Sherman Reservoir
Franklin County, Massachusetts218 acresView mapDirections
No nutrient or algae sampling on record from MassDEP for this lake.
- Impaired · Mercury
- 45 ft max depth
- Limited data
Sherman Reservoir in Franklin County, Massachusetts has water-quality measurements published by MassDEP, shown here as reported. Surface area: 218 acres.
Sherman Reservoir is a 218-acre lake in Franklin County, Massachusetts with an estimated average depth of about 45 feet.
Source: EPA Water Quality Portal sampling records, MassDEP, last sampled 2016-04-18. Methodology: how these readings are compared.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Sherman Reservoir is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.
Whether Sherman Reservoir is safe to swim in today is a call for the Massachusetts Department of Environmental Protection and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Sherman Reservoir
These are the measurements MassDEP publishes for Sherman Reservoir, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data.
Ask about Sherman Reservoir
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
~45 ft est.
Surface area
218 acres
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Massachusetts has not published bathymetry for Sherman Reservoir.
Lake Size & Watershed
Watershed (drainage) area
231 sq mi
HydroLAKES / HydroSHEDS
Shoreline
3.8 mi
HydroLAKES / HydroSHEDS
Elevation
1,112 ft
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
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Fishing Sherman Reservoir
Reservoir Info (USACE NID)
Sherman Reservoir is a man-made reservoir impounded by the Sherman (completed 1927), built primarily for hydroelectric on the Deerfield River; other-type dam, 110 ft tall and 989 ft long.
- Surface area
- 218 ac
- Normal storage
- 5,480 ac-ft
- Max storage
- 5,480 ac-ft
- Drainage area
- 236 sq mi
- Hazard class
- High
- Owner
- Great River Hydro, LLC
All listed purposes: Hydroelectric;Recreation.
Source: USACE National Inventory of Dams, NID ID MA00043 · Operator website
EPA Impairment Status
Sherman Reservoir is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
Designated uses not supporting: Fish consumption.
Source: EPA ATTAINS assessment unit MA33018 · Official waterbody report
Nearby Lakes in Franklin County
Frequently asked questions about Sherman Reservoir
Where is Sherman Reservoir?
- Sherman Reservoir is a lake in Franklin County, Massachusetts. Its water-quality measurements are published by MassDEP and shown on this page as reported.
What is the water quality of Sherman Reservoir?
- Sherman Reservoir in Franklin County, Massachusetts has water-quality measurements published by MassDEP, shown here as reported. Surface area: 218 acres.
Is Sherman Reservoir safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Sherman Reservoir is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.
How deep is Sherman Reservoir?
- No published bathymetric survey covers Sherman Reservoir, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 45 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate. The lake covers 218 acres.
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Where this data comes from
22 measurements from 1 monitoring station, 2016. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Vermont Dept of Environmental Conservation
1VTDECWQ22 samples · 2016
Analytical methods
- 4500 P H ~ Manual Digestion and Flow Injection Analysis for Total Phosphorus
Monitoring station identifiers (1)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database
Lake size & watershed from HydroLAKES (HydroSHEDS)