Reservoir Pond-Deep Spot
Grafton County, New Hampshire155 acresView mapDirections
NHDES publishes the water-quality measurements for Reservoir Pond-Deep Spot. Here is what has been measured.
- Mesotrophic
- Impaired · Algal growth
- Public access
Reservoir Pond-Deep Spot in Grafton County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Phosphorus: 10.4 µg/L. Chlorophyll-a (algae): 5 µg/L. Surface area: 155 acres.
Reservoir Pond-Deep Spot is a 155-acre mesotrophic lake in Grafton County, New Hampshire. Limited fish-species data available. Public access is available. Compared to the 26 other monitored lakes in Grafton County, Reservoir Pond-Deep Spot ranks #15 for water quality.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2025-08-20. Methodology: how these readings are compared.
What Reservoir Pond-Deep Spot is good for
From access and monitoring records, not editorial picks.
- Camping1 public campground nearby
Swimming conditions
Readings onlyLow algae
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Reservoir Pond-Deep Spot is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, mercury, nutrients (phosphorus, nitrogen), pH / acidity. Check local advisories before you swim.
Whether Reservoir Pond-Deep Spot 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 Reservoir Pond-Deep Spot
These are the measurements NHDES publishes for Reservoir Pond-Deep Spot, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data. Phosphorus 10.4 µg/L. Chlorophyll-a 5 µg/L. TSI 42.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | No reading How deep a black-and-white disk stays visible from the surface. Higher is clearer. | |
| Total phosphorus | 10.4µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | 5µg/L | Measured, not scored 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. | 42 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Reservoir Pond-Deep Spot
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
155 acres
Public access
Yes
Listed by NHDES
No bathymetric survey has been published for Reservoir Pond-Deep Spot, so its depth is not documented here.
Recreation & Access
Public campgrounds near Reservoir Pond-Deep Spot
- Smarts Mountain Shelter4.2 km
Nearest public campgrounds in the USGS National Map inventory, within about 3 miles. An empty list means USGS records no campground that close, which is not the same as camping being unavailable. Where the source gives an official reservation link, it is used; the cabin and hotel search does not cover campsites. More camping lakes
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Stays near Reservoir Pond-Deep Spot
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Fishing Reservoir Pond-Deep Spot
Reservoir Info (USACE NID)
Reservoir Pond-Deep Spot is a man-made reservoir impounded by the Reservoir Pond Dam (completed 1900), built primarily for recreation on the Tr Mascoma River; earth-type dam, 11 ft tall and 200 ft long.
- Surface area
- 155 ac
- Normal storage
- 2,120 ac-ft
- Max storage
- 2,796 ac-ft
- Drainage area
- 4.48 sq mi
- Hazard class
- Low
- Owner
- ALISON A KELSEY RESERVOIR POND TRUST
Source: USACE National Inventory of Dams, NID ID NH00461 · Operator website · Matched by proximity (0.73 km)
EPA Impairment Status
Reservoir Pond-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
Designated uses not supporting: Aquatic life, Fish consumption.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit NHLAK801060101-05 · Official waterbody report
Nearby Lakes in Grafton County
Frequently asked questions about Reservoir Pond-Deep Spot
Where is Reservoir Pond-Deep Spot?
- Reservoir Pond-Deep Spot is a lake in Grafton County, New Hampshire. Its water-quality measurements are published by NHDES and shown on this page as reported.
What is the water quality of Reservoir Pond-Deep Spot?
- Reservoir Pond-Deep Spot in Grafton County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Phosphorus: 10.4 µg/L. Chlorophyll-a (algae): 5 µg/L. Surface area: 155 acres.
Is Reservoir Pond-Deep Spot safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Reservoir Pond-Deep Spot is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth, mercury, nutrients (phosphorus, nitrogen), pH / acidity. Check local advisories before you swim.
Can I fish at Reservoir Pond-Deep Spot?
- Public access to Reservoir Pond-Deep Spot is listed as yes on the lake record. Seasons, size and bag limits, and whether you need a license are set by New Hampshire's fish and wildlife agency, so check its current regulations before you go.
Are there campgrounds on Reservoir Pond-Deep Spot?
- Reservoir Pond-Deep Spot has 1 public campground from USGS The National Map within 5 km, including Smarts Mountain Shelter. This is a location join, not a booking. Cabins and hotels are listed separately; campsite reservations use the official link when the source provides one.
Explore Reservoir Pond-Deep Spot across LakeQuality
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Where this data comes from
19 measurements from 1 monitoring station, 2021–2025. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- New Hampshire Department Of Environmental Services (BEACH)
1111330019 samples · 2021–2025
Analytical methods
- 10-115-01-1 F ~ LACHAT; Total Phosphorus- Manual persulfate digest
- CHLOROPHYLL A-B-C DETERMINATION (MODIFIED)
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
Public campgrounds from USGS The National Map Structures, within about 3 miles