Tower Hill Pond-Deep Spot
Tower Hill Pond-Deep Spot in Rockingham County, New Hampshire has a water quality grade of C (Fair). Phosphorus: 17.6 µg/L. Surface area: 202 acres.
- Area
- 202 acres
- Type
- Mesotrophic
- Public access
- Yes
Tower Hill Pond-Deep Spot is a 202-acre mesotrophic lake in Rockingham County, New Hampshire. Water quality is graded C based on 1 sampling years through 2025. Limited fish-species data available. Public access is available with 1 public boat landing. Compared to the 50 other monitored lakes in Rockingham County, Tower Hill Pond-Deep Spot ranks #43 for water quality.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2025-07-15. Grade methodology: LakeGrade methodology.
Watch Tower Hill 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.
Generally safe for swimming, moderate water quality
Water Quality Grade: C (Fair)
No clarity data. Phosphorus level: 17.6 µg/L. Trophic State Index: 46.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 17.6 µg/L | Fair |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 46 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Tower Hill Pond-Deep Spot
Compare lakeside cabins, hotels, and vacation rentals near Tower Hill Pond-Deep Spot in Rockingham 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 Tower Hill 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 | 202 acres |
| Public Access | Yes |
No bathymetric survey has been published for Tower Hill Pond-Deep Spot, so its depth is not documented here.
Recreation & Access
- Clair's LandingPublic
Named access points from the USGS National Boat Ramps inventory, snapped within 5 km. More lakes with boat ramps
Fishing Tower Hill Pond-Deep Spot
Reservoir Info (USACE NID)
Tower Hill Pond-Deep Spot is a man-made reservoir impounded by the Tower Hill Pond Dam (completed 1938), built primarily for water supply on the Maple Falls Brook; earth-type dam, 35 ft tall and 1,220 ft long.
- Surface area
- 202 ac
- Normal storage
- 3,960 ac-ft
- Max storage
- 5,020 ac-ft
- Drainage area
- 12.5 sq mi
- Hazard class
- High
- Owner
- MANCHESTER WATER WORKS
Source: USACE National Inventory of Dams, NID ID NH00219 · Operator website · Matched by proximity (0.29 km)
EPA Impairment Status
Tower 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
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit NHLAK700060701-04 · Official waterbody report · Matched by proximity (0.53 km)
County Ranking
Ranked #43 of 51 lakes in Rockingham County
Nearby Lakes in Rockingham County
Frequently asked questions about Tower Hill Pond-Deep Spot
Where is Tower Hill Pond-Deep Spot?
- Tower Hill Pond-Deep Spot is a lake in Rockingham County, New Hampshire. LakeQuality grades it C for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Tower Hill Pond-Deep Spot?
- Tower Hill Pond-Deep Spot in Rockingham County, New Hampshire has a water quality grade of C (Fair). Phosphorus: 17.6 µg/L. Surface area: 202 acres.
Is Tower Hill Pond-Deep Spot safe to swim in?
- Generally safe for swimming, moderate water quality. Tower Hill Pond-Deep Spot has a water quality grade of C (Fair). Always check local health department advisories before swimming.
Are there boat ramps on Tower Hill Pond-Deep Spot?
- Tower Hill Pond-Deep Spot has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Clair's Landing. Public access is listed as yes.
Explore Tower Hill 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 C Lakes in New Hampshire
Mesotrophic Lakes in New Hampshire
Where this data comes from
7 measurements from 1 monitoring station, 2024–2025. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- New Hampshire Department Of Environmental Services (BEACH)
111133007 samples · 2024–2025
Analytical methods
- 10-115-01-1 F ~ LACHAT; Total Phosphorus- Manual persulfate digest
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