Stratford Bog Pond-Deep Spot
Coos County, New Hampshire31 acresView mapDirections
NHDES publishes the water-quality measurements for Stratford Bog Pond-Deep Spot. Here is what has been measured.
- Oligotrophic
- Impaired · Mercury
- Limited data
Stratford Bog Pond-Deep Spot in Coos County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Phosphorus: 8.8 µg/L. Surface area: 31 acres.
Stratford Bog Pond-Deep Spot is a 31-acre cold, clear oligotrophic lake in Coos County, New Hampshire. Compared to the 12 other monitored lakes in Coos County, Stratford Bog Pond-Deep Spot ranks #11 for water quality.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2025-06-17. 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. Stratford Bog Pond-Deep Spot is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
Whether Stratford Bog 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 Stratford Bog Pond-Deep Spot
These are the measurements NHDES publishes for Stratford Bog 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 8.8 µg/L. TSI 35.
| 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 | 8.8µg/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. | 35 | Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Low nutrients, clear water. No reading is a swimming clearance.
Ask about Stratford Bog 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 Stratford Bog Pond-Deep Spot, so its depth is not documented here.
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Fishing Stratford Bog Pond-Deep Spot
Reservoir Info (USACE NID)
Stratford Bog Pond-Deep Spot is a man-made reservoir impounded by the Stratford Bog Pond Dam (completed 1934), built primarily for recreation on the Bog Brook; earth-type dam, 16 ft tall and 240 ft long.
- Surface area
- 31 ac
- Normal storage
- 79 ac-ft
- Max storage
- 392 ac-ft
- Drainage area
- 6 sq mi
- Hazard class
- High
- Owner
- NH FISH AND GAME DEPARTMENT
Source: USACE National Inventory of Dams, NID ID NH00074 · Operator website · Matched by proximity (0.23 km)
EPA Impairment Status
Stratford Bog 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 NHLAK801010602-01 · Official waterbody report
Nearby Lakes in Coos County
Frequently asked questions about Stratford Bog Pond-Deep Spot
Where is Stratford Bog Pond-Deep Spot?
- Stratford Bog Pond-Deep Spot is a lake in Coos County, New Hampshire. Its water-quality measurements are published by NHDES and shown on this page as reported.
What is the water quality of Stratford Bog Pond-Deep Spot?
- Stratford Bog Pond-Deep Spot in Coos County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Phosphorus: 8.8 µg/L. Surface area: 31 acres.
Is Stratford Bog Pond-Deep Spot safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Stratford Bog Pond-Deep Spot is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
Explore Stratford Bog Pond-Deep Spot across LakeQuality
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Where this data comes from
6 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)
111133006 samples · 2023–2025
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