Walsh County Lake Quality
North Dakota, 7 lakes, average grade C (Fair)
Walsh County has 7 monitored lakes — a thin enough sample that one or two stressed lakes can move the county average noticeably. Use the per-lake pages below for what actually matters. 1 of those lake carry an A–F grade. The county-level summary describes that subset, not every water body listed. The county average is C — the middle of the rubric, with one or two lakes pulling the average up or down depending on year.
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 Homme Dam Lake (C); the most-stressed is Homme Dam Lake (C).
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Quick Answers for Walsh County
Planning a trip? Check special fishing regulations for Homme Dam Lake — or check the official North Dakota fishing regulations.
All Lakes in Walsh County
7 lakes · 1 graded, 6 not rated1 graded lake · 6 not rated, hidden
| # | Lake | Grade | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|---|
| 1 | CHomme Dam LakeWalsh | C | 5.7 ft | 264 µg/L | 4 µg/L | No recent samples | ✓ Public |
| NRBylin Dam LakeWalsh | NR | 7.2 ft | No recent samples | No recent samples | No recent samples | ✓ Public | |
| NRFairdale SloughWalsh | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRSalt LakeWalsh | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRNorth Salt LakeWalsh | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRWaterloo LakeWalsh | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| NRLake ArdochWalsh | NR | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded |
NR = not rated: there is not enough recent sampling to support a letter. That is EPA Integrated Reporting Category 3 (insufficient information), not a failing grade. How grading works.
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Other Counties in North Dakota
See how Walsh County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all United States (49 states), Canada (Ontario, Québec, Nova Scotia, British Columbia and Newfoundland and Labrador), and 38 other country hubs..
Source: EPA National Aquatic Resource Surveys, 2026.