Olathe Lake
Johnson County, Kansas61 acresView mapDirections
No nutrient or algae sampling on record from KDHE for this lake.
- Impaired · Nutrients (phosphorus, nitrogen)
- 14 ft max depth
Olathe Lake in Johnson County, Kansas has water-quality measurements published by KDHE, shown here as reported. Maximum depth: 14 ft. Surface area: 61 acres.
Olathe Lake is a 61-acre lake in Johnson County, Kansas with a maximum depth of 14 feet (6-foot average).
Source: EPA Water Quality Portal sampling records, KDHE. Methodology: how these readings are compared.
Swimming conditions
No readingRecreation use not supported
Nutrient and algae readings are not a swimming clearance. Olathe Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
Whether Olathe Lake is safe to swim in today is a call for the Kansas Department of Health and Environment and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Olathe Lake
These are the measurements KDHE publishes for Olathe Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data. TSI undefined.
Ask about Olathe Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
14 ft
Average depth
6.2 ft
Surface area
61 acres
Shoreline
2.7 mi
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Fishing Olathe Lake
EPA Impairment Status
Olathe Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).
Causes of impairment
Designated uses not supporting: Drinking water, Aquatic life, Recreation.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit KS-LM061601 · Official waterbody report
Nearby Lakes in Johnson County
Frequently asked questions about Olathe Lake
Where is Olathe Lake?
- Olathe Lake is a lake in Johnson County, Kansas. Its water-quality measurements are published by KDHE and shown on this page as reported.
What is the water quality of Olathe Lake?
- Olathe Lake in Johnson County, Kansas has water-quality measurements published by KDHE, shown here as reported. Maximum depth: 14 ft. Surface area: 61 acres.
Is Olathe Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Olathe Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
How deep is Olathe Lake?
- Olathe Lake has a maximum depth of 14 feet and an average depth of 6.2 feet. The lake covers 61 acres.
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Where this data comes from
Measurements for Olathe Lake come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database