Otter Pond-Deep Spot
Sullivan County, New Hampshire189 acresView mapDirections
NHDES publishes the water-quality measurements for Otter Pond-Deep Spot. Here is what has been measured.
- Mesotrophic
- Impaired · Mercury
- Public access
Otter Pond-Deep Spot in Sullivan County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Phosphorus: 9.8 µg/L. Chlorophyll-a (algae): 2.5 µg/L. Surface area: 189 acres.
Otter Pond-Deep Spot is a 189-acre mesotrophic lake in Sullivan County, New Hampshire. Limited fish-species data available. Public access is available with 1 public boat landing. Compared to the 23 other monitored lakes in Sullivan County, Otter Pond-Deep Spot ranks #5 for water quality.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2024-06-25. Methodology: how these readings are compared.
What Otter Pond-Deep Spot is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
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. Otter Pond-Deep Spot is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury, pH / acidity. Check local advisories before you swim.
Whether Otter 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 Otter Pond-Deep Spot
These are the measurements NHDES publishes for Otter 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 9.8 µg/L. Chlorophyll-a 2.5 µg/L. TSI 38.
| 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 | 9.8µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | 2.5µg/L | Good GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 38 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Otter Pond-Deep Spot
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
189 acres
Public access
Yes
Listed by NHDES
No bathymetric survey has been published for Otter Pond-Deep Spot, so its depth is not documented here.
Recreation & Access
- Georges Mill BeachPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Stays via Stay22
Stays near Otter Pond-Deep Spot
Compare lakeside cabins, hotels, and vacation rentals near Otter 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 Otter Pond-Deep Spot
Prices for Oct 9–11, 4 adults. Change dates on the map below.
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Follow Otter Pond-Deep Spot’s readings
Email me when new measurements post for this lake. Updates stay free.
Or email
Fishing Otter Pond-Deep Spot
Reservoir Info (USACE NID)
Otter Pond-Deep Spot is a man-made reservoir impounded by the Otter Pond Dam (completed 1920), built primarily for recreation on the Otter Pond Brook; earth-type dam, 12 ft tall and 70 ft long.
- Surface area
- 189 ac
- Normal storage
- 245 ac-ft
- Max storage
- 2,406 ac-ft
- Drainage area
- 15.43 sq mi
- Hazard class
- Low
- Owner
- TOWN OF SUNAPEE
Source: USACE National Inventory of Dams, NID ID NH00078 · Operator website · Matched by proximity (0.75 km)
EPA Impairment Status
Otter 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
Designated uses not supporting: Aquatic life, Fish consumption.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit NHLAK801060402-12-01 · Official waterbody report
Nearby Lakes in Sullivan County
Frequently asked questions about Otter Pond-Deep Spot
Where is Otter Pond-Deep Spot?
- Otter Pond-Deep Spot is a lake in Sullivan County, New Hampshire. Its water-quality measurements are published by NHDES and shown on this page as reported.
What is the water quality of Otter Pond-Deep Spot?
- Otter Pond-Deep Spot in Sullivan County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Phosphorus: 9.8 µg/L. Chlorophyll-a (algae): 2.5 µg/L. Surface area: 189 acres.
Is Otter Pond-Deep Spot safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Otter Pond-Deep Spot is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury, pH / acidity. Check local advisories before you swim.
Are there boat ramps on Otter Pond-Deep Spot?
- Otter Pond-Deep Spot has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Georges Mill Beach. Public access is listed as yes.
Can I fish at Otter Pond-Deep Spot?
- Otter Pond-Deep Spot has 1 documented boat landing in the USGS National Boat Ramps inventory. 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.
Explore Otter Pond-Deep Spot across LakeQuality
More lakes in New Hampshire
Other Lakes in New Hampshire
Mesotrophic Lakes in New Hampshire
Where this data comes from
19 measurements from 1 monitoring station, 2020–2024. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- New Hampshire Department Of Environmental Services (BEACH)
1111330019 samples · 2020–2024
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
Named boat-access points from the USGS National Boat Ramps inventory