Adams County Lake Quality
North Dakota, 2 lakes, average grade D (Poor)
Only 2 lakes in Adams County carry an active grade. The county-level summary is therefore representative of those specific lakes, not necessarily of every water body in the county. The county-wide average grade is D — water quality issues are persistent across most of the monitored basins. 1 lakes fall into the F bracket outright.
Most of the county's monitored lakes are shallow — under 50 feet — which means wind keeps the water column mixed all summer and sediment-bound phosphorus releases back into the surface layer whenever the bottom is disturbed. North Lemmon Lake (B) is the cleanest in the county.
Quick Answers for Adams County
Planning a trip? Check special fishing regulations for North Lemmon Lake, whether the fish are safe to eat, and the best times to fish — or check the official North Dakota fishing regulations.
Fishing in Adams County
All Lakes in Adams County
| Rank | Lake | Grade | Clarity | Max Depth | Phosphorus |
|---|---|---|---|---|---|
| 1 | North Lemmon Lake | B | 5.7 ft | 31.4 ft | - |
| 2 | Mirror Lake | F | 2.1 ft | 16.1 ft | - |
Other Counties in North Dakota
See how Adams County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 15 states.
Where to stay near Adams County
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Source: EPA National Aquatic Resource Surveys, 2026.