Scott County Lake Quality
Iowa, 5 lakes, average grade C (Fair)
Only 5 lakes in Scott 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. Scott 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 Lambach Lake (B); the most-stressed is Lost Grove Lake (C).
Quick Answers for Scott County
Planning a trip? Check special fishing regulations for Lambach Lake — or check the official Iowa fishing regulations.
All Lakes in Scott County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Lambach Lake | B | 7.9 ft | - |
| 2 | Railroad Lake | C | 5.1 ft | - |
| 3 | Lost Grove Lake | C | 3.9 ft | - |
| 4 | Blue Grass Lake | C | 4.5 ft | - |
| 5 | Lake of the Hills | C | 5.1 ft | - |
Other Counties in Iowa
See how Scott 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 Scott County
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Source: EPA National Aquatic Resource Surveys, 2026.