Rc Longmire Lake
Garvin County, Oklahoma745 acresView mapDirections
Oklahoma DEQ publishes the water-quality measurements for Rc Longmire Lake. Here is what has been measured.
- Impaired · Turbidity
- 36 ft max depth
- Limited data
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Answers come straight from the public measurements and survey records on this page.
Rc Longmire Lake in Garvin County, Oklahoma has water-quality measurements published by Oklahoma DEQ, shown here as reported. Water clarity: 1.8 ft visibility. Surface area: 745 acres.
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Rc Longmire Lake is a 745-acre lake in Garvin County, Oklahoma with an estimated average depth of about 36 feet. Overall water quality is improving over recent sampling years.
Source: EPA Water Quality Portal sampling records, ODEQ, last sampled 2019-08-06. Grade methodology: LakeQuality methodology.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Rc Longmire Lake is listed impaired under Clean Water Act §303(d) (IR 5) for turbidity. Check local advisories before you swim.
Whether Rc Longmire 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 Rc Longmire Lake
These are the measurements Oklahoma DEQ publishes for Rc Longmire 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 1.8 ft of visibility. TSI 69.
| Metric | Value | EPA condition class |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.8 ft | Measured, not scored |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 69 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~36 ft est. |
| Average Depth | ~34 ft est. |
| Surface Area | 745 acres |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Oklahoma has not published bathymetry for Rc Longmire 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 Rc Longmire Lake
Water Quality Trend: ↑ Improving
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +8.5 m/yr | 2 |
Reservoir Info (USACE NID)
Rc Longmire Lake is a man-made reservoir impounded by the SCS-Cherokee Sandy Site-17 (completed 1989), built primarily for flood risk reduction on the Cherokee Sandy Creek; earth-type dam, 54 ft tall and 5,400 ft long.
- Surface area
- 745 ac
- Normal storage
- 14,424 ac-ft
- Max storage
- 26,300 ac-ft
- Drainage area
- 28.52 sq mi
- Hazard class
- Significant
- Owner
- GARVIN CO CONS DIST
Source: USACE National Inventory of Dams, NID ID OK21703 · Operator website
EPA Impairment Status
Rc Longmire 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 OK310810010186_00 · Official waterbody report
Nearby Lakes in Garvin County
Frequently asked questions about Rc Longmire Lake
Where is Rc Longmire Lake?
- Rc Longmire Lake is a lake in Garvin County, Oklahoma. Its water-quality measurements are published by Oklahoma DEQ and shown on this page as reported.
What is the water quality of Rc Longmire Lake?
- Rc Longmire Lake in Garvin County, Oklahoma has water-quality measurements published by Oklahoma DEQ, shown here as reported. Water clarity: 1.8 ft visibility. Surface area: 745 acres.
Is Rc Longmire Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Rc Longmire Lake is listed impaired under Clean Water Act §303(d) (IR 5) for turbidity. Check local advisories before you swim.
How deep is Rc Longmire Lake?
- No published bathymetric survey covers Rc Longmire Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 36 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 745 acres.
Explore Rc Longmire Lake across LakeQuality
Planning a trip around Chickasaw?
Rc Longmire Lake is about 20 miles from Chickasaw National Recreation Area. Crowds there swing hard by season, so the month you pick changes both how busy the park is and what lodging costs.
Best time to visit Chickasaw →More lakes in Oklahoma
Other Lakes in Oklahoma
Eutrophic Lakes in Oklahoma
Where this data comes from
24 measurements from 3 monitoring stations, 2016–2019. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- OWRB Lakes Monitoring
OKWRB-LAKES_WQX24 samples · 2016–2019
Analytical methods
- OWRB Lakes Field Data Collection
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)