Stratford Bog Pond-Deep Spot
Stratford Bog Pond-Deep Spot in Coos County, New Hampshire has a water quality grade of B (Good). Phosphorus: 8.8 µg/L. Surface area: 31 acres.
- Area
- 31 acres
- Type
- Oligotrophic
Stratford Bog Pond-Deep Spot is a 31-acre cold, clear oligotrophic lake in Coos County, New Hampshire. Water quality is graded B based on 1 sampling years through 2025. 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. Grade methodology: LakeGrade methodology.
Watch Stratford Bog Pond-Deep Spot water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
Swimming Safety
Grade onlyLimited data
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Good for swimming, clear water with low algae levels
Water Quality Grade: B (Good)
No clarity data. Phosphorus level: 8.8 µg/L. Trophic State Index: 35.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 8.8 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 35 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Stratford Bog Pond-Deep Spot
Compare lakeside cabins, hotels, and vacation rentals near Stratford Bog Pond-Deep Spot in Coos County, New Hampshire — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
Top-rated places to stay near Stratford Bog Pond-Deep Spot
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 31 acres |
No bathymetric survey has been published for Stratford Bog Pond-Deep Spot, so its depth is not documented here.
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
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit NHLAK801010602-01 · Official waterbody report · Matched by proximity (0.1 km)
County Ranking
Ranked #11 of 13 lakes in Coos County
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. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Stratford Bog Pond-Deep Spot?
- Stratford Bog Pond-Deep Spot in Coos County, New Hampshire has a water quality grade of B (Good). Phosphorus: 8.8 µg/L. Surface area: 31 acres.
Is Stratford Bog Pond-Deep Spot safe to swim in?
- Good for swimming, clear water with low algae levels. Stratford Bog Pond-Deep Spot has a water quality grade of B (Good). Always check local health department advisories before swimming.
Explore Stratford Bog Pond-Deep Spot across LakeGrade
More New Hampshire Lake Rankings
Top 25 by overall water quality score
Top 25 by Secchi water clarity
Grade A/B + low algae filter
Panfish-rich, public access
Full state directory
Other Grade B Lakes in New Hampshire
Oligotrophic Lakes in New Hampshire
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)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database