Tomahawk Creek Park Lake
Johnson County, KansasView mapDirections
Nutrients and algae run well above the regional average.
- Hypereutrophic
- #9 of 13 in the county
Tomahawk Creek Park Lake in Johnson County, Kansas has a water quality grade of F (Algae-prone). Phosphorus: 162.1 µg/L. Chlorophyll-a (algae): 45.9 µg/L.
- Type
- Hypereutrophic
- Phosphorus
- 162.1 µg/L
- Chlorophyll-a
- 45.9 µg/L
- Trend
- → Stable
Stays via Stay22
Stays near Tomahawk Creek Park Lake
Compare lakeside cabins, hotels, and vacation rentals near Tomahawk Creek Park Lake in Johnson County, Kansas — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water. The water-quality grade measures nutrients and algae, not lodging — cabins and rentals around Tomahawk Creek Park Lake are listed below.
Top-rated places to stay near Tomahawk Creek Park Lake
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Watch Tomahawk Creek Park Lake’s letter
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Tomahawk Creek Park Lake is a highly nutrient-loaded hypereutrophic lake in Johnson County, Kansas. Water quality is graded F based on 3 sampling years through 2021. Phosphorus level is declining over recent sampling years. Compared to the 12 other monitored lakes in Johnson County, Tomahawk Creek Park Lake ranks #9 for water quality.
Source: EPA Water Quality Portal sampling records, KDHE, last sampled 2021-09-14. Grade methodology: LakeQuality methodology.
Swimming Safety
Grade onlyAlgae risk
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
The F is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Water Quality Grade: F (Algae-prone)
No clarity data. Phosphorus 162.1 µg/L. Chlorophyll-a 45.9 µg/L. TSI 73. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 162.1 µg/L | Poor |
| Chlorophyll-a (Algae) | 45.9 µg/L | Poor |
| Trophic State Index (TSI) | 73 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Fishing Tomahawk Creek Park Lake
Water Quality Trend: → Stable
Based on 9 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Phosphorus | ↓ Declining | +32.38 µg/L/yr | 9 |
| Chlorophyll-a | ↑ Improving | -5.55 µg/L/yr | 9 |
County Ranking
Ranked #9 of 13 lakes in Johnson County
Nearby Lakes With Higher Grades
Tomahawk Creek Park Lake holds Grade F. One nearby lake has a higher nutrient-and-algae grade — useful for a swim day, not a reason to skip lodging here.
See full comparison →Nearby Lakes in Johnson County
Frequently asked questions about Tomahawk Creek Park Lake
Where is Tomahawk Creek Park Lake?
- Tomahawk Creek Park Lake is a lake in Johnson County, Kansas. LakeQuality grades it F for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Tomahawk Creek Park Lake?
- Tomahawk Creek Park Lake in Johnson County, Kansas has a water quality grade of F (Algae-prone). Phosphorus: 162.1 µg/L. Chlorophyll-a (algae): 45.9 µg/L.
Is Tomahawk Creek Park Lake safe to swim in?
- The F is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Explore Tomahawk Creek Park Lake across LakeQuality
More Kansas Lake Rankings
Other Grade F Lakes in Kansas
Hypereutrophic Lakes in Kansas
Where this data comes from
157 measurements from 3 monitoring stations, 2012–2021. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- EPA R7
EPA_R7_WQX157 samples · 2012–2021
Analytical methods
- Nutrient Analysis
- Chlorophyll a
- Fluorometric Analysis of Chlorophyll a (originally 2334.22A)
Monitoring station identifiers (3)
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.