Ayers Pond-Northwest Cove
Ayers Pond-Northwest Cove in Strafford County, New Hampshire is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 11.9 µg/L. Surface area: 236 acres.
- Area
- 236 acres
Why Ayers Pond-Northwest Cove has no grade
We grade a lake only when its monitoring record clears the evidence bar: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Ayers Pond-Northwest Cove, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded phosphorus, but not water clarity and algae (chlorophyll-a).
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by your state environmental agency and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Ayers Pond-Northwest Cove is a 236-acre lake in Strafford County, New Hampshire.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2023-07-06. Grade methodology: LakeGrade methodology.
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Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Ayers Pond-Northwest Cove
These readings exist but do not meet the evidence bar for an A–F grade — see why.
No clarity data. Phosphorus level: 11.9 µg/L. Trophic State Index: 40.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 11.9 µg/L | Not graded |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 40 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Ayers Pond-Northwest Cove
Compare lakeside cabins, hotels, and vacation rentals near Ayers Pond-Northwest Cove in Strafford County, New Hampshire — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
Top-rated places to stay near Ayers Pond-Northwest Cove
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 236 acres |
No bathymetric survey has been published for Ayers Pond-Northwest Cove, so its depth is not documented here.
Fishing Ayers Pond-Northwest Cove
Reservoir Info (USACE NID)
Ayers Pond-Northwest Cove is a man-made reservoir impounded by the Ayers Pond Dam (completed 1810), built primarily for recreation on the Tr Isinglass River; concrete-type dam, 18 ft tall and 375 ft long.
- Surface area
- 236 ac
- Normal storage
- 1,059 ac-ft
- Max storage
- 1,767 ac-ft
- Drainage area
- 2.35 sq mi
- Hazard class
- Significant
- Owner
- NH DES WATER DIVISION
Source: USACE National Inventory of Dams, NID ID NH00162 · Operator website · Matched by proximity (0.25 km)
EPA Impairment Status
Ayers Pond-Northwest Cove is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit NHLAK600030607-01 · Official waterbody report · Matched by proximity (1.14 km)
Graded lakes near Ayers Pond-Northwest Cove
Ayers Pond-Northwest Cove has no grade, but these lakes within a short drive do.
Nearby Lakes in Strafford County
Frequently asked questions about Ayers Pond-Northwest Cove
Where is Ayers Pond-Northwest Cove?
- Ayers Pond-Northwest Cove is a lake in Strafford County, New Hampshire. LakeQuality has not rated this lake (UNRATED) — there is not enough recent sampling to assign a letter.
What is the water quality grade for Ayers Pond-Northwest Cove?
- Ayers Pond-Northwest Cove in Strafford County, New Hampshire is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 11.9 µg/L. Surface area: 236 acres.
Is Ayers Pond-Northwest Cove safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Ayers Pond-Northwest Cove is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
Explore Ayers Pond-Northwest Cove across LakeGrade
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Grade A/B + low algae filter
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Where this data comes from
2 measurements from 1 monitoring station, 2023. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- New Hampshire Department Of Environmental Services (BEACH)
111133002 samples · 2023
Analytical methods
- 10-115-01-1 F ~ LACHAT; Total Phosphorus- Manual persulfate digest
Monitoring station identifiers (1)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database