Mirror Lake
Carroll County, New Hampshire333 acresView mapDirections
No nutrient or algae sampling on record from NHDES for this lake.
- Impaired · Biotoxins
- 40 ft max depth
- Public access
Mirror Lake in Carroll County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Maximum depth: 40 ft. Surface area: 333 acres.
Mirror Lake is a 333-acre lake in Carroll County, New Hampshire with a maximum depth of 40 feet (13-foot average). Limited fish-species data available. Public access is available with 2 public boat landings.
Source: EPA Water Quality Portal sampling records, your state environmental agency. Methodology: how these readings are compared.
What Mirror Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch2 documented ramps
- Deep water40 ft surveyed max depth
Swimming conditions
No readingBacteria advisory
Nutrient and algae readings are not a swimming clearance. Mirror Lake is listed impaired under Clean Water Act §303(d) (IR 5) for biotoxins, mercury, pH / acidity. Check local advisories before you swim.
Whether Mirror Lake 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 Mirror Lake
These are the measurements NHDES publishes for Mirror 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 Mirror Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
40 ft
Average depth
13.1 ft
Surface area
333 acres
Shoreline
4 mi
Public access
Yes
Listed by NHDES
The depth above comes from a bathymetric survey of this lake, not from a regional estimate.
Recreation & Access
- Mirror LakePublic
- Libby MuseumPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Stays via Stay22
Stays near Mirror Lake
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Fishing Mirror Lake
EPA Impairment Status
Mirror Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Designated uses not supporting: Aquatic life, Fish consumption, Recreation.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit NHLAK700020106-02-01 · Official waterbody report
Nearby Lakes in Carroll County
Frequently asked questions about Mirror Lake
Where is Mirror Lake?
- Mirror Lake is a lake in Carroll County, New Hampshire. Its water-quality measurements are published by NHDES and shown on this page as reported.
What is the water quality of Mirror Lake?
- Mirror Lake in Carroll County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Maximum depth: 40 ft. Surface area: 333 acres.
Is Mirror Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Mirror Lake is listed impaired under Clean Water Act §303(d) (IR 5) for biotoxins, mercury, pH / acidity. Check local advisories before you swim.
How deep is Mirror Lake?
- Mirror Lake has a maximum depth of 40 feet and an average depth of 13.1 feet. The lake covers 333 acres.
Are there boat ramps on Mirror Lake?
- Mirror Lake has 2 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Mirror Lake, Libby Museum. Public access is listed as yes.
Can I fish at Mirror Lake?
- Mirror Lake has 2 documented boat landings in the USGS National Boat Ramps inventory. Seasons, size and bag limits, and whether you need a license are set by New Hampshire's fish and wildlife agency, so check its current regulations before you go.
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Where this data comes from
Measurements for Mirror 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
Named boat-access points from the USGS National Boat Ramps inventory