Keystone Lake
Pawnee County, OklahomaView mapDirections
Oklahoma DEQ publishes the water-quality measurements for Keystone Lake. Here is what has been measured.
- Impaired · Turbidity
- Public access
- Limited data
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Answers come straight from the public measurements and survey records on this page.
Keystone Lake in Pawnee County, Oklahoma has water-quality measurements published by Oklahoma DEQ, shown here as reported. Water clarity: 1.9 ft visibility.
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Keystone Lake is a lake in Pawnee County, Oklahoma. Overall water quality is improving over recent sampling years. Limited fish-species data available. Public access is available with 4 public boat landings.
Source: EPA Water Quality Portal sampling records, ODEQ, last sampled 2024-10-21. Grade methodology: LakeQuality methodology.
What Keystone Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch4 documented ramps
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Keystone Lake is listed impaired under Clean Water Act §303(d) (IR 5) for turbidity. Check local advisories before you swim.
Whether Keystone Lake is safe to swim in today is a call for the Oklahoma Department of Environmental Quality and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Keystone Lake
These are the measurements Oklahoma DEQ publishes for Keystone Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Very murky, less than 1.9 ft of visibility. TSI 68.
| Metric | Value | EPA condition class |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.9 ft | Measured, not scored |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 68 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Recreation & Access
- Walnut Creek ParkPublic
- Akdar ShrinePublic
- Osage Point ParkPublic
- Cimarron RiverPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Keystone Lake
Water Quality Trend: ↑ Improving
Based on 4 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +1.233 m/yr | 4 |
EPA Impairment Status
Keystone Lake is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit OK621200010020_00 · Official waterbody report
Nearby Lakes in Pawnee County
Frequently asked questions about Keystone Lake
Where is Keystone Lake?
- Keystone Lake is a lake in Pawnee County, Oklahoma. Its water-quality measurements are published by Oklahoma DEQ and shown on this page as reported.
What is the water quality of Keystone Lake?
- Keystone Lake in Pawnee County, Oklahoma has water-quality measurements published by Oklahoma DEQ, shown here as reported. Water clarity: 1.9 ft visibility.
Is Keystone Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Keystone Lake is listed impaired under Clean Water Act §303(d) (IR 5) for turbidity. Check local advisories before you swim.
Are there boat ramps on Keystone Lake?
- Keystone Lake has 4 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Walnut Creek Park, Akdar Shrine, Osage Point Park, Cimarron River. Public access is listed as yes.
Explore Keystone Lake across LakeQuality
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Where this data comes from
175 measurements from 12 monitoring stations, 2016–2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- OWRB Lakes Monitoring
OKWRB-LAKES_WQX175 samples · 2016–2024
Analytical methods
- OWRB Lakes Field Data Collection
- Phosphorus by Two Reagent Colorimetry
- 10200 H ~ Chlorophyll a-b-c Determination
- Determination of Turbidity
Monitoring station identifiers (12)
- OKWRB-LAKES_WQX-621200010050-03
- OKWRB-LAKES_WQX-621200010020-02
- OKWRB-LAKES_WQX-620900010090-10
- OKWRB-LAKES_WQX-620900010020-09
- OKWRB-LAKES_WQX-620900010090-11
- OKWRB-LAKES_WQX-620900010020-06
- OKWRB-LAKES_WQX-620900010020-08
- OKWRB-LAKES_WQX-620900010020-07
- OKWRB-LAKES_WQX-621200010050-04
- OKWRB-LAKES_WQX-620900010090-12
- OKWRB-LAKES_WQX-621200010020-01
- OKWRB-LAKES_WQX-621200010050-05
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
Named boat-access points from the USGS National Boat Ramps inventory