Garvin County, Oklahoma · Water Quality Report Card
Rc Longmire Lake
Rc Longmire Lake in Garvin County, Oklahoma is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 1.8 ft visibility.
- Clarity
- 1.8 ft
- Mean depth
- ~34 ft est.
- Type
- Eutrophic
- Trend
- ↑ Improving
Rc Longmire Lake is a productive, nutrient-rich eutrophic lake in Garvin County, Oklahoma with an estimated average depth of about 34 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: LakeGrade methodology.
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Swimming Safety
Not rated for swimming — there is not enough monitoring data to judge this lake
Water Quality Grade: Not rated
Very murky, less than 1.8 ft of visibility. Trophic State Index: 69.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.8 ft | |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 69 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Average Depth | ~34 ft est. |
Depth marked “est.” is a modeled estimate from HydroLAKES, not a measured survey. Oklahoma has not published bathymetry for Rc Longmire Lake.
Where to stay near Rc Longmire Lake
Compare lakeside cabins, hotels, and vacation rentals near Rc Longmire Lake in Garvin County, Oklahoma — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
Top-rated places to stay near Rc Longmire Lake
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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 |
Location
Nearby Lakes in Garvin County
Explore Rc Longmire Lake across LakeGrade
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 Oklahoma Lake Rankings
Other Lakes in Oklahoma
Eutrophic Lakes in Oklahoma
More records, surveys & data sources
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.
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)
Grade thresholds come from the U.S. EPA National Lakes Assessment 2022 Technical Support Document (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated.
Data Sources
Water quality data from the EPA Water Quality Portal
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion
Most recent sample: 2019-08-06
Monitoring stations: 3