Mollys Falls Reservoir
Washington County, Vermont411 acresView mapDirections
Not Rated: one monitoring station are on record, but they measured water clarity only. LakeQuality’s A–F method grades total phosphorus, total nitrogen, chlorophyll-a, and turbidity; clarity is shown, not scored.
- 52 ft max depth
- Public access
- Limited data
Mollys Falls Reservoir in Washington County, Vermont is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 10.8 ft visibility. Surface area: 411 acres.
- Clarity
- 10.8 ft
- Max depth
- ~52 ft est.
- Area
- 411 acres
- Trend
- ↑ Improving
- Public access
- Yes
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Watch Mollys Falls Reservoir’s letter
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Why Mollys Falls Reservoir has no grade
Mollys Falls Reservoir has monitoring on record from one station, but only water clarity was measured. LakeQuality’s A–F letter uses total phosphorus, total nitrogen, chlorophyll-a, and turbidity against EPA National Lakes Assessment condition classes. With none of those grading measurements on record, Mollys Falls Reservoir is Not Rated — not an F. Its 10.8-foot median from 44 readings collected 2021–2025 is still shown as clarity, but clarity alone cannot earn a letter.
Not Rated is EPA Integrated Reporting Category 3 — insufficient information. Everything below that has been measured is still reported on this page.
Sampling is run by VT DEC and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Mollys Falls Reservoir is a 411-acre lake in Washington County, Vermont with an estimated average depth of about 52 feet. Overall water quality is improving over recent sampling years. Limited fish-species data available. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, VT DEC, last sampled 2025-08-06. Grade methodology: LakeQuality methodology.
What Mollys Falls Reservoir is good for
From access and monitoring records, not editorial picks.
- Clear water10.8 ft of visibility
- Boat launch1 documented ramp
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for Mollys Falls Reservoir
These readings exist but are not enough for an A–F grade — see why.
Good clarity, visible to about 10.8 ft. TSI 43.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 10.8 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 43 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~52 ft est. |
| Average Depth | ~41 ft est. |
| Surface Area | 411 acres |
| Public Access | Yes |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Vermont has not published bathymetry for Mollys Falls 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.
Recreation & Access
- Marshfield DamPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Mollys Falls Reservoir
Water Quality Trend: ↑ Improving
Based on 4 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.15 m/yr | 4 |
Reservoir Info (USACE NID)
Mollys Falls Reservoir is a man-made reservoir impounded by the Marshfield No. 6 (completed 1927), built primarily for hydroelectric on the Mollys Brook; earth-type dam, 48 ft tall and 1,100 ft long.
- Surface area
- 411 ac
- Normal storage
- 0 ac-ft
- Max storage
- 13,526 ac-ft
- Drainage area
- 19 sq mi
- Hazard class
- High
- Owner
- GREEN MOUNTAIN POWER CORP
All listed purposes: Hydroelectric;Recreation.
Source: USACE National Inventory of Dams, NID ID VT00046 · Operator website
Graded lakes near Mollys Falls Reservoir
Mollys Falls Reservoir has no grade, but these lakes within a short drive do.
Nearby Lakes in Washington County
Frequently asked questions about Mollys Falls Reservoir
Where is Mollys Falls Reservoir?
- Mollys Falls Reservoir is a lake in Washington County, Vermont. LakeQuality has not rated this lake (UNRATED) — the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity.
What is the water quality grade for Mollys Falls Reservoir?
- Mollys Falls Reservoir in Washington County, Vermont is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 10.8 ft visibility. Surface area: 411 acres.
Is Mollys Falls Reservoir safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
How deep is Mollys Falls Reservoir?
- No published bathymetric survey covers Mollys Falls Reservoir, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 52 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 411 acres.
Are there boat ramps on Mollys Falls Reservoir?
- Mollys Falls Reservoir has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Marshfield Dam. Public access is listed as yes.
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Where this data comes from
44 measurements from 1 monitoring station, 2021–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Vermont Dept of Environmental Conservation
1VTDECWQ44 samples · 2021–2025
Analytical methods
- EPA approved Alternate Test Procedure for 4500 P H. Has a 28 day hold without acid preservation.
- 445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence
- 2130 B ~ Nephelometric Method
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
Lake size & watershed from HydroLAKES (HydroSHEDS)
Named boat-access points from the USGS National Boat Ramps inventory