Lenexa Lake
Johnson County, Kansas33 acresView mapDirections
KDHE publishes the water-quality measurements for Lenexa Lake. Here is what has been measured.
- Eutrophic
Lenexa Lake in Johnson County, Kansas has water-quality measurements published by KDHE, shown here as reported. Phosphorus: 29 µg/L. Chlorophyll-a (algae): 16.2 µg/L. Surface area: 33 acres.
Lenexa Lake is a 33-acre productive, nutrient-rich eutrophic lake in Johnson County, Kansas. Overall water quality is declining over recent sampling years. Compared to the 12 other monitored lakes in Johnson County, Lenexa Lake ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, KDHE, last sampled 2021-09-14. Methodology: how these readings are compared.
Swimming conditions
Readings onlyAlgae risk
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Lenexa 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 Lenexa Lake
These are the measurements KDHE publishes for Lenexa 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. Phosphorus 29 µg/L. Chlorophyll-a 16.2 µg/L. TSI 55.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | No reading How deep a black-and-white disk stays visible from the surface. Higher is clearer. | |
| Total phosphorus | 29µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | 16.2µg/L | Fair GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 55 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Lenexa Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
33 acres
No bathymetric survey has been published for Lenexa Lake, so its depth is not documented here.
Stays via Stay22
Stays near Lenexa Lake
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Fishing Lenexa Lake
Water Quality Trend: Worsening
Based on 8 years of monitoring (2012–2021).
Phosphorus
Worsening+20.94 µg/L/yr8 years
Chlorophyll-a
Worsening+0.91 µg/L/yr8 years
Reservoir Info (USACE NID)
Lenexa Lake is a man-made reservoir impounded by the Lake Lenexa (completed 2006), built primarily for recreation on the Coon Creek-Tr; earth-type dam, 46 ft tall and 740 ft long.
- Surface area
- 33 ac
- Normal storage
- 570 ac-ft
- Max storage
- 1,020 ac-ft
- Drainage area
- 2.19 sq mi
- Hazard class
- High
- Owner
- LENEXA, CITY OF
Source: USACE National Inventory of Dams, NID ID KS09270 · Operator website
Nearby Lakes in Johnson County
Frequently asked questions about Lenexa Lake
Where is Lenexa Lake?
- Lenexa 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 Lenexa Lake?
- Lenexa Lake in Johnson County, Kansas has water-quality measurements published by KDHE, shown here as reported. Phosphorus: 29 µg/L. Chlorophyll-a (algae): 16.2 µg/L. Surface area: 33 acres.
Is Lenexa Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Explore Lenexa Lake across LakeQuality
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Eutrophic Lakes in Kansas
Where this data comes from
43 measurements from 1 monitoring station, 2012–2021. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- EPA R7
EPA_R7_WQX43 samples · 2012–2021
Analytical methods
- Nutrient Analysis
- Chlorophyll a
- Fluorometric Analysis of Chlorophyll a (originally 2334.22A)
Monitoring station identifiers (1)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.