Mountain Lake
Warren County, New Jersey117 acresView mapDirections
No nutrient or algae sampling on record from NJDEP for this lake.
- Impaired · Impaired biota (cause unknown)
- 39 ft max depth
Mountain Lake in Warren County, New Jersey has water-quality measurements published by NJDEP, shown here as reported. Maximum depth: 39 ft. Surface area: 117 acres.
Mountain Lake is a 117-acre lake in Warren County, New Jersey with a maximum depth of 39 feet (17-foot average).
Source: EPA Water Quality Portal sampling records, your state environmental agency. Methodology: how these readings are compared.
What Mountain Lake is good for
From access and monitoring records, not editorial picks.
- Deep water39 ft surveyed max depth
Swimming conditions
No readingNot rated
Nutrient and algae readings are not a swimming clearance. Mountain Lake is listed impaired under Clean Water Act §303(d) (IR 5) for impaired biota (cause unknown), mercury, metals (other than mercury), pesticides, pCBs. Check local advisories before you swim.
Whether Mountain Lake is safe to swim in today is a call for the New Jersey Department of Environmental Protection and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Mountain Lake
These are the measurements NJDEP publishes for Mountain Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data. TSI undefined.
Ask about Mountain Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
39 ft
Average depth
17 ft
Surface area
117 acres
Shoreline
1.9 mi
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Fishing Mountain Lake
EPA Impairment Status
Mountain Lake 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: Drinking water, Aquatic life, Fish consumption.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit NJ02040105090040-01 · Official waterbody report
Nearby Lakes in Warren County
Frequently asked questions about Mountain Lake
Where is Mountain Lake?
- Mountain Lake is a lake in Warren County, New Jersey. Its water-quality measurements are published by NJDEP and shown on this page as reported.
What is the water quality of Mountain Lake?
- Mountain Lake in Warren County, New Jersey has water-quality measurements published by NJDEP, shown here as reported. Maximum depth: 39 ft. Surface area: 117 acres.
Is Mountain Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Mountain Lake is listed impaired under Clean Water Act §303(d) (IR 5) for impaired biota (cause unknown), mercury, metals (other than mercury), pesticides, pCBs. Check local advisories before you swim.
How deep is Mountain Lake?
- Mountain Lake has a maximum depth of 39 feet and an average depth of 17 feet. The lake covers 117 acres.
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Where this data comes from
Measurements for Mountain Lake come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database