Kilton Pond-Deep Spot
Grafton County, New Hampshire68 acresView mapDirections
NHDES publishes the water-quality measurements for Kilton Pond-Deep Spot. Here is what has been measured.
- Mesotrophic
- Impaired · Mercury
- Public access
- Limited data
Kilton Pond-Deep Spot in Grafton County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Phosphorus: 11.3 µg/L. Chlorophyll-a (algae): 4.2 µg/L. Surface area: 68 acres.
Kilton Pond-Deep Spot is a 68-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, Kilton Pond-Deep Spot ranks #8 for water quality.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2022-09-12. Methodology: how these readings are compared.
Swimming conditions
Readings onlyLimited data
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. Kilton Pond-Deep Spot is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
Whether Kilton 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 Kilton Pond-Deep Spot
These are the measurements NHDES publishes for Kilton 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 11.3 µg/L. Chlorophyll-a 4.2 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 | 11.3µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | 4.2µg/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. | 42 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Kilton Pond-Deep Spot
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
68 acres
Public access
Yes
Listed by NHDES
No bathymetric survey has been published for Kilton Pond-Deep Spot, so its depth is not documented here.
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Fishing Kilton Pond-Deep Spot
Reservoir Info (USACE NID)
Kilton Pond-Deep Spot is a man-made reservoir impounded by the Kilton Pond Dam (completed 1930), built primarily for recreation on the Smith River; stone-type dam, 12 ft tall and 180 ft long.
- Surface area
- 68 ac
- Normal storage
- 196 ac-ft
- Max storage
- 407 ac-ft
- Drainage area
- 7.25 sq mi
- Hazard class
- Low
- Owner
- NH DES WATER DIVISION
Source: USACE National Inventory of Dams, NID ID NH00024 · Operator website · Matched by proximity (0.08 km)
EPA Impairment Status
Kilton 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: Fish consumption.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit NHLAK700010701-02-01 · Official waterbody report
Nearby Lakes in Grafton County
Frequently asked questions about Kilton Pond-Deep Spot
Where is Kilton Pond-Deep Spot?
- Kilton 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 Kilton Pond-Deep Spot?
- Kilton Pond-Deep Spot in Grafton County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Phosphorus: 11.3 µg/L. Chlorophyll-a (algae): 4.2 µg/L. Surface area: 68 acres.
Is Kilton Pond-Deep Spot safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Kilton Pond-Deep Spot is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
Can I fish at Kilton Pond-Deep Spot?
- Public access to Kilton 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.
Explore Kilton 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
6 measurements from 1 monitoring station, 2021–2022. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- New Hampshire Department Of Environmental Services (BEACH)
111133006 samples · 2021–2022
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