Partridge Lake-Deep Spot
Partridge Lake-Deep Spot in Grafton County, New Hampshire has a water quality grade of C (Fair). Phosphorus: 16.9 µg/L. Chlorophyll-a (algae): 6.4 µg/L.
- Type
- Mesotrophic
- Public access
- Yes
Partridge Lake-Deep Spot is a mesotrophic lake in Grafton County, New Hampshire. Water quality is graded C based on 2 sampling years through 2025. Limited fish-species data available. Public access is available with 5 public boat landings. Compared to the 26 other monitored lakes in Grafton County, Partridge Lake-Deep Spot ranks #24 for water quality.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2025-08-20. Grade methodology: LakeGrade methodology.
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Swimming Safety
Grade onlyBacteria advisory
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Generally safe for swimming, moderate water quality
Water Quality Grade: C (Fair)
No clarity data. Phosphorus level: 16.9 µg/L. Chlorophyll-a: 6.4 µg/L. Trophic State Index: 47.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 16.9 µg/L | Fair |
| Chlorophyll-a (Algae) | 6.4 µg/L | Fair |
| Trophic State Index (TSI) | 47 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Partridge Lake-Deep Spot
Compare lakeside cabins, hotels, and vacation rentals near Partridge Lake-Deep Spot in Grafton 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 Partridge Lake-Deep Spot
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Recreation & Access
- Moore Dam Visitor CenterPublic
- Waterford BridgePublic
- Dodge HillPublic
- Pattenville Picnic AreaPublic
- Pine IslandPublic
Named access points from the USGS National Boat Ramps inventory, snapped within 5 km. More lakes with boat ramps
Fishing Partridge Lake-Deep Spot
EPA Impairment Status
Partridge Lake-Deep Spot is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit NHLAK801030502-03 · Official waterbody report · Matched by proximity (0.41 km)
County Ranking
Ranked #24 of 27 lakes in Grafton County
Nearby Lakes in Grafton County
Frequently asked questions about Partridge Lake-Deep Spot
Where is Partridge Lake-Deep Spot?
- Partridge Lake-Deep Spot is a lake in Grafton County, New Hampshire. LakeQuality grades it C for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Partridge Lake-Deep Spot?
- Partridge Lake-Deep Spot in Grafton County, New Hampshire has a water quality grade of C (Fair). Phosphorus: 16.9 µg/L. Chlorophyll-a (algae): 6.4 µg/L.
Is Partridge Lake-Deep Spot safe to swim in?
- Generally safe for swimming, moderate water quality. Partridge Lake-Deep Spot has a water quality grade of C (Fair). Algae concentration (chlorophyll-a) is 6.4 µg/L. Always check local health department advisories before swimming.
Are there boat ramps on Partridge Lake-Deep Spot?
- Partridge Lake-Deep Spot has 5 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Moore Dam Visitor Center, Waterford Bridge, Dodge Hill, Pattenville Picnic Area, among others. Public access is listed as yes.
Explore Partridge Lake-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 Grade C Lakes in New Hampshire
Mesotrophic Lakes in New Hampshire
Where this data comes from
65 measurements from 1 monitoring station, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- New Hampshire Department Of Environmental Services (BEACH)
1111330065 samples · 2020–2025
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
Named boat-access points from the USGS National Boat Ramps inventory