Big Brook Bog
Coos County, New Hampshire36 acresView mapDirections
No nutrient or algae sampling on record from NHDES for this lake.
- Impaired · Mercury
- 5 ft max depth
Big Brook Bog in Coos County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Maximum depth: 5 ft. Surface area: 36 acres.
Big Brook Bog is a 36-acre lake in Coos County, New Hampshire with a maximum depth of 5 feet.
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. Big Brook Bog is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
Whether Big Brook Bog 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 Big Brook Bog
These are the measurements NHDES publishes for Big Brook Bog, 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.
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Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
5 ft
Surface area
36 acres
Shoreline
1 mi
The depth above comes from a bathymetric survey of this lake, not from a regional estimate.
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Fishing Big Brook Bog
EPA Impairment Status
Big Brook Bog 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 NHLAK801010102-01 · Official waterbody report
Nearby Lakes in Coos County
Frequently asked questions about Big Brook Bog
Where is Big Brook Bog?
- Big Brook Bog is a lake in Coos County, New Hampshire. Its water-quality measurements are published by NHDES and shown on this page as reported.
What is the water quality of Big Brook Bog?
- Big Brook Bog in Coos County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Maximum depth: 5 ft. Surface area: 36 acres.
Is Big Brook Bog safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Big Brook Bog is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
How deep is Big Brook Bog?
- Big Brook Bog has a maximum depth of 5 feet. The lake covers 36 acres.
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Where this data comes from
Measurements for Big Brook Bog 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