Eureka Lake
Greenwood County, KansasView mapDirections
KDHE publishes the water-quality measurements for Eureka Lake. Here is what has been measured.
- Impaired · Nutrients (phosphorus, nitrogen)
- 32 ft max depth
- Limited data
Eureka Lake in Greenwood County, Kansas has water-quality measurements published by KDHE, shown here as reported. Water clarity: 2.4 ft visibility. Phosphorus: 40.5 µg/L. Chlorophyll-a (algae): 18 µg/L.
Eureka Lake is a lake in Greenwood County, Kansas with an estimated average depth of about 32 feet.
Source: EPA Water Quality Portal sampling records, KDHE, last sampled 2014-08-06. Methodology: how these readings are compared.
Swimming conditions
No readingRecreation use not supported
Nutrient and algae readings are not a swimming clearance. Eureka Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for nutrients (phosphorus, nitrogen), sediment / turbidity. Check local advisories before you swim.
Whether Eureka 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 Eureka Lake
These are the measurements KDHE publishes for Eureka 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 40.5 µg/L. Chlorophyll-a 18 µg/L. TSI 60.
| 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 | 40.5µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | 18µg/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. | 60 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Eureka Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
~32 ft est.
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Kansas has not published bathymetry for Eureka Lake.
Lake Size & Watershed
Watershed (drainage) area
16 sq mi
HydroLAKES / HydroSHEDS
Surface area
215 acres
HydroLAKES / HydroSHEDS
Shoreline
4.3 mi
HydroLAKES / HydroSHEDS
Elevation
1,158 ft
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
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Fishing Eureka Lake
Reservoir Info (USACE NID)
Eureka Lake is a man-made reservoir impounded by the Eureka Lake Dam (Bachelor Cr) (completed 1939), built primarily for water supply on the Bachelor Creek; earth-type dam, 66 ft tall and 1,600 ft long.
- Normal storage
- 3,690 ac-ft
- Max storage
- 6,000 ac-ft
- Drainage area
- 15.37 sq mi
- Hazard class
- Low
- Owner
- EUREKA, CITY OF
All listed purposes: Water Supply;Recreation.
Source: USACE National Inventory of Dams, NID ID KS02479 · Operator website · Matched by proximity (0.44 km)
EPA Impairment Status
Eureka Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).
Causes of impairment
Designated uses not supporting: Drinking water, Aquatic life, Recreation.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit KS-LM040201 · Official waterbody report
Nearby Lakes in Greenwood County
Frequently asked questions about Eureka Lake
Where is Eureka Lake?
- Eureka Lake is a lake in Greenwood County, Kansas. Its water-quality measurements are published by KDHE and shown on this page as reported.
What is the water quality of Eureka Lake?
- Eureka Lake in Greenwood County, Kansas has water-quality measurements published by KDHE, shown here as reported. Water clarity: 2.4 ft visibility. Phosphorus: 40.5 µg/L. Chlorophyll-a (algae): 18 µg/L.
Is Eureka Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Eureka Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for nutrients (phosphorus, nitrogen), sediment / turbidity. Check local advisories before you swim.
How deep is Eureka Lake?
- No published bathymetric survey covers Eureka Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 32 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
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Where this data comes from
5 measurements from 1 monitoring station, 2014. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Kansas Department Of Health And Environment
21KAN001_WQX5 samples · 2014
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.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database
Lake size & watershed from HydroLAKES (HydroSHEDS)