Sherman Reservoir
Franklin County, Massachusetts218 acresView mapDirections
Not enough samples to grade — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). No letter yet. Here is what we do have.
- Impaired · Mercury
- 45 ft max depth
- Limited data
Sherman Reservoir in Franklin County, Massachusetts is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 218 acres.
- Max depth
- ~45 ft est.
- Area
- 218 acres
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Watch Sherman Reservoir’s letter
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Why Sherman Reservoir has no grade
We grade a lake only when the monitoring record supports a letter: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Sherman Reservoir, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years).
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by MassDEP and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
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. Grade methodology: LakeQuality methodology.
Swimming Safety
Not ratedLimited data
The letter is 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.
Water quality measurements for Sherman Reservoir
These readings exist but are not enough for an A–F grade — see why.
No clarity data.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples |
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~45 ft est. |
| Average Depth | ~28 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
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.
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
Source: EPA ATTAINS assessment unit MA33018 · Official waterbody report
Graded lakes near Sherman Reservoir
Sherman Reservoir has no grade, but these lakes within a short drive do.
Nearby Lakes in Franklin County
Frequently asked questions about Sherman Reservoir
Where is Sherman Reservoir?
- Sherman Reservoir is a lake in Franklin County, Massachusetts. LakeQuality has not rated this lake (UNRATED) — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years).
What is the water quality grade for Sherman Reservoir?
- Sherman Reservoir in Franklin County, Massachusetts is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 218 acres.
Is Sherman Reservoir safe to swim in?
- The letter is 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.
Explore Sherman Reservoir across LakeQuality
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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)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database
Lake size & watershed from HydroLAKES (HydroSHEDS)