Trio Ponds
Coos County, New Hampshire69 acresView mapDirections
No nutrient or algae sampling on record from NHDES for this lake.
- Impaired · Mercury
- 30 ft max depth
Trio Ponds in Coos County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Maximum depth: 30 ft. Surface area: 69 acres.
Trio Ponds is a 69-acre lake in Coos County, New Hampshire with a maximum depth of 30 feet (12-foot average).
Source: EPA Water Quality Portal sampling records, your state environmental agency. Methodology: how these readings are compared.
What Trio Ponds is good for
From access and monitoring records, not editorial picks.
- Deep water30 ft surveyed max depth
Swimming conditions
No readingNot rated
Nutrient and algae readings are not a swimming clearance. Trio Ponds is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, metals (other than mercury), pH / acidity. Check local advisories before you swim.
Whether Trio Ponds 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 Trio Ponds
These are the measurements NHDES publishes for Trio Ponds, 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 Trio Ponds
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
30 ft
Average depth
12.1 ft
Surface area
69 acres
Shoreline
2.3 mi
The depth above comes from a bathymetric survey of this lake, not from a regional estimate.
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Fishing Trio Ponds
EPA Impairment Status
Trio Ponds 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.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit NHLAK801010706-03 · Official waterbody report
Nearby Lakes in Coos County
Frequently asked questions about Trio Ponds
Where is Trio Ponds?
- Trio Ponds 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 Trio Ponds?
- Trio Ponds in Coos County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Maximum depth: 30 ft. Surface area: 69 acres.
Is Trio Ponds safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Trio Ponds is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, metals (other than mercury), pH / acidity. Check local advisories before you swim.
How deep is Trio Ponds?
- Trio Ponds has a maximum depth of 30 feet and an average depth of 12.1 feet. The lake covers 69 acres.
Explore Trio Ponds across LakeQuality
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Where this data comes from
Measurements for Trio Ponds 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