Blaine County Lake Quality
Idaho, 4 lakes, average grade C (Fair)
Blaine County has 4 graded 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. Blaine County averages to a C. The distribution behind that average matters more than the letter: a few stressed lakes versus many decent ones can produce the same average as the inverse.
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. Nla Lake (A) is the cleanest in the county.
Quick Answers for Blaine County
Planning a trip? Check special fishing regulations for Nla Lake — or check the official Idaho fishing regulations.
All Lakes in Blaine County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Nla Lake | A | 29.9 ft | 14.6 µg/L |
| 2 | Littlewood Lake | B | 12.5 ft | 26 µg/L |
| 3 | Nla Lake | C | 7.9 ft | 44000 µg/L |
| 4 | Little Wood Reservoir | D | - | 65 µg/L |
Other Counties in Idaho
See how Blaine County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 34 states.
Where to stay near Blaine County
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Source: EPA National Aquatic Resource Surveys, 2026.