Dorrs Pond-Deep Spot
Dorrs Pond-Deep Spot in Hillsborough County, New Hampshire has a water quality grade of D (Nutrient-rich). Phosphorus: 27.7 µg/L. Chlorophyll-a (algae): 13.3 µg/L. Surface area: 25 acres.
- Area
- 25 acres
- Type
- Eutrophic
- Public access
- Yes
Grade D measures nutrients and algae, not whether this is a good place for a cabin trip. Cabins and rentals near Dorrs Pond-Deep Spot →
Dorrs Pond-Deep Spot is a 25-acre productive, nutrient-rich eutrophic lake in Hillsborough County, New Hampshire. Water quality is graded D based on 2 sampling years through 2025. Limited fish-species data available. Public access is available with 1 public boat landing. Compared to the 35 other monitored lakes in Hillsborough County, Dorrs Pond-Deep Spot ranks #32 for water quality.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2025-08-27. Grade methodology: LakeGrade methodology.
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Swimming Safety
Grade onlyElevated nutrients
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.
Nutrients and algae run higher than average — check local advisories before swimming, and skip the water if you see scum
Water Quality Grade: D (Nutrient-rich)
No clarity data. Phosphorus level: 27.7 µg/L. Chlorophyll-a: 13.3 µg/L. Trophic State Index: 54.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 27.7 µg/L | Fair |
| Chlorophyll-a (Algae) | 13.3 µg/L | Poor |
| Trophic State Index (TSI) | 54 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Dorrs Pond-Deep Spot
Compare lakeside cabins, hotels, and vacation rentals near Dorrs Pond-Deep Spot in Hillsborough 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. The water-quality grade measures nutrients and algae, not lodging — cabins and rentals around Dorrs Pond-Deep Spot are listed below.
Top-rated places to stay near Dorrs Pond-Deep Spot
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 25 acres |
| Public Access | Yes |
No bathymetric survey has been published for Dorrs Pond-Deep Spot, so its depth is not documented here.
Recreation & Access
- West SidePublic
Named access points from the USGS National Boat Ramps inventory, snapped within 5 km. More lakes with boat ramps
Fishing Dorrs Pond-Deep Spot
Reservoir Info (USACE NID)
Dorrs Pond-Deep Spot is a man-made reservoir impounded by the Dorrs Pond Dam (completed 1934), built primarily for recreation on the Dorrs Pond; earth-type dam, 9 ft tall and 125 ft long.
- Surface area
- 25 ac
- Normal storage
- 60 ac-ft
- Max storage
- 118 ac-ft
- Drainage area
- 2.4 sq mi
- Hazard class
- High
- Owner
- CITY OF MANCHESTER
Source: USACE National Inventory of Dams, NID ID NH00518 · Operator website · Matched by proximity (0.16 km)
EPA Impairment Status
Dorrs Pond-Deep Spot is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit NHLAK700060802-01 · Official waterbody report · Matched by proximity (0.16 km)
County Ranking
Ranked #32 of 36 lakes in Hillsborough County
Nearby Lakes in Hillsborough County
Frequently asked questions about Dorrs Pond-Deep Spot
Where is Dorrs Pond-Deep Spot?
- Dorrs Pond-Deep Spot is a lake in Hillsborough County, New Hampshire. LakeQuality grades it D for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Dorrs Pond-Deep Spot?
- Dorrs Pond-Deep Spot in Hillsborough County, New Hampshire has a water quality grade of D (Nutrient-rich). Phosphorus: 27.7 µg/L. Chlorophyll-a (algae): 13.3 µg/L. Surface area: 25 acres.
Is Dorrs Pond-Deep Spot safe to swim in?
- Nutrients and algae run higher than average — check local advisories before swimming, and skip the water if you see scum. Dorrs Pond-Deep Spot has a water quality grade of D (Nutrient-rich). Algae concentration (chlorophyll-a) is 13.3 µg/L. Always check local health department advisories before swimming.
Are there boat ramps on Dorrs Pond-Deep Spot?
- Dorrs Pond-Deep Spot has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include West Side. Public access is listed as yes.
Explore Dorrs Pond-Deep Spot across LakeGrade
More New Hampshire Lake Rankings
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Top 25 by Secchi water clarity
Grade A/B + low algae filter
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Eutrophic Lakes in New Hampshire
Where this data comes from
25 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)
1111330025 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)
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
Named boat-access points from the USGS National Boat Ramps inventory