Geary Co State Fishing Lake
Geary County, Kansas96 acresView mapDirections
Clarity, phosphorus, and algae sit in the clean band for this region.
- Eutrophic
- Impaired · Nutrients (phosphorus, nitrogen)
- #1 of 1 in the county
- 67 ft max depth
- Public access
- Limited data
Geary Co State Fishing Lake in Geary County, Kansas has a water quality grade of B (Good). Water clarity: 4.3 ft visibility. Phosphorus: 31.5 µg/L. Chlorophyll-a (algae): 12.8 µg/L. Surface area: 96 acres.
- Clarity
- 4.3 ft
- Max depth
- ~67 ft est.
- Area
- 96 acres
- Type
- Eutrophic
- Phosphorus
- 31.5 µg/L
- Chlorophyll-a
- 12.8 µg/L
- Trend
- ↑ Improving
- Public access
- Yes
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Watch Geary Co State Fishing Lake’s letter
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Geary Co State Fishing Lake is a 96-acre productive, nutrient-rich eutrophic lake in Geary County, Kansas with an estimated average depth of about 67 feet. Water quality is graded B based on 1 sampling years through 2018. Overall water quality is improving over recent sampling years. Limited fish-species data available. Public access is available.
Source: EPA Water Quality Portal sampling records, KDHE, last sampled 2018-06-12. 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. Geary Co State Fishing 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: B (Good)
Murky, only visible to about 4.3 ft. Phosphorus 31.5 µg/L. Chlorophyll-a 12.8 µg/L. TSI 55. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4.3 ft | Not graded |
| Phosphorus | 31.5 µg/L | Not graded |
| Chlorophyll-a (Algae) | 12.8 µg/L | Good |
| Trophic State Index (TSI) | 55 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~67 ft est. |
| Average Depth | ~13 ft est. |
| Surface Area | 96 acres |
| Public Access | Yes |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Kansas has not published bathymetry for Geary Co State Fishing 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 Geary Co State Fishing Lake
Water Quality Trend: ↑ Improving
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | +0.007 m/yr | 2 |
| Phosphorus | ↑ Improving | -1.42 µg/L/yr | 2 |
| Chlorophyll-a | ↑ Improving | -2.18 µg/L/yr | 2 |
Reservoir Info (USACE NID)
Geary Co State Fishing Lake is a man-made reservoir impounded by the Geary County State Fishing Lake (completed 1960) on the Lyon Creek-Tr; other-type dam, 60 ft tall and 1,045 ft long.
- Surface area
- 96 ac
- Normal storage
- 1,635 ac-ft
- Max storage
- 2,765 ac-ft
- Hazard class
- Low
- Owner
- KANSAS DEPT OF WILDLIFE PARKS & TOURISM
Source: USACE National Inventory of Dams, NID ID KS00872 · Operator website · Matched by proximity (0.23 km)
EPA Impairment Status
Geary Co State Fishing 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-LM043201 · Official waterbody report · Matched by proximity (0.57 km)
County Ranking
Ranked #1 of 1 lakes in Geary County
Nearby Lakes in Geary County
Frequently asked questions about Geary Co State Fishing Lake
Where is Geary Co State Fishing Lake?
- Geary Co State Fishing Lake is a lake in Geary County, Kansas. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Geary Co State Fishing Lake?
- Geary Co State Fishing Lake in Geary County, Kansas has a water quality grade of B (Good). Water clarity: 4.3 ft visibility. Phosphorus: 31.5 µg/L. Chlorophyll-a (algae): 12.8 µg/L. Surface area: 96 acres.
Is Geary Co State Fishing Lake safe to swim in?
- The B is nutrients and algae, not a swimming clearance. Geary Co State Fishing Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
How deep is Geary Co State Fishing Lake?
- No published bathymetric survey covers Geary Co State Fishing Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 67 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 96 acres.
Explore Geary Co State Fishing Lake across LakeQuality
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Where this data comes from
8 measurements from 1 monitoring station, 2012–2018. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Kansas Department Of Health And Environment
21KAN001_WQX8 samples · 2012–2018
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
Impairment status from EPA ATTAINS 303(d) database
Lake size & watershed from HydroLAKES (HydroSHEDS)