Middle Pea Porridge Pond-Deep Spot
Carroll County, New Hampshire46 acresView mapDirections
NHDES publishes the water-quality measurements for Middle Pea Porridge Pond-Deep Spot. Here is what has been measured.
- Oligotrophic
- Impaired · Mercury
Middle Pea Porridge Pond-Deep Spot in Carroll County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. Phosphorus: 9.1 µg/L. Chlorophyll-a (algae): 1.6 µg/L. Surface area: 46 acres.
Middle Pea Porridge Pond-Deep Spot is a 46-acre cold, clear oligotrophic lake in Carroll County, New Hampshire. 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. Methodology: how these readings are compared.
Swimming conditions
Readings onlyLow algae
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Middle Pea Porridge Pond-Deep Spot is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury, pH / acidity. Check local advisories before you swim.
Whether Middle Pea Porridge Pond-Deep Spot is safe to swim in today is a call for the New Hampshire Department of Environmental Services and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Middle Pea Porridge Pond-Deep Spot
These are the measurements NHDES publishes for Middle Pea Porridge Pond-Deep Spot, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data. Phosphorus 9.1 µg/L. Chlorophyll-a 1.6 µg/L. TSI 36.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | No reading How deep a black-and-white disk stays visible from the surface. Higher is clearer. | |
| Total phosphorus | 9.1µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | 1.6µg/L | Good GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 36 | Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Low nutrients, clear water. No reading is a swimming clearance.
Ask about Middle Pea Porridge Pond-Deep Spot
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
46 acres
No bathymetric survey has been published for Middle Pea Porridge Pond-Deep Spot, so its depth is not documented here.
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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
Designated uses not supporting: Aquatic life, Fish consumption.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit NHLAK600020303-06 · Official waterbody report
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. Its water-quality measurements are published by NHDES and shown on this page as reported.
What is the water quality of Middle Pea Porridge Pond-Deep Spot?
- Middle Pea Porridge Pond-Deep Spot in Carroll County, New Hampshire has water-quality measurements published by NHDES, shown here as reported. 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?
- Nutrient and algae readings are not a swimming clearance. Middle Pea Porridge Pond-Deep Spot is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury, pH / acidity. Check local advisories before you swim.
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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)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database