Olathe Lake is a productive, nutrient-rich eutrophic lake in Johnson County, Kansas. Water quality is graded C based on 2 sampling years through 2018. Compared to the 18 other monitored lakes in Johnson County, Olathe Lake ranks #6 for water quality.
Source: EPA Water Quality Portal sampling records, Kansas DNR, last sampled 2018-09-17. Grade methodology: LakeGrade methodology.
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Swimming Safety
Generally safe for swimming, moderate water quality
Water Quality Grade: C, Fair
Very murky, less than 3.3 ft of visibility. Phosphorus level: 80 µg/L. Chlorophyll-a: 13 µg/L. Trophic State Index: 61.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3.3 ft | D |
| Phosphorus | 80 µg/L | D |
| Chlorophyll-a (Algae) | 13 µg/L | C |
| Trophic State Index (TSI) | 61 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Olathe Lake
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Fishing Olathe Lake
Location
County Ranking
Ranked #6 of 19 lakes in Johnson County
Cleaner Lakes Within 30 Miles
Olathe Lake holds Grade C. 3 nearby lakes hold higher grades.
- CNew Olathe LakeJohnson County · 0 mi · Higher overall water quality score
- CErnie Miller Park LakeJohnson County · 1.9 mi · Higher overall water quality score
- CLenexa LakeJohnson County · 6 mi · Higher overall water quality score
Nearby Lakes in Johnson County
Explore Olathe Lake across LakeGrade
More Kansas Lake Rankings
Other Grade C Lakes in Kansas
Eutrophic Lakes in Kansas
More records, surveys & data sources
Data Sources
Water quality data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2018-09-17
Monitoring stations: 1