Bear Hill Pond-Deep Spot
Merrimack County, New Hampshire31 acresView mapDirections
NHDES publishes the water-quality measurements for Bear Hill Pond-Deep Spot. Here is what has been measured.
- Oligotrophic
- Impaired · Mercury
- Limited data
Bear Hill Pond-Deep Spot in Merrimack County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Phosphorus: 7.4 µg/L. Surface area: 31 acres.
Bear Hill Pond-Deep Spot is a 31-acre cold, clear oligotrophic lake in Merrimack County, New Hampshire. Compared to the 40 other monitored lakes in Merrimack County, Bear Hill Pond-Deep Spot ranks #24 for water quality.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2025-06-12. 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. Bear Hill 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 Bear Hill 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 Bear Hill Pond-Deep Spot
These are the measurements NHDES publishes for Bear Hill 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 7.4 µg/L. TSI 33.
| 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 | 7.4µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | No reading 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. | 33 | Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Low nutrients, clear water. No reading is a swimming clearance.
Ask about Bear Hill Pond-Deep Spot
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
31 acres
No bathymetric survey has been published for Bear Hill Pond-Deep Spot, so its depth is not documented here.
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Fishing Bear Hill Pond-Deep Spot
Reservoir Info (USACE NID)
Bear Hill Pond-Deep Spot is a man-made reservoir impounded by the Bear Hill Pond Dam (completed 1885), built primarily for recreation on the Boat Meadow Brook; earth-type dam, 7 ft tall and 310 ft long.
- Surface area
- 31 ac
- Normal storage
- 48 ac-ft
- Max storage
- 90 ac-ft
- Drainage area
- 0.26 sq mi
- Hazard class
- Low
- Owner
- NH DNCR
Source: USACE National Inventory of Dams, NID ID NH00927 · Operator website · Matched by proximity (0.56 km)
EPA Impairment Status
Bear Hill 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 NHLAK700060503-01 · Official waterbody report
Nearby Lakes in Merrimack County
Frequently asked questions about Bear Hill Pond-Deep Spot
Where is Bear Hill Pond-Deep Spot?
- Bear Hill Pond-Deep Spot is a lake in Merrimack County, New Hampshire. Its water-quality measurements are published by NHDES and shown on this page as reported.
What is the water quality of Bear Hill Pond-Deep Spot?
- Bear Hill Pond-Deep Spot in Merrimack County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Phosphorus: 7.4 µg/L. Surface area: 31 acres.
Is Bear Hill Pond-Deep Spot safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Bear Hill 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
7 measurements from 1 monitoring station, 2023–2025. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- New Hampshire Department Of Environmental Services (BEACH)
111133007 samples · 2023–2025
Analytical methods
- 10-115-01-1 F ~ LACHAT; Total Phosphorus- Manual persulfate digest
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