Concannon State Fishing Lake
Finney County, Kansas15 acresView mapDirections
Not enough samples to grade — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). No letter yet. Here is what we do have.
- Impaired · Nutrients (phosphorus, nitrogen)
- 11 ft max depth
- Public access
- Limited data
Concannon State Fishing Lake in Finney County, Kansas is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 220 µg/L. Chlorophyll-a (algae): 1.2 µg/L. Surface area: 15.21 acres.
- Max depth
- ~11 ft est.
- Area
- 15 acres
- Phosphorus
- 220 µg/L
- Chlorophyll-a
- 1.2 µg/L
- Public access
- Yes
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Watch Concannon State Fishing Lake’s letter
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Why Concannon State Fishing Lake has no grade
We grade a lake only when the monitoring record supports a letter: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Concannon State Fishing Lake, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded phosphorus and algae (chlorophyll-a), but not water clarity.
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by KDHE and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Concannon State Fishing Lake is a 15-acre lake in Finney County, Kansas with an estimated average depth of about 11 feet. Limited fish-species data available. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, KDHE, last sampled 2016-06-14. Grade methodology: LakeQuality methodology.
What Concannon State Fishing Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Concannon State Fishing Lake is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen), salinity / chlorides, toxic inorganics. Check local advisories before you swim.
Water quality measurements for Concannon State Fishing Lake
These readings exist but are not enough for an A–F grade — see why.
No clarity data. Phosphorus 220 µg/L. Chlorophyll-a 1.2 µg/L. TSI 57.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 220 µg/L | Not graded |
| Chlorophyll-a (Algae) | 1.2 µg/L | Not graded |
| Trophic State Index (TSI) | 57 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~11 ft est. |
| Average Depth | ~8 ft est. |
| Surface Area | 15 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 Concannon 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.
Recreation & Access
- Concannon Wildlife AreaPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Concannon State Fishing Lake
Reservoir Info (USACE NID)
Concannon State Fishing Lake is a man-made reservoir impounded by the Concannon Marsh Dam (completed 1952), built primarily for fire protection, stock, or small fish pond on the Pawnee River-Tr; earth-type dam, 19 ft tall and 975 ft long.
- Surface area
- 15.21 ac
- Normal storage
- 45 ac-ft
- Max storage
- 150 ac-ft
- Drainage area
- 19.4 sq mi
- Hazard class
- Low
- Owner
- KANSAS DEPT OF WILDLIFE PARKS & TOURISM
Source: USACE National Inventory of Dams, NID ID KS00712 · Operator website · Matched by proximity (0.22 km)
EPA Impairment Status
Concannon State Fishing Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit KS-LM053601 · Official waterbody report · Matched by proximity (0.47 km)
Graded lakes near Concannon State Fishing Lake
Concannon State Fishing Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Finney County
Frequently asked questions about Concannon State Fishing Lake
Where is Concannon State Fishing Lake?
- Concannon State Fishing Lake is a lake in Finney County, Kansas. LakeQuality has not rated this lake (UNRATED) — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years).
What is the water quality grade for Concannon State Fishing Lake?
- Concannon State Fishing Lake in Finney County, Kansas is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 220 µg/L. Chlorophyll-a (algae): 1.2 µg/L. Surface area: 15.21 acres.
Is Concannon State Fishing Lake safe to swim in?
- The letter is not a swimming clearance. Concannon State Fishing Lake is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen), salinity / chlorides, toxic inorganics. Check local advisories before you swim.
How deep is Concannon State Fishing Lake?
- No published bathymetric survey covers Concannon State Fishing Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 11 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 15.21 acres.
Are there boat ramps on Concannon State Fishing Lake?
- Concannon State Fishing Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Concannon Wildlife Area. Public access is listed as yes.
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Where this data comes from
4 measurements from 1 monitoring station, 2016. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Kansas Department Of Health And Environment
21KAN001_WQX4 samples · 2016
Analytical methods
- 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)
Named boat-access points from the USGS National Boat Ramps inventory