Lenexa City Lake
Johnson County, Kansas33 acresView mapDirections
KDHE publishes the water-quality measurements for Lenexa City Lake. Here is what has been measured.
- Limited data
Lenexa City Lake in Johnson County, Kansas has water-quality measurements published by KDHE, shown here as reported. Water clarity: 2.4 ft visibility. Phosphorus: 71 µg/L. Chlorophyll-a (algae): 40 µg/L. Surface area: 33 acres.
Lenexa City Lake is a 33-acre lake in Johnson County, Kansas. Overall water quality is declining over recent sampling years.
Source: EPA Water Quality Portal sampling records, KDHE, last sampled 2017-08-28. Methodology: how these readings are compared.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Lenexa City 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 City Lake
These are the measurements KDHE publishes for Lenexa City Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Very murky, less than 2.4 ft of visibility. Phosphorus 71 µg/L. Chlorophyll-a 40 µg/L. TSI 66.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 2.4ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 71µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | 40µg/L | Measured, not scored The green pigment in algae — a direct measure of how much algae is in the water. |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 66 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Lenexa City 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 City Lake, so its depth is not documented here.
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Fishing Lenexa City 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 City 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 · Matched by proximity (0.1 km)
Nearby Lakes in Johnson County
Frequently asked questions about Lenexa City Lake
Where is Lenexa City Lake?
- Lenexa City 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 City Lake?
- Lenexa City Lake in Johnson County, Kansas has water-quality measurements published by KDHE, shown here as reported. Water clarity: 2.4 ft visibility. Phosphorus: 71 µg/L. Chlorophyll-a (algae): 40 µg/L. Surface area: 33 acres.
Is Lenexa City Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
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Where this data comes from
5 measurements from 1 monitoring station, 2017. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Kansas Department Of Health And Environment
21KAN001_WQX5 samples · 2017
Analytical methods
- Depth, Secchi disk depth
- Phosphorus by Colorimetry
- 10200 H ~ Chlorophyll a-b-c Determination
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.