Lucas County Lake Quality
Iowa, 4 lakes, average grade F (Very Poor)
Only 4 lakes in Lucas 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 average is F — the most-stressed bracket in our rubric. Most monitored lakes here show persistent nutrient loading and algal pressure.
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. Ellis Lake (F) is the cleanest in the county.
Quick Answers for Lucas County
Planning a trip? Check special fishing regulations for Ellis Lake — or check the official Iowa fishing regulations.
All Lakes in Lucas County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Ellis Lake | F | 2 ft | - |
| 2 | Morris Lake | F | 1.6 ft | - |
| 3 | Red Haw Lake | F | 3.1 ft | - |
| 4 | Williamson Pond Max Depth | F | 1.6 ft | - |
Other Counties in Iowa
See how Lucas 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 Lucas County
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Source: EPA National Aquatic Resource Surveys, 2026.