Rocky Lake
Washita County, Oklahoma347 acresView mapDirections
Oklahoma DEQ publishes the water-quality measurements for Rocky Lake. Here is what has been measured.
- Limited data
Rocky Lake in Washita County, Oklahoma has water-quality measurements published by Oklahoma DEQ, shown here as reported. Water clarity: 0.7 ft visibility. Surface area: 347 acres.
Rocky Lake is a 347-acre lake in Washita County, Oklahoma.
Source: EPA Water Quality Portal sampling records, ODEQ, last sampled 2017-09-12. Methodology: how these readings are compared.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Rocky 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 Rocky Lake
These are the measurements Oklahoma DEQ publishes for Rocky 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 0.7 ft of visibility. TSI 82.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 0.7ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | No reading The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. | |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 82 | Hypereutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Very high nutrients, dense algae, poor clarity
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Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
347 acres
No bathymetric survey has been published for Rocky Lake, so its depth is not documented here.
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Fishing Rocky Lake
Reservoir Info (USACE NID)
Rocky Lake is a man-made reservoir impounded by the Hobart (completed 1933), built primarily for water supply on the Little Elk Creek; earth-type dam, 35 ft tall and 1,950 ft long.
- Surface area
- 347 ac
- Normal storage
- 4,210 ac-ft
- Max storage
- 8,669 ac-ft
- Drainage area
- 58.4 sq mi
- Hazard class
- High
- Owner
- City of Hobart
Source: USACE National Inventory of Dams, NID ID OK10494 · Operator website
Nearby Lakes in Washita County
Frequently asked questions about Rocky Lake
Where is Rocky Lake?
- Rocky Lake is a lake in Washita County, Oklahoma. Its water-quality measurements are published by Oklahoma DEQ and shown on this page as reported.
What is the water quality of Rocky Lake?
- Rocky Lake in Washita County, Oklahoma has water-quality measurements published by Oklahoma DEQ, shown here as reported. Water clarity: 0.7 ft visibility. Surface area: 347 acres.
Is Rocky Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Explore Rocky Lake across LakeQuality
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Where this data comes from
9 measurements from 3 monitoring stations, 2017. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- OWRB Lakes Monitoring
OKWRB-LAKES_WQX9 samples · 2017
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.