Johnson County Lake Quality
Missouri, 7 lakes, measured by Missouri DNR
Johnson County has 7 monitored 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. 3 of those lakes carry recent nutrient and algae readings. The county-level summary describes that subset, not every water body listed. Most monitored lakes in Johnson County carry favourable nutrient and algae readings for Missouri.
The county's lakes lean shallow, which makes the readings sensitive to wind, sediment-resuspension, and any nutrient inputs from the watershed. The cleanest measured lake is Lake Buteo.
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Quick Answers for Johnson County
Planning a trip? Check special fishing regulations for Lake Buteo — or check the official Missouri fishing regulations.
All Lakes in Johnson County
7 lakes · 3 ranked on readings, 4 without enough sampling3 lakes ranked on readings · 4 without enough sampling, hidden
| # | Lake | Clarity | Phosphorus | Algae | Trophic | Access |
|---|---|---|---|---|---|---|
| 1 | Lake ButeoJohnson | 5.6 ft | 20 µg/L | 4 µg/L | No recent samples | Not recorded |
| 2 | Rock Lake Village LakeJohnson | 4.3 ft | 16 µg/L | 4.8 µg/L | No recent samples | Not recorded |
| 3 | Hazel Hill Lake by DamJohnson | 2 ft | 59.3 µg/L | 28 µg/L | No recent samples | ✓ Public |
| Holden City LakeJohnson | No recent samples | No recent samples | No recent samples | No recent samples | ✓ Public | |
| Shirley LakeJohnson | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| Echo LakeJohnson | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded | |
| Rock Island LakeJohnson | No recent samples | No recent samples | No recent samples | No recent samples | Not recorded |
NR = no nutrient or algae reading on record. The measurements are published as the authority reports them. Where the data comes from.
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Source: the Missouri Department of Natural Resources. See data sources.