Bath Covered Bridge Lake
Grafton County, New Hampshire24 acresView mapDirections
No nutrient or algae sampling on record from NHDES for this lake.
- Impaired · Mercury
- Limited data
Bath Covered Bridge Lake in Grafton County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Surface area: 24 acres.
Bath Covered Bridge Lake is a 24-acre lake in Grafton County, New Hampshire.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2024-09-23. Methodology: how these readings are compared.
Swimming conditions
No readingBacteria advisory
Nutrient and algae readings are not a swimming clearance. Bath Covered Bridge Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, pathogens (E. coli, fecal). Check local advisories before you swim.
Whether Bath Covered Bridge 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 Bath Covered Bridge Lake
These are the measurements NHDES publishes for Bath Covered Bridge 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.
Ask about Bath Covered Bridge Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
24 acres
No bathymetric survey has been published for Bath Covered Bridge Lake, so its depth is not documented here.
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Stays near Bath Covered Bridge Lake
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Fishing Bath Covered Bridge Lake
Reservoir Info (USACE NID)
Bath Covered Bridge Lake is a man-made reservoir impounded by the Ammonoosuc River (completed 1900), built primarily for hydroelectric on the Ammonoosuc River; concrete-type dam, 17 ft tall and 365 ft long.
- Surface area
- 24 ac
- Normal storage
- 280 ac-ft
- Max storage
- 352 ac-ft
- Drainage area
- 395 sq mi
- Hazard class
- Low
- Owner
- Bath Electric Power Company LLC
Source: USACE National Inventory of Dams, NID ID NH00061 · Operator website · Matched by proximity (0.06 km)
EPA Impairment Status
Bath Covered Bridge 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: Fish consumption, Recreation.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit NHIMP801030506-02 · Official waterbody report
Nearby Lakes in Grafton County
Frequently asked questions about Bath Covered Bridge Lake
Where is Bath Covered Bridge Lake?
- Bath Covered Bridge Lake is a lake in Grafton County, New Hampshire. Its water-quality measurements are published by NHDES and shown on this page as reported.
What is the water quality of Bath Covered Bridge Lake?
- Bath Covered Bridge Lake in Grafton County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Surface area: 24 acres.
Is Bath Covered Bridge Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Bath Covered Bridge Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, pathogens (E. coli, fecal). Check local advisories before you swim.
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Where this data comes from
13 measurements from 1 monitoring station, 2020–2024. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- New Hampshire Department Of Environmental Services (BEACH)
1111330013 samples · 2020–2024
Analytical methods
- Turbidity by Nephelometry
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