Flaghole Pond
Merrimack County, New Hampshire67 acresView mapDirections
No nutrient or algae sampling on record from NHDES for this lake.
- Impaired · Mercury
- 18 ft max depth
Flaghole Pond in Merrimack County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Maximum depth: 18 ft. Surface area: 67 acres.
Flaghole Pond is a 67-acre lake in Merrimack County, New Hampshire with a maximum depth of 18 feet (11-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. Flaghole Pond is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
Whether Flaghole Pond 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 Flaghole Pond
These are the measurements NHDES publishes for Flaghole Pond, 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 Flaghole Pond
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
18 ft
Average depth
10.5 ft
Surface area
67 acres
Shoreline
2.6 mi
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Fishing Flaghole Pond
EPA Impairment Status
Flaghole Pond 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 NHLAK700030507-01 · Official waterbody report
Nearby Lakes in Merrimack County
Frequently asked questions about Flaghole Pond
Where is Flaghole Pond?
- Flaghole Pond is a lake in Merrimack County, New Hampshire. Its water-quality measurements are published by NHDES and shown on this page as reported.
What is the water quality of Flaghole Pond?
- Flaghole Pond in Merrimack County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Maximum depth: 18 ft. Surface area: 67 acres.
Is Flaghole Pond safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Flaghole Pond is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
How deep is Flaghole Pond?
- Flaghole Pond has a maximum depth of 18 feet and an average depth of 10.5 feet. The lake covers 67 acres.
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Where this data comes from
Measurements for Flaghole Pond 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