Grassy Pond
Merrimack County, New Hampshire35 acresView mapDirections
No nutrient or algae sampling on record from NHDES for this lake.
- Impaired · Mercury
- 20 ft max depth
Grassy Pond in Merrimack County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Maximum depth: 20 ft. Surface area: 35 acres.
Grassy Pond is a 35-acre lake in Merrimack County, New Hampshire with a maximum depth of 20 feet (7-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. Grassy Pond is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
Whether Grassy 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 Grassy Pond
These are the measurements NHDES publishes for Grassy 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 Grassy Pond
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
20 ft
Average depth
6.6 ft
Surface area
35 acres
Shoreline
1.5 mi
The depth above comes from a bathymetric survey of this lake, not from a regional estimate.
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Fishing Grassy Pond
EPA Impairment Status
Grassy 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 NHLAK700030505-03 · Official waterbody report
Nearby Lakes in Merrimack County
Frequently asked questions about Grassy Pond
Where is Grassy Pond?
- Grassy 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 Grassy Pond?
- Grassy Pond in Merrimack County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Maximum depth: 20 ft. Surface area: 35 acres.
Is Grassy Pond safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Grassy Pond is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
How deep is Grassy Pond?
- Grassy Pond has a maximum depth of 20 feet and an average depth of 6.6 feet. The lake covers 35 acres.
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Where this data comes from
Measurements for Grassy 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