Mountain Brook Reservoir
Cheshire County, New Hampshire234 acresView mapDirections
No nutrient or algae sampling on record from NHDES for this lake.
- Impaired · Mercury
- 10 ft max depth
Mountain Brook Reservoir in Cheshire County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Maximum depth: 10 ft. Surface area: 234 acres.
Mountain Brook Reservoir is a 234-acre lake in Cheshire County, New Hampshire with a maximum depth of 10 feet (3-foot average).
Source: EPA Water Quality Portal sampling records, your state environmental agency. Methodology: how these readings are compared.
Swimming conditions
No readingNot rated
Nutrient and algae readings are not a swimming clearance. Mountain Brook Reservoir is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
Whether Mountain Brook Reservoir is safe to swim in today is a call for the New Hampshire Department of Environmental Services and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Mountain Brook Reservoir
These are the measurements NHDES publishes for Mountain Brook Reservoir, 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 Brook Reservoir
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
10 ft
Average depth
3.3 ft
Surface area
234 acres
Shoreline
6.4 mi
The depth above comes from a bathymetric survey of this lake, not from a regional estimate.
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Fishing Mountain Brook Reservoir
EPA Impairment Status
Mountain Brook Reservoir is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).
Causes of impairment
Designated uses not supporting: Fish consumption.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit NHLAK700030101-11 · Official waterbody report
Nearby Lakes in Cheshire County
Frequently asked questions about Mountain Brook Reservoir
Where is Mountain Brook Reservoir?
- Mountain Brook Reservoir is a lake in Cheshire County, New Hampshire. Its water-quality measurements are published by NHDES and shown on this page as reported.
What is the water quality of Mountain Brook Reservoir?
- Mountain Brook Reservoir in Cheshire County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Maximum depth: 10 ft. Surface area: 234 acres.
Is Mountain Brook Reservoir safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Mountain Brook Reservoir is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
How deep is Mountain Brook Reservoir?
- Mountain Brook Reservoir has a maximum depth of 10 feet and an average depth of 3.3 feet. The lake covers 234 acres.
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Where this data comes from
Measurements for Mountain Brook Reservoir 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