Gilman Pond-Deep Spot
Gilman Pond-Deep Spot in Sullivan County, New Hampshire is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 5 µg/L. Chlorophyll-a (algae): 0.6 µg/L.
Why Gilman Pond-Deep Spot 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 Gilman Pond-Deep Spot, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded phosphorus and algae (chlorophyll-a), but not water clarity.
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.
Gilman Pond-Deep Spot is a lake in Sullivan County, New Hampshire.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2020-06-18. 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 Gilman Pond-Deep Spot
These readings exist but do not meet the evidence bar for an A–F grade — see why.
No clarity data. Phosphorus level: 5 µg/L. Chlorophyll-a: 0.6 µg/L. Trophic State Index: 27.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 5 µg/L | Not graded |
| Chlorophyll-a (Algae) | 0.6 µg/L | Not graded |
| Trophic State Index (TSI) | 27 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Gilman Pond-Deep Spot
Compare lakeside cabins, hotels, and vacation rentals near Gilman Pond-Deep Spot in Sullivan 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 Gilman Pond-Deep Spot
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Fishing Gilman Pond-Deep Spot
EPA Impairment Status
Gilman Pond-Deep Spot 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 NHLAK801060403-01 · Official waterbody report · Matched by proximity (0.29 km)
Graded lakes near Gilman Pond-Deep Spot
Gilman Pond-Deep Spot has no grade, but these lakes within a short drive do.
Nearby Lakes in Sullivan County
Frequently asked questions about Gilman Pond-Deep Spot
Where is Gilman Pond-Deep Spot?
- Gilman Pond-Deep Spot is a lake in Sullivan 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 Gilman Pond-Deep Spot?
- Gilman Pond-Deep Spot in Sullivan County, New Hampshire is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 5 µg/L. Chlorophyll-a (algae): 0.6 µg/L.
Is Gilman Pond-Deep Spot safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Gilman Pond-Deep Spot is not rated for water quality — its monitoring record does not meet the evidence bar. Algae concentration (chlorophyll-a) is 0.6 µg/L. Always check local health department advisories before swimming.
Explore Gilman Pond-Deep Spot 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
2 measurements from 1 monitoring station, 2020. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- New Hampshire Department Of Environmental Services (BEACH)
111133002 samples · 2020
Analytical methods
- 10-115-01-1 F ~ LACHAT; Total Phosphorus- Manual persulfate digest
- CHLOROPHYLL A-B-C DETERMINATION (MODIFIED)
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