Lenexa City Lake
Johnson County, Kansas33 acresView mapDirections
Not enough samples to grade — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). No letter yet. Here is what we do have.
- Limited data
Lenexa City Lake in Johnson County, Kansas is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 2.4 ft visibility. Phosphorus: 71 µg/L. Chlorophyll-a (algae): 40 µg/L. Surface area: 33 acres.
- Clarity
- 2.4 ft
- Area
- 33 acres
- Phosphorus
- 71 µg/L
- Chlorophyll-a
- 40 µg/L
- Trend
- ↓ Declining
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Watch Lenexa City Lake’s letter
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Why Lenexa City Lake has no grade
We grade a lake only when the monitoring record supports a letter: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Lenexa City Lake, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded water clarity, phosphorus and algae (chlorophyll-a).
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by KDHE and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
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. Grade methodology: LakeQuality methodology.
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for Lenexa City Lake
These readings exist but are not enough for an A–F grade — see why.
Very murky, less than 2.4 ft of visibility. Phosphorus 71 µg/L. Chlorophyll-a 40 µg/L. TSI 66.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.4 ft | Not graded |
| Phosphorus | 71 µg/L | Not graded |
| Chlorophyll-a (Algae) | 40 µg/L | Not graded |
| Trophic State Index (TSI) | 66 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 33 acres |
No bathymetric survey has been published for Lenexa City Lake, so its depth is not documented here.
Fishing Lenexa City Lake
Water Quality Trend: ↓ Declining
Based on 8 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Phosphorus | ↓ Declining | +20.94 µg/L/yr | 8 |
| Chlorophyll-a | ↓ Declining | +0.91 µg/L/yr | 8 |
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)
Graded lakes near Lenexa City Lake
Lenexa City Lake has no grade, but these lakes within a short drive do.
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. LakeQuality has not rated this lake (UNRATED) — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years).
What is the water quality grade for Lenexa City Lake?
- Lenexa City Lake in Johnson County, Kansas is not rated for water quality — its monitoring record does not meet the evidence bar. 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?
- The letter is not a swimming clearance. Check local advisories before you swim.
Explore Lenexa City Lake across LakeQuality
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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)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.