a vector of WNV. Take this bird biter as a warning. People have control over stagnant water in containers: buckets, tarps, tires, etc. Rinse them out, turn them over. Rinse bird baths at least twice a week.

Residents should continue to take precautions including removing all containers with standing water such as accumulating junk in the yard, not maintaining swimming pools and allowing them to sit with green stagnant water, along with toys, tarps and tires.

The Massachusetts Department of Public Health wrote:

Although there has been less evidence of EEE activity this year than in some recent years, the late heat and humidity this summer are perfect conditions for mosquito activity. The peak time for transmission of EEE will continue through at least some of September. The types of mosquitoes most likely to carry EEE are considered to be active dusk to dawn but the timing of that activity can be impacted by temperature, humidity, cloud cover and day length. In addition, active participation in outdoor sports increases our availability to mosquitoes. Physical exertion and sweating may also change individual attractiveness to mosquitoes and may decrease the time that repellents are effective.

DPH is writing to ask you to help us get the word out to residents, schools and athletic groups, that it is important to take steps to avoid mosquito bites. Know the drill – mosquito repellents, clothing and limiting outdoor activity during peak mosquito activity hours. In case they are useful, the DPH wants to remind you of the short PSA videos that it has available online for you to download and use (or link to). They are available at

Also, keep in mind that our residents travel between cities and towns regularly and some of those may travel from areas not familiar with EEE.  They may not be mindful of the importance of preventing mosquito bites.  Please remind them.

To call for ground spraying of your property, call Plymouth County Mosquito Control at 781 585 5450

Individuals can call the Project, between 8:00am and 3:00pm on Monday through Friday, to request that their property be sprayed. The Project’s phone number is (781) 585-5450, fax (781) 582-1276 or mail us at P.O. Box 72, Kingston, MA 02364. To find out where the spray routes are going to be call (617) 582-6219 (during spray season). Plymouth County Mosquito Control Project

For more information on EEE and WNv, please see DPH's site at:

Monponsett Pond - Frequently Asked Questions

What is the enabling legislation that allows the City of Brockton to divert water from Monponsett Pond?

There was legislation approved in 1893, 1896 and 1899 concerning Silver Lake and in 1885 concerning water resources in Rockland, Abington and "South Abington".

The Massachusetts State Legislature approved the enabling legislation in 1964. This was modified in 1981. The MA Department of Environmental Protection modified this slightly to allow for diversion to Silver Lake during the summer months under certain conditions.

The MA Department of Public Works approved a license for the diversion infrastructure in 1965.

Who do I contact to hold a fishing tournament, a boat contest or a similar event on Monponsett Pond?

Contact the Commonwealth of Massachusetts. Permit forms can be downloaded or you can contact David Diotalevi, Access Program Coordinator, 53 Groton Shirley Road, Ayer, MA 01432. Tel. 978-772-4658; Fax. 978-772-9824; Email 

How can I obtain a copy of the presentation made by Lycott Environmental in early 2013 concerning algae remediation?

A copy of the presentation is available on the Town's web site.

What studies are available about the natural and manmade water flows in the area?

The Division of Marine Fisheries published a report on the Forge Pond Dam, which is between Silver Lake and the Jones River in 2013. While not specific to Monponsett Pond, because Brockton is allowed to divert water from Monponsett Pond to Silver Lake, Monponsett Pond is mentioned a number of times. The Sustainable Water Management Initiative report concerning Silver Lake, Monponsett Pond and Stump Brook was completed in the summer of 2013.

What records are available for water flows to and from Monponsett Pond?

Diversion data for Monponsett Pond and other bodies of water (1996-2013) - Excel workbook
"[Link]Legend" for columns in the Excel workbook
Flows through the fish ladder at the Brockton Dam on Stump Brook (2013) - Text file

What examples exist of work being done on similar ponds in Massachusetts?

The White Island Pond (a pond in Wareham and Plymouth) Conservation Alliance has issued its brochure for 2013. It contains advice how how residents and others can lower the amounts of phosphorous going into White Island Pond along with a progress report of the work begin done. In addition, the Massachusetts Bureau of Resource Protection (part of DEP) issued a report (2010) on the Final Total Maximum Daily Load of Total Phosphorous for the pond, establishing a benchmark.

How much water can be diverted on a daily basis from Monponsett Pond to Silver Lake? How much water could be diverted downstream via Stump Brook?

According to Princeton-Hydro, the Silver Lake Diversion Pipe can divert a maximum of 40 cubic feet per second (cfs) or 25.8 million gallons per day (MGD).

The maximum amount of water that can be sent downstream using the fish ladder at the Brockton Dam on Stump Brook is 15 cfs or 9.7 MGD.

If the water level at the Brockton Dam is six inches above the height of the dam, then 80 cfs or 51.7 MGD will go over the dam.

If the water level at the Brockton Dam is one foot above the height of the dam, then 200 cfs or 129.3 MGD will go over the dam.

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