Middle Pea Porridge Pond-Deep Spot
Middle Pea Porridge Pond-Deep Spot in Carroll County, New Hampshire has a water quality grade of A (Excellent). Phosphorus: 9.1 µg/L. Chlorophyll-a (algae): 1.6 µg/L. Surface area: 46 acres.
- Area
- 46 acres
- Type
- Oligotrophic
Middle Pea Porridge Pond-Deep Spot is a 46-acre cold, clear oligotrophic lake in Carroll County, New Hampshire. Water quality is graded A based on 2 sampling years through 2025. Compared to the 19 other monitored lakes in Carroll County, Middle Pea Porridge Pond-Deep Spot ranks #5 for water quality.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled 2025-08-24. Grade methodology: LakeGrade methodology.
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Swimming Safety
Grade onlyLow algae
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.
Excellent for swimming, crystal clear water with minimal algae
Water Quality Grade: A (Excellent)
No clarity data. Phosphorus level: 9.1 µg/L. Chlorophyll-a: 1.6 µg/L. Trophic State Index: 36.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 9.1 µg/L | Good |
| Chlorophyll-a (Algae) | 1.6 µg/L | Good |
| Trophic State Index (TSI) | 36 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Middle Pea Porridge Pond-Deep Spot
Compare lakeside cabins, hotels, and vacation rentals near Middle Pea Porridge Pond-Deep Spot in Carroll 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.
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 46 acres |
No bathymetric survey has been published for Middle Pea Porridge Pond-Deep Spot, so its depth is not documented here.
Fishing Middle Pea Porridge Pond-Deep Spot
Reservoir Info (USACE NID)
Middle Pea Porridge Pond-Deep Spot is a man-made reservoir impounded by the Pea Porridge Pond Middle Little Dam (completed 1966), built primarily for recreation on the Pea Porridge Pond; earth-type dam, 17 ft tall and 175 ft long.
- Surface area
- 46 ac
- Normal storage
- 210 ac-ft
- Max storage
- 406 ac-ft
- Drainage area
- 2.74 sq mi
- Hazard class
- Significant
- Owner
- VILLAGE DISTRICT OF EIDELWEISS
Source: USACE National Inventory of Dams, NID ID NH00768 · Operator website · Matched by proximity (0.62 km)
EPA Impairment Status
Middle Pea Porridge 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 NHLAK600020303-06 · Official waterbody report · Matched by proximity (0.17 km)
County Ranking
Ranked #5 of 20 lakes in Carroll County
Nearby Lakes in Carroll County
Frequently asked questions about Middle Pea Porridge Pond-Deep Spot
Where is Middle Pea Porridge Pond-Deep Spot?
- Middle Pea Porridge Pond-Deep Spot is a lake in Carroll County, New Hampshire. LakeQuality grades it A for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Middle Pea Porridge Pond-Deep Spot?
- Middle Pea Porridge Pond-Deep Spot in Carroll County, New Hampshire has a water quality grade of A (Excellent). Phosphorus: 9.1 µg/L. Chlorophyll-a (algae): 1.6 µg/L. Surface area: 46 acres.
Is Middle Pea Porridge Pond-Deep Spot safe to swim in?
- Excellent for swimming, crystal clear water with minimal algae. Middle Pea Porridge Pond-Deep Spot has a water quality grade of A (Excellent). Algae concentration (chlorophyll-a) is 1.6 µg/L. Always check local health department advisories before swimming.
Explore Middle Pea Porridge 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 A Lakes in New Hampshire
Belknap County · Excellent
Belknap County · Excellent
Grafton County · Excellent
Strafford County · Excellent
Merrimack County · Excellent
Grafton County · Excellent
Oligotrophic Lakes in New Hampshire
Where this data comes from
62 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)
1111330062 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