Lake Frederick
Tillman County, OklahomaView mapDirections
Oklahoma DEQ publishes the water-quality measurements for Lake Frederick. Here is what has been measured.
- Impaired · Mercury
- 54 ft max depth
- Public access
- Limited data
Ask about Lake Frederick
Answers come straight from the public measurements and survey records on this page.
Lake Frederick in Tillman County, Oklahoma has water-quality measurements published by Oklahoma DEQ, shown here as reported. Water clarity: 1.3 ft visibility.
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Lake Frederick is a lake in Tillman County, Oklahoma with an estimated average depth of about 54 feet. Overall water quality is declining over recent sampling years. Limited fish-species data available. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, ODEQ, last sampled 2023-10-16. Grade methodology: LakeQuality methodology.
What Lake Frederick is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Lake Frederick is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, turbidity. Check local advisories before you swim.
Whether Lake Frederick 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 Lake Frederick
These are the measurements Oklahoma DEQ publishes for Lake Frederick, 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 1.3 ft of visibility. TSI 74.
| Metric | Value | EPA condition class |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.3 ft | Measured, not scored |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 74 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~54 ft est. |
| Average Depth | ~18 ft est. |
| Public Access | Yes |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Oklahoma has not published bathymetry for Lake Frederick.
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
- Lake FrederickPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Lake Frederick
Water Quality Trend: ↓ Declining
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -4.4 m/yr | 2 |
EPA Impairment Status
Lake Frederick 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 OK311310030120_00 · Official waterbody report
Nearby Lakes in Tillman County
Frequently asked questions about Lake Frederick
Where is Lake Frederick?
- Lake Frederick is a lake in Tillman County, Oklahoma. Its water-quality measurements are published by Oklahoma DEQ and shown on this page as reported.
What is the water quality of Lake Frederick?
- Lake Frederick in Tillman County, Oklahoma has water-quality measurements published by Oklahoma DEQ, shown here as reported. Water clarity: 1.3 ft visibility.
Is Lake Frederick safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Lake Frederick is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, turbidity. Check local advisories before you swim.
How deep is Lake Frederick?
- No published bathymetric survey covers Lake Frederick, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 54 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
Are there boat ramps on Lake Frederick?
- Lake Frederick has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Lake Frederick. Public access is listed as yes.
Explore Lake Frederick across LakeQuality
2 documented falls within 16.8 mi, nearest Post Oak Falls
Species activity outlook by water temperature and season
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Where this data comes from
34 measurements from 3 monitoring stations, 2017–2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- OWRB Lakes Monitoring
OKWRB-LAKES_WQX34 samples · 2017–2023
Analytical methods
- OWRB Lakes Field Data Collection
- Determination of Turbidity
Monitoring station identifiers (3)
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
Lake size & watershed from HydroLAKES (HydroSHEDS)
Named boat-access points from the USGS National Boat Ramps inventory