Big Eleven Lake
Wyandotte County, KansasView mapDirections
Nutrients and algae run well above the regional average.
- Hypereutrophic
- Impaired · Nutrients (phosphorus, nitrogen)
- #4 of 4 in the county
Big Eleven Lake in Wyandotte County, Kansas has a water quality grade of F (Algae-prone). Phosphorus: 124.4 µg/L. Chlorophyll-a (algae): 48.6 µg/L.
- Type
- Hypereutrophic
- Phosphorus
- 124.4 µg/L
- Chlorophyll-a
- 48.6 µg/L
- Trend
- ↓ Declining
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Stays near Big Eleven Lake
Compare lakeside cabins, hotels, and vacation rentals near Big Eleven Lake in Wyandotte 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 Big Eleven Lake are listed below.
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Big Eleven Lake is a highly nutrient-loaded hypereutrophic lake in Wyandotte County, Kansas. Water quality is graded F based on 3 sampling years through 2024. Overall water quality is declining over recent sampling years. Compared to the 3 other monitored lakes in Wyandotte County, Big Eleven Lake ranks #4 for water quality.
Source: EPA Water Quality Portal sampling records, KDHE, last sampled 2024-09-05. 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. Big Eleven Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
Water Quality Grade: F (Algae-prone)
No clarity data. Phosphorus 124.4 µg/L. Chlorophyll-a 48.6 µg/L. TSI 71. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 124.4 µg/L | Poor |
| Chlorophyll-a (Algae) | 48.6 µg/L | Poor |
| Trophic State Index (TSI) | 71 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Fishing Big Eleven Lake
Water Quality Trend: ↓ Declining
Based on 10 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | -0.015 m/yr | 4 |
| Phosphorus | ↓ Declining | +8.31 µg/L/yr | 10 |
| Chlorophyll-a | → Stable | -0.14 µg/L/yr | 10 |
EPA Impairment Status
Big Eleven Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit KS-LM067101 · Official waterbody report
County Ranking
Ranked #4 of 4 lakes in Wyandotte County
Nearby Lakes in Wyandotte County
Frequently asked questions about Big Eleven Lake
Where is Big Eleven Lake?
- Big Eleven Lake is a lake in Wyandotte County, Kansas. LakeQuality grades it F for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Big Eleven Lake?
- Big Eleven Lake in Wyandotte County, Kansas has a water quality grade of F (Algae-prone). Phosphorus: 124.4 µg/L. Chlorophyll-a (algae): 48.6 µg/L.
Is Big Eleven Lake safe to swim in?
- The F is nutrients and algae, not a swimming clearance. Big Eleven Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
Explore Big Eleven Lake across LakeQuality
More Kansas Lake Rankings
Other Grade F Lakes in Kansas
Hypereutrophic Lakes in Kansas
Where this data comes from
68 measurements from 1 monitoring station, 2012–2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- EPA R7
EPA_R7_WQX68 samples · 2012–2024
Analytical methods
- Nutrient Analysis
- Total Phosphorus After Block Digestion
- Chlorophyll a
- Fluorometric Analysis of Chlorophyll a (originally 2334.22A)
- 445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence
- Total Nitrogen Calculation
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.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database