Cass County Lake Quality
Missouri, 5 lakes, average grade F (Very Poor)
Only 5 lakes in Cass 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. Harrisonville City Lake (F) is the cleanest in the county.
Quick Answers for Cass County
Planning a trip? Check special fishing regulations for Harrisonville City Lake — or check the official Missouri fishing regulations.
All Lakes in Cass County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Harrisonville City Lake | F | 1.9 ft | 78.5 µg/L |
| 2 | Raintree Lake | F | 2.5 ft | 66.4 µg/L |
| 3 | Harrisonville Lake | F | 1.1 ft | 69 µg/L |
| 4 | North Lake | F | 1.6 ft | 152 µg/L |
| 5 | Lake Luna | F | 1.2 ft | 192.9 µg/L |
Other Counties in Missouri
See how Cass 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 Cass County
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Source: EPA National Aquatic Resource Surveys, 2026.