Bonner County Lake Quality
Idaho, 7 lakes, average grade C (Fair)
Only 7 lakes in Bonner 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. Bonner 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.
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 Nla Lake (A); the most-stressed is Nla Lake (D).
Quick Answers for Bonner County
Planning a trip? Check special fishing regulations for Nla Lake — or check the official Idaho fishing regulations.
All Lakes in Bonner County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Nla Lake | A | 11 ft | 6.6 µg/L |
| 2 | Nla Lake | B | 6.9 ft | 12 µg/L |
| 3 | Nla Lake | C | 8.4 ft | 29000 µg/L |
| 4 | Nla Lake | C | 8.2 ft | 118000 µg/L |
| 5 | Nla Lake | C | 3.9 ft | 30.9 µg/L |
| 6 | Nla Lake | C | - | 65000 µg/L |
| 7 | Nla Lake | D | 6.5 ft | 43000 µg/L |
Other Counties in Idaho
See how Bonner 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 Bonner County
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Source: EPA National Aquatic Resource Surveys, 2026.