Lake Winnepocket-Agoos Shore
Lake Winnepocket-Agoos Shore in Merrimack County, New Hampshire is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 6.3 µg/L. Surface area: 1 acres.
- Area
- 1 acres
Why Lake Winnepocket-Agoos Shore 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 Lake Winnepocket-Agoos Shore, 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.
Lake Winnepocket-Agoos Shore is a 1-acre lake in Merrimack County, New Hampshire.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2024-06-12. Grade methodology: LakeGrade methodology.
Watch Lake Winnepocket-Agoos Shore water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Lake Winnepocket-Agoos Shore
These readings exist but do not meet the evidence bar for an A–F grade — see why.
No clarity data. Phosphorus level: 6.3 µg/L. Trophic State Index: 31.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 6.3 µg/L | Not graded |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 31 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Lake Winnepocket-Agoos Shore
Compare lakeside cabins, hotels, and vacation rentals near Lake Winnepocket-Agoos Shore in Merrimack 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 Lake Winnepocket-Agoos Shore
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 1 acres |
No bathymetric survey has been published for Lake Winnepocket-Agoos Shore, so its depth is not documented here.
Fishing Lake Winnepocket-Agoos Shore
Reservoir Info (USACE NID)
Lake Winnepocket-Agoos Shore is a man-made reservoir impounded by the Blackwater Dam - Dodge Estate Dike (completed 1941), built primarily for flood risk reduction on the Blackwater River; gravity-type dam, 18 ft tall and 400 ft long.
- Surface area
- 1 ac
- Normal storage
- 0 ac-ft
- Max storage
- 93,400 ac-ft
- Drainage area
- 128 sq mi
- Hazard class
- High
- Owner
- USACE - New England District
Source: USACE National Inventory of Dams, NID ID NH03847 · Operator website · Matched by proximity (0.74 km)
EPA Impairment Status
Lake Winnepocket-Agoos Shore 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 NHLAK700030304-08 · Official waterbody report · Matched by proximity (0.62 km)
Graded lakes near Lake Winnepocket-Agoos Shore
Lake Winnepocket-Agoos Shore has no grade, but these lakes within a short drive do.
Nearby Lakes in Merrimack County
Frequently asked questions about Lake Winnepocket-Agoos Shore
Where is Lake Winnepocket-Agoos Shore?
- Lake Winnepocket-Agoos Shore is a lake in Merrimack 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 Lake Winnepocket-Agoos Shore?
- Lake Winnepocket-Agoos Shore in Merrimack County, New Hampshire is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 6.3 µg/L. Surface area: 1 acres.
Is Lake Winnepocket-Agoos Shore safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Lake Winnepocket-Agoos Shore is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
Explore Lake Winnepocket-Agoos Shore across LakeGrade
More New Hampshire Lake Rankings
Top 25 by overall water quality score
Top 25 by Secchi water clarity
Grade A/B + low algae filter
Panfish-rich, public access
Full state directory
Other Lakes in New Hampshire
Oligotrophic Lakes in New Hampshire
Where this data comes from
1 measurement from 1 monitoring station, 2024. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- New Hampshire Department Of Environmental Services (BEACH)
111133001 sample · 2024
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