Lake Ninevah
Rutland County, Vermont237 acresView mapDirections
Clarity, phosphorus, and algae all sit in the cleanest band for this region.
↑ up from B at the last regrade
- Mesotrophic
- #10 of 15 in the county
- 31 ft max depth
- Public access
Lake Ninevah in Rutland County, Vermont has a water quality grade of A (Excellent). Water clarity: 8.2 ft visibility. Phosphorus: 11.4 µg/L. Chlorophyll-a (algae): 2 µg/L. Surface area: 237 acres.
- Clarity
- 8.2 ft
- Max depth
- ~31 ft est.
- Area
- 237 acres
- Type
- Mesotrophic
- Phosphorus
- 11.4 µg/L
- Chlorophyll-a
- 2 µg/L
- Trend
- ↑ Improving
- Public access
- Yes
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Watch Lake Ninevah’s letter
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Lake Ninevah is a 237-acre mesotrophic lake in Rutland County, Vermont with an estimated average depth of about 31 feet. Water quality is graded A based on 2 sampling years through 2025. Overall water quality is improving over recent sampling years. Limited fish-species data available. Public access is available with 1 public boat landing. Compared to the 14 other monitored lakes in Rutland County, Lake Ninevah ranks #10 for water quality.
Source: EPA Water Quality Portal sampling records, VT DEC, last sampled 2025-08-21. Grade methodology: LakeQuality methodology.
What Lake Ninevah is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
Swimming Safety
Grade onlyLow algae
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
The A is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Water Quality Grade: A (Excellent)
Moderate clarity, visible to about 8.2 ft. Phosphorus 11.4 µg/L. Chlorophyll-a 2 µg/L. TSI 41. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 8.2 ft | Not graded |
| Phosphorus | 11.4 µg/L | Good |
| Chlorophyll-a (Algae) | 2 µg/L | Good |
| Trophic State Index (TSI) | 41 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~31 ft est. |
| Average Depth | ~18 ft est. |
| Surface Area | 237 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 Lake Ninevah.
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
- Joseph WiltshirePublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Lake Ninevah
Water Quality Trend: ↑ Improving
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.055 m/yr | 5 |
| Phosphorus | ↑ Improving | -0.8 µg/L/yr | 4 |
| Chlorophyll-a | ↑ Improving | -0.75 µg/L/yr | 3 |
Reservoir Info (USACE NID)
Lake Ninevah is a man-made reservoir impounded by the Lake Ninevah (completed 1930), built primarily for recreation on the Patch Brook; earth-type dam, 13 ft tall and 176 ft long.
- Surface area
- 237 ac
- Normal storage
- 0 ac-ft
- Max storage
- 1,500 ac-ft
- Drainage area
- 1.2 sq mi
- Hazard class
- Significant
- Owner
- NINEVAH FOUNDATION
Source: USACE National Inventory of Dams, NID ID VT00203 · Operator website
County Ranking
Ranked #10 of 15 lakes in Rutland County
Nearby Lakes in Rutland County
Frequently asked questions about Lake Ninevah
Where is Lake Ninevah?
- Lake Ninevah is a lake in Rutland County, Vermont. LakeQuality grades it A for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Lake Ninevah?
- Lake Ninevah in Rutland County, Vermont has a water quality grade of A (Excellent). Water clarity: 8.2 ft visibility. Phosphorus: 11.4 µg/L. Chlorophyll-a (algae): 2 µg/L. Surface area: 237 acres.
Is Lake Ninevah safe to swim in?
- The A is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
How deep is Lake Ninevah?
- No published bathymetric survey covers Lake Ninevah, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 31 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 237 acres.
Are there boat ramps on Lake Ninevah?
- Lake Ninevah has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Joseph Wiltshire. Public access is listed as yes.
Explore Lake Ninevah across LakeQuality
More Vermont Lake Rankings
Other Grade A Lakes in Vermont
Mesotrophic Lakes in Vermont
Where this data comes from
72 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
1VTDECWQ72 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
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