Blue Mountain Lake
Hamilton County, New YorkView mapDirections
NY DEC publishes the water-quality measurements for Blue Mountain Lake. Here is what has been measured.
- Impaired · Mercury
- 56 ft max depth
- Limited data
Ask about Blue Mountain Lake
Answers come straight from the public measurements and survey records on this page.
Blue Mountain Lake in Hamilton County, New York has water-quality measurements published by NY DEC, shown here as reported. Water clarity: 21 ft visibility.
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Blue Mountain Lake is a lake in Hamilton County, New York with an estimated average depth of about 56 feet.
Source: EPA Water Quality Portal sampling records, NYSDEC, last sampled 2021-08-17. Grade methodology: LakeQuality methodology.
What Blue Mountain Lake is good for
From access and monitoring records, not editorial picks.
- Clear water21 ft of visibility
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Blue Mountain Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
Whether Blue Mountain Lake is safe to swim in today is a call for the New York Department of Environmental Conservation and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Blue Mountain Lake
These are the measurements NY DEC publishes for Blue Mountain Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Crystal clear, you can see 21 ft down. TSI 33.
| Metric | Value | EPA condition class |
|---|---|---|
| Water Clarity (Secchi Depth) | 21 ft | Measured, not scored |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 33 | Oligotrophic |
Low nutrients, clear water. No reading is a swimming clearance.
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~56 ft est. |
| Average Depth | ~38 ft est. |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. New York has not published bathymetry for Blue Mountain Lake.
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 Blue Mountain Lake
EPA Impairment Status
Blue Mountain Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 4A).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit NY0903-0204 · Official waterbody report
Nearby Lakes in Hamilton County
Frequently asked questions about Blue Mountain Lake
Where is Blue Mountain Lake?
- Blue Mountain Lake is a lake in Hamilton County, New York. Its water-quality measurements are published by NY DEC and shown on this page as reported.
What is the water quality of Blue Mountain Lake?
- Blue Mountain Lake in Hamilton County, New York has water-quality measurements published by NY DEC, shown here as reported. Water clarity: 21 ft visibility.
Is Blue Mountain Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Blue Mountain Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
How deep is Blue Mountain Lake?
- No published bathymetric survey covers Blue Mountain Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 56 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
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Where this data comes from
4 measurements from 1 monitoring station, 2021. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- USGS New York Water Science Center
USGS-NY4 samples · 2021
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)