Lower Danforth Pond-Deep Spot
Carroll County, New HampshireView mapDirections
NHDES publishes the water-quality measurements for Lower Danforth Pond-Deep Spot. Here is what has been measured.
- Mesotrophic
- Impaired · Mercury
Lower Danforth Pond-Deep Spot in Carroll County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Phosphorus: 12.5 µg/L. Chlorophyll-a (algae): 3.6 µg/L.
Lower Danforth Pond-Deep Spot is a mesotrophic lake in Carroll County, New Hampshire. Compared to the 19 other monitored lakes in Carroll County, Lower Danforth Pond-Deep Spot ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2025-08-13. Methodology: how these readings are compared.
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. Lower Danforth 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 Lower Danforth 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 Lower Danforth Pond-Deep Spot
These are the measurements NHDES publishes for Lower Danforth 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 12.5 µg/L. Chlorophyll-a 3.6 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 | 12.5µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | 3.6µg/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
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Answers come straight from the public measurements and survey records on this page.
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Fishing Lower Danforth Pond-Deep Spot
EPA Impairment Status
Lower Danforth 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 NHLAK600020803-01-01 · Official waterbody report
Nearby Lakes in Carroll County
Frequently asked questions about Lower Danforth Pond-Deep Spot
Where is Lower Danforth Pond-Deep Spot?
- Lower Danforth Pond-Deep Spot is a lake in Carroll County, New Hampshire. Its water-quality measurements are published by NHDES and shown on this page as reported.
What is the water quality of Lower Danforth Pond-Deep Spot?
- Lower Danforth Pond-Deep Spot in Carroll County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Phosphorus: 12.5 µg/L. Chlorophyll-a (algae): 3.6 µg/L.
Is Lower Danforth Pond-Deep Spot safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Lower Danforth Pond-Deep Spot is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury, pH / acidity. Check local advisories before you swim.
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Where this data comes from
89 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)
1111330089 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)
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