Sedan City North Lake
Chautauqua County, Kansas57 acresView mapDirections
KDHE publishes the water-quality measurements for Sedan City North Lake. Here is what has been measured.
- Impaired · Nutrients (phosphorus, nitrogen)
- 23 ft max depth
- Limited data
Sedan City North Lake in Chautauqua County, Kansas has water-quality measurements published by KDHE, shown here as reported. Water clarity: 3.6 ft visibility. Phosphorus: 26.5 µg/L. Chlorophyll-a (algae): 14.5 µg/L. Surface area: 57 acres.
Sedan City North Lake is a 57-acre lake in Chautauqua County, Kansas with an estimated average depth of about 23 feet.
Source: EPA Water Quality Portal sampling records, KDHE, last sampled 2015-08-31. Methodology: how these readings are compared.
Swimming conditions
No readingRecreation use not supported
Nutrient and algae readings are not a swimming clearance. Sedan City North Lake is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
Whether Sedan City North 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 North Lake
These are the measurements KDHE publishes for Sedan City North 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 3.6 ft. Phosphorus 26.5 µg/L. Chlorophyll-a 14.5 µg/L. TSI 56.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 3.6ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 26.5µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | 14.5µg/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. | 56 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Sedan City North Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
~23 ft est.
Surface area
57 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 North Lake.
Lake Size & Watershed
Watershed (drainage) area
5 sq mi
HydroLAKES / HydroSHEDS
Shoreline
1.3 mi
HydroLAKES / HydroSHEDS
Elevation
919 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 North Lake
Reservoir Info (USACE NID)
Sedan City North Lake is a man-made reservoir impounded by the Upper Dam (completed 1935), built primarily for water supply on the Deer Creek, 44 ft tall and 800 ft long.
- Surface area
- 57 ac
- Normal storage
- 826.5 ac-ft
- Max storage
- 1,249.5 ac-ft
- Drainage area
- 4.17 sq mi
- Hazard class
- Significant
- Owner
- SEDAN, CITY OF
Source: USACE National Inventory of Dams, NID ID KS02462 · Operator website · Matched by proximity (0.1 km)
EPA Impairment Status
Sedan City North Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Designated uses not supporting: Drinking water, Aquatic life, Recreation.
Source: EPA ATTAINS assessment unit KS-LM048601 · Official waterbody report
Nearby Lakes in Chautauqua County
Frequently asked questions about Sedan City North Lake
Where is Sedan City North Lake?
- Sedan City North 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 North Lake?
- Sedan City North Lake in Chautauqua County, Kansas has water-quality measurements published by KDHE, shown here as reported. Water clarity: 3.6 ft visibility. Phosphorus: 26.5 µg/L. Chlorophyll-a (algae): 14.5 µg/L. Surface area: 57 acres.
Is Sedan City North Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Sedan City North Lake is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
How deep is Sedan City North Lake?
- No published bathymetric survey covers Sedan City North Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 23 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 57 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
Impairment status from EPA ATTAINS 303(d) database
Lake size & watershed from HydroLAKES (HydroSHEDS)