Rock Pond-Deep Spot
Rockingham County, New Hampshire40 acresView mapDirections
NHDES publishes the water-quality measurements for Rock Pond-Deep Spot. Here is what has been measured.
- Mesotrophic
- Impaired · Mercury
Rock Pond-Deep Spot in Rockingham County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Phosphorus: 13.2 µg/L. Chlorophyll-a (algae): 5.1 µg/L. Surface area: 40 acres.
Rock Pond-Deep Spot is a 40-acre mesotrophic lake in Rockingham County, New Hampshire. Compared to the 50 other monitored lakes in Rockingham County, Rock Pond-Deep Spot ranks #8 for water quality.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2025-09-08. 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. Rock Pond-Deep Spot is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
Whether Rock 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 Rock Pond-Deep Spot
These are the measurements NHDES publishes for Rock 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 13.2 µg/L. Chlorophyll-a 5.1 µg/L. TSI 44.
| 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 | 13.2µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | 5.1µg/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. | 44 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Rock Pond-Deep Spot
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Lake Details
Surface area
40 acres
No bathymetric survey has been published for Rock Pond-Deep Spot, so its depth is not documented here.
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Fishing Rock Pond-Deep Spot
Reservoir Info (USACE NID)
Rock Pond-Deep Spot is a man-made reservoir impounded by the Marston Finn Conservation Dam (completed 1778), built primarily for recreation on the Golden Brook; earth-type dam, 14 ft tall and 193 ft long.
- Surface area
- 40 ac
- Normal storage
- 168 ac-ft
- Max storage
- 263 ac-ft
- Drainage area
- 12.12 sq mi
- Hazard class
- Low
- Owner
- MOECKEL POND VILLAGE DISTRICT
Source: USACE National Inventory of Dams, NID ID NH00915 · Operator website · Matched by proximity (0.66 km)
EPA Impairment Status
Rock 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 NHLAK700061204-03 · Official waterbody report
Nearby Lakes in Rockingham County
Frequently asked questions about Rock Pond-Deep Spot
Where is Rock Pond-Deep Spot?
- Rock Pond-Deep Spot is a lake in Rockingham County, New Hampshire. Its water-quality measurements are published by NHDES and shown on this page as reported.
What is the water quality of Rock Pond-Deep Spot?
- Rock Pond-Deep Spot in Rockingham County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Phosphorus: 13.2 µg/L. Chlorophyll-a (algae): 5.1 µg/L. Surface area: 40 acres.
Is Rock Pond-Deep Spot safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Rock Pond-Deep Spot is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
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Where this data comes from
22 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)
1111330022 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