Walker Pond
Merrimack County, New Hampshire169 acresView mapDirections
NHDES publishes the water-quality measurements for Walker Pond. Here is what has been measured.
- Impaired · Mercury
- Limited data
Walker Pond in Merrimack County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Water clarity: 10.4 ft visibility. Surface area: 169 acres.
Walker Pond is a 169-acre lake in Merrimack County, New Hampshire.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2023-07-18. Methodology: how these readings are compared.
What Walker Pond is good for
From access and monitoring records, not editorial picks.
- Clear water10.4 ft of visibility
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Walker Pond is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, oxygen depletion (low DO), pH / acidity. Check local advisories before you swim.
Whether Walker 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 Walker Pond
These are the measurements NHDES publishes for Walker Pond, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Good clarity, visible to about 10.4 ft. TSI 43.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 10.4ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | No reading The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. | |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 43 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Walker Pond
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
169 acres
No bathymetric survey has been published for Walker Pond, so its depth is not documented here.
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Fishing Walker Pond
Reservoir Info (USACE NID)
Walker Pond is a man-made reservoir impounded by the Walker Pond Dam (completed 1900), built primarily for recreation on the Pond Brook; concrete-type dam, 6 ft tall and 37.5 ft long.
- Surface area
- 169 ac
- Normal storage
- 335 ac-ft
- Max storage
- 1,095 ac-ft
- Drainage area
- 9.09 sq mi
- Hazard class
- Undetermined
- Owner
- PENACOOK AND BOSCAWEN WATER PRECINCT
Source: USACE National Inventory of Dams, NID ID NH01334 · Operator website
EPA Impairment Status
Walker Pond 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 NHLAK700030506-02 · Official waterbody report
Nearby Lakes in Merrimack County
Frequently asked questions about Walker Pond
Where is Walker Pond?
- Walker 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 Walker Pond?
- Walker Pond in Merrimack County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Water clarity: 10.4 ft visibility. Surface area: 169 acres.
Is Walker Pond safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Walker Pond is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, oxygen depletion (low DO), pH / acidity. Check local advisories before you swim.
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Where this data comes from
1 measurement from 1 monitoring station, 2023. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- North American Lake Management Society
NALMS1 sample · 2023
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