Carroll County Lake Quality
New Hampshire, 22 lakes, average grade B (Good)
There are 22 graded lakes in Carroll County. The mix is varied enough that the county-level average tells you the broad strokes, not the choose-this-cabin specifics. With an average grade of B, Carroll County sits comfortably above the New Hampshire median.
The county's lakes lean shallow, which makes the grades sensitive to wind, sediment-resuspension, and any nutrient inputs from the watershed. The cleanest lake on the books is Berry Bay-Deep Spot Lake (A); the most-stressed is Balch Pond-Deep Spot (C).
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Quick Answers for Carroll County
Planning a trip? Check special fishing regulations for Berry Bay-Deep Spot Lake — or check the official New Hampshire fishing regulations.
All Lakes in Carroll County
22 lakes · 17 graded, 5 not rated17 graded lakes · 5 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| 1 | ABerry Bay-Deep Spot LakeCarroll | A | No recent samples | 8.8 µg/L | 2.1 µg/L | No recent samples | Not recorded |
| 2 | ABig Pea Porridge Pond-Deep SpotCarroll | A | No recent samples | 6.9 µg/L | 2.4 µg/L | No recent samples | Not recorded |
| 3 | ABroad Bay-Deep Spot LakeCarroll | A | No recent samples | 6.8 µg/L | 2.2 µg/L | No recent samples | Not recorded |
| 4 | ALeavitt Bay-Deep Spot LakeCarroll | A | No recent samples | 8.8 µg/L | 2.3 µg/L | No recent samples | Not recorded |
| 5 | ALower Beech Pond-Deep SpotCarroll | A | No recent samples | 10.1 µg/L | 1.2 µg/L | No recent samples | Not recorded |
| 6 | ALower Danforth Pond-Deep SpotCarroll | A | No recent samples | 12.5 µg/L | 3.6 µg/L | No recent samples | Not recorded |
| 7 | AMiddle Pea Porridge Pond-Deep SpotCarroll | A | No recent samples | 9.1 µg/L | 1.6 µg/L | No recent samples | Not recorded |
| 8 | AOssipee Lake-Deep SpotCarroll | A | No recent samples | 7 µg/L | 2 µg/L | No recent samples | Not recorded |
| 9 | BDuncan Lake-Deep SpotCarroll | B | No recent samples | 12 µg/L | No recent samples | No recent samples | Not recorded |
| 10 | BIntervale Pond-Deep SpotCarroll | B | No recent samples | 9.9 µg/L | No recent samples | No recent samples | Not recorded |
| 11 | BKusumpe Pond-Deep SpotCarroll | B | No recent samples | 9.9 µg/L | No recent samples | No recent samples | Not recorded |
| 12 | BMoores Pond-Deep SpotCarroll | B | No recent samples | 6.6 µg/L | 3.9 µg/L | No recent samples | Not recorded |
| 13 | BWhite Lake-Deep SpotCarroll | B | No recent samples | 8.5 µg/L | No recent samples | No recent samples | Not recorded |
| 14 | CBalch Pond-Deep SpotCarroll | C | No recent samples | 22.3 µg/L | No recent samples | No recent samples | Not recorded |
| 15 | CBearcamp Pond-Deep SpotCarroll | C | No recent samples | 11.9 µg/L | 5 µg/L | No recent samples | Not recorded |
| 16 | CGarland Pond-Deep SpotCarroll | C | No recent samples | 17.9 µg/L | 7.3 µg/L | No recent samples | Not recorded |
| 17 | CLees Pond-Deep SpotCarroll | C | No recent samples | 15.1 µg/L | 5.5 µg/L | No recent samples | Not recorded |
| NRConner PondCarroll | NR | 41 ft | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRLittle Lake-Deep SpotCarroll | NR | No recent samples | 5.5 µg/L | No recent samples | No recent samples | Not recorded | |
| NRLittle Pond-Deep SpotCarroll | NR | No recent samples | 21.2 µg/L | No recent samples | No recent samples | Not recorded | |
| NRMoores Pond-InletCarroll | NR | No recent samples | 9.2 µg/L | No recent samples | No recent samples | Not recorded | |
| NRRust PondCarroll | NR | 18 ft | No recent samples | No recent samples | No recent samples | Not recorded |
NR = not rated: the monitoring record does not meet the evidence bar for a grade. That is EPA Integrated Reporting Category 3 (insufficient information), not a failing grade. How grading works.
Lake Match
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Six questions — swimming, fishing, quiet, cabins, drive time — and a shortlist of graded lakes that fit, with the water quality behind each one.
Other Counties in New Hampshire
See how Carroll County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 49 states and 2 Canadian provinces.
Source: EPA National Aquatic Resource Surveys, 2026.