Harantis Lake-Deep Spot
Harantis Lake-Deep Spot in Rockingham County, New Hampshire has a water quality grade of C (Fair). Phosphorus: 20.9 µg/L. Chlorophyll-a (algae): 4.2 µg/L. Surface area: 15.4 acres.
- Area
- 15 acres
- Type
- Mesotrophic
Harantis Lake-Deep Spot is a 15-acre mesotrophic lake in Rockingham County, New Hampshire. Water quality is graded C based on 1 sampling years through 2024. Compared to the 50 other monitored lakes in Rockingham County, Harantis Lake-Deep Spot ranks #33 for water quality.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2024-07-24. Grade methodology: LakeGrade methodology.
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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: 20.9 µg/L. Chlorophyll-a: 4.2 µg/L. Trophic State Index: 46.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 20.9 µg/L | Fair |
| Chlorophyll-a (Algae) | 4.2 µg/L | Not graded |
| Trophic State Index (TSI) | 46 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Harantis Lake-Deep Spot
Compare lakeside cabins, hotels, and vacation rentals near Harantis Lake-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 Harantis Lake-Deep Spot
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 15 acres |
No bathymetric survey has been published for Harantis Lake-Deep Spot, so its depth is not documented here.
Fishing Harantis Lake-Deep Spot
Reservoir Info (USACE NID)
Harantis Lake-Deep Spot is a man-made reservoir impounded by the Harantis Lake Dam (completed 1930), built primarily for recreation on the Beaver Brook; concrete-type dam, 14 ft tall and 150 ft long.
- Surface area
- 15.4 ac
- Normal storage
- 77.7 ac-ft
- Max storage
- 145 ac-ft
- Drainage area
- 2.22 sq mi
- Hazard class
- Significant
- Owner
- HARANTIS LAKE PROPERTY OWNERS ASSOC
Source: USACE National Inventory of Dams, NID ID NH00337 · Operator website · Matched by proximity (0.35 km)
EPA Impairment Status
Harantis Lake-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 NHIMP700061203-01 · Official waterbody report · Matched by proximity (0.15 km)
County Ranking
Ranked #33 of 51 lakes in Rockingham County
Nearby Lakes in Rockingham County
Frequently asked questions about Harantis Lake-Deep Spot
Where is Harantis Lake-Deep Spot?
- Harantis Lake-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 Harantis Lake-Deep Spot?
- Harantis Lake-Deep Spot in Rockingham County, New Hampshire has a water quality grade of C (Fair). Phosphorus: 20.9 µg/L. Chlorophyll-a (algae): 4.2 µg/L. Surface area: 15.4 acres.
Is Harantis Lake-Deep Spot safe to swim in?
- Generally safe for swimming, moderate water quality. Harantis Lake-Deep Spot has a water quality grade of C (Fair). Algae concentration (chlorophyll-a) is 4.2 µg/L. Always check local health department advisories before swimming.
Explore Harantis Lake-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
4 measurements from 1 monitoring station, 2021–2024. Retrieved from the EPA Water Quality Portal on 2026-08-21.
Collected and reported by
- New Hampshire Department Of Environmental Services (BEACH)
111133004 samples · 2021–2024
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