Madison City Lake
Greenwood County, Kansas115 acresView mapDirections
Clarity, phosphorus, and algae sit in the clean band for this region.
- Eutrophic
- #2 of 3 in the county
- 32 ft max depth
- Limited data
Madison City Lake in Greenwood County, Kansas has a water quality grade of B (Good). Water clarity: 4.1 ft visibility. Phosphorus: 20 µg/L. Chlorophyll-a (algae): 7.5 µg/L. Surface area: 114.6 acres.
- Clarity
- 4.1 ft
- Max depth
- ~32 ft est.
- Area
- 115 acres
- Type
- Eutrophic
- Phosphorus
- 20 µg/L
- Chlorophyll-a
- 7.5 µg/L
- Trend
- ↑ Improving
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Watch Madison City Lake’s letter
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Madison City Lake is a 115-acre productive, nutrient-rich eutrophic lake in Greenwood County, Kansas with an estimated average depth of about 32 feet. Water quality is graded B based on 1 sampling years through 2018. Overall water quality is improving over recent sampling years. Compared to the 2 other monitored lakes in Greenwood County, Madison City Lake ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, KDHE, last sampled 2018-06-04. Grade methodology: LakeQuality methodology.
Swimming Safety
Grade onlyLimited data
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 B is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Water Quality Grade: B (Good)
Murky, only visible to about 4.1 ft. Phosphorus 20 µg/L. Chlorophyll-a 7.5 µg/L. TSI 51. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4.1 ft | Not graded |
| Phosphorus | 20 µg/L | Not graded |
| Chlorophyll-a (Algae) | 7.5 µg/L | Good |
| Trophic State Index (TSI) | 51 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~32 ft est. |
| Average Depth | ~8 ft est. |
| Surface Area | 115 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 Madison City Lake.
Lake Size & Watershed
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.
Fishing Madison City Lake
Water Quality Trend: ↑ Improving
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.03 m/yr | 2 |
| Phosphorus | ↓ Declining | +2 µg/L/yr | 2 |
| Chlorophyll-a | ↑ Improving | -0.4 µg/L/yr | 2 |
Reservoir Info (USACE NID)
Madison City Lake is a man-made reservoir impounded by the Dam No 7-8 (completed 1970), built primarily for flood risk reduction on the Holderman Creek-Tr; earth-type dam, 58 ft tall and 1,870 ft long.
- Surface area
- 114.6 ac
- Normal storage
- 1,357 ac-ft
- Max storage
- 3,517 ac-ft
- Hazard class
- Significant
- Owner
- MADISON, CITY OF
All listed purposes: Flood Risk Reduction;Water Supply.
Source: USACE National Inventory of Dams, NID ID KS02309 · Operator website · Matched by proximity (0.12 km)
County Ranking
Ranked #2 of 3 lakes in Greenwood County
Nearby Lakes in Greenwood County
Frequently asked questions about Madison City Lake
Where is Madison City Lake?
- Madison City Lake is a lake in Greenwood County, Kansas. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Madison City Lake?
- Madison City Lake in Greenwood County, Kansas has a water quality grade of B (Good). Water clarity: 4.1 ft visibility. Phosphorus: 20 µg/L. Chlorophyll-a (algae): 7.5 µg/L. Surface area: 114.6 acres.
Is Madison City Lake safe to swim in?
- The B is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
How deep is Madison City Lake?
- No published bathymetric survey covers Madison City 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. The lake covers 114.6 acres.
Explore Madison City Lake across LakeQuality
More Kansas Lake Rankings
Other Grade B Lakes in Kansas
Eutrophic Lakes in Kansas
Where this data comes from
7 measurements from 1 monitoring station, 2014–2018. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Kansas Department Of Health And Environment
21KAN001_WQX7 samples · 2014–2018
Analytical methods
- Depth, Secchi disk depth
- Phosphorus by Colorimetry
- 10200 H ~ Chlorophyll a-b-c Determination
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
Lake size & watershed from HydroLAKES (HydroSHEDS)