Sedan City South Lake
Chautauqua County, Kansas75 acresView mapDirections
KDHE publishes the water-quality measurements for Sedan City South Lake. Here is what has been measured.
- 22 ft max depth
- Limited data
Sedan City South Lake in Chautauqua County, Kansas has water-quality measurements published by KDHE, shown here as reported. Water clarity: 4.9 ft visibility. Phosphorus: 20 µg/L. Chlorophyll-a (algae): 8.5 µg/L. Surface area: 75 acres.
Sedan City South Lake is a 75-acre lake in Chautauqua County, Kansas with an estimated average depth of about 22 feet.
Source: EPA Water Quality Portal sampling records, KDHE, last sampled 2015-08-31. 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 Sedan City South 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 Sedan City South Lake
These are the measurements KDHE publishes for Sedan City South Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Murky, only visible to about 4.9 ft. Phosphorus 20 µg/L. Chlorophyll-a 8.5 µg/L. TSI 51.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 4.9ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 20µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | 8.5µg/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. | 51 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Sedan City South Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
~22 ft est.
Surface area
75 acres
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Kansas has not published bathymetry for Sedan City South Lake.
Lake Size & Watershed
Watershed (drainage) area
7 sq mi
HydroLAKES / HydroSHEDS
Shoreline
1.7 mi
HydroLAKES / HydroSHEDS
Elevation
866 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 Sedan City South Lake
Reservoir Info (USACE NID)
Sedan City South Lake is a man-made reservoir impounded by the Dd No 6-28 Lower Dam (Sedan City Lake) (completed 1965), built primarily for flood risk reduction on the Deer Creek; earth-type dam, 60 ft tall and 1,585 ft long.
- Surface area
- 75 ac
- Normal storage
- 780 ac-ft
- Max storage
- 3,250 ac-ft
- Drainage area
- 7.03 sq mi
- Hazard class
- High
- Owner
- SEDAN, CITY OF
All listed purposes: Flood Risk Reduction;Water Supply.
Source: USACE National Inventory of Dams, NID ID KS02451 · Operator website · Matched by proximity (0.17 km)
Nearby Lakes in Chautauqua County
Frequently asked questions about Sedan City South Lake
Where is Sedan City South Lake?
- Sedan City South Lake is a lake in Chautauqua County, Kansas. Its water-quality measurements are published by KDHE and shown on this page as reported.
What is the water quality of Sedan City South Lake?
- Sedan City South Lake in Chautauqua County, Kansas has water-quality measurements published by KDHE, shown here as reported. Water clarity: 4.9 ft visibility. Phosphorus: 20 µg/L. Chlorophyll-a (algae): 8.5 µg/L. Surface area: 75 acres.
Is Sedan City South Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Sedan City South Lake?
- No published bathymetric survey covers Sedan City South Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 22 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate. The lake covers 75 acres.
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Where this data comes from
5 measurements from 1 monitoring station, 2015. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Kansas Department Of Health And Environment
21KAN001_WQX5 samples · 2015
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
Lake size & watershed from HydroLAKES (HydroSHEDS)