Lake Massapoag is a 392-acre, natural, stream and spring-fed lake, and one of the Town of Sharon's most valuable natural resources. The name Massapoag is Algonquin, meaning "large water". The lake is the headwaters of the Massapoag Brook, which flows from the north end of the lake at the flume house, through Hammer Shop Pond, Mann's Pond, then Trowel Shop Pond and eventually into the Neponset River.
The Lake Massapoag website is sponsored by the Lake Massapoag Advisory Committee (LMAC). On these pages you will find up to date information on lake status and test results for E. coli, cyanobacteria, and nutrients, how you can protect the lake from excess nutrient influx that feeds cyanobacteria and E. coli, and links to lake-related events and recreational opportunities.
Lake Massapoag's Memorial Beach and other swimming beaches had good water quality in 2022, with the exception of Community Center Beach. This Dashboard shows the progress we are making in identifying hot spots for E. coli and phosphorus, which will help inform future recommendations for source reduction, plans for mitigation, and infrastructure projects to improve lake health.
Lake Massapoag is a Great Pond, by state definition, and thus overseen by the Select Board. It is managed under the orders of conditions set by the Town of Sharon Conservation Commission. The LMAC provides recommendations to the Conservation Commission on matters pertaining to lake management.