Pratt County Lake
Pratt County, Kansas51 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)
- Limited data
Pratt County Lake in Pratt County, Kansas is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 1.2 ft visibility. Phosphorus: 325 µg/L. Chlorophyll-a (algae): 110 µg/L. Surface area: 51.1 acres.
- Clarity
- 1.2 ft
- Area
- 51 acres
- Phosphorus
- 325 µg/L
- Chlorophyll-a
- 110 µg/L
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Watch Pratt County Lake’s letter
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Why Pratt County 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 Pratt County Lake, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded water clarity, phosphorus and algae (chlorophyll-a).
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.
Pratt County Lake is a 51-acre lake in Pratt County, Kansas.
Source: EPA Water Quality Portal sampling records, KDHE, last sampled 2014-06-18. Grade methodology: LakeQuality methodology.
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Pratt County Lake is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen), pH / acidity. Check local advisories before you swim.
Water quality measurements for Pratt County Lake
These readings exist but are not enough for an A–F grade — see why.
Very murky, less than 1.2 ft of visibility. Phosphorus 325 µg/L. Chlorophyll-a 110 µg/L. TSI 80.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.2 ft | Not graded |
| Phosphorus | 325 µg/L | Not graded |
| Chlorophyll-a (Algae) | 110 µg/L | Not graded |
| Trophic State Index (TSI) | 80 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 51 acres |
No bathymetric survey has been published for Pratt County Lake, so its depth is not documented here.
Fishing Pratt County Lake
Reservoir Info (USACE NID)
Pratt County Lake is a man-made reservoir impounded by the Pratt County Lake (completed 1938), built primarily for recreation on the South Fork Ninnescah River; earth-type dam, 19 ft tall.
- Surface area
- 51.1 ac
- Normal storage
- 484 ac-ft
- Max storage
- 740 ac-ft
- Hazard class
- Low
- Owner
- PRATT COUNTY
Source: USACE National Inventory of Dams, NID ID KS07714 · Operator website
EPA Impairment Status
Pratt County 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-LM064001 · Official waterbody report · Matched by proximity (0.09 km)
Graded lakes near Pratt County Lake
Pratt County Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Pratt County
Frequently asked questions about Pratt County Lake
Where is Pratt County Lake?
- Pratt County Lake is a lake in Pratt 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 Pratt County Lake?
- Pratt County Lake in Pratt County, Kansas is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 1.2 ft visibility. Phosphorus: 325 µg/L. Chlorophyll-a (algae): 110 µg/L. Surface area: 51.1 acres.
Is Pratt County Lake safe to swim in?
- The letter is not a swimming clearance. Pratt County Lake is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen), pH / acidity. Check local advisories before you swim.
Explore Pratt County Lake across LakeQuality
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Where this data comes from
5 measurements from 1 monitoring station, 2014. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Kansas Department Of Health And Environment
21KAN001_WQX5 samples · 2014
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