Rocky Gorge Reservoir
Howard County, Maryland655 acresView mapDirections
No nutrient or algae sampling on record from MDE for this lake.
- Impaired · Nutrients (phosphorus, nitrogen)
- 76 ft max depth
Rocky Gorge Reservoir in Howard County, Maryland has water-quality measurements published by MDE, shown here as reported. Maximum depth: 75.5 ft. Surface area: 655 acres.
Rocky Gorge Reservoir is a 655-acre lake in Howard County, Maryland with a maximum depth of 76 feet.
Source: EPA Water Quality Portal sampling records, your state environmental agency. Methodology: how these readings are compared.
What Rocky Gorge Reservoir is good for
From access and monitoring records, not editorial picks.
- Deep water75.5 ft surveyed max depth
Swimming conditions
No readingNot rated
Nutrient and algae readings are not a swimming clearance. Rocky Gorge Reservoir is listed impaired under Clean Water Act §303(d) (IR 4A) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
Whether Rocky Gorge Reservoir is safe to swim in today is a call for the Maryland Department of the Environment and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Rocky Gorge Reservoir
These are the measurements MDE publishes for Rocky Gorge Reservoir, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data. TSI undefined.
Ask about Rocky Gorge Reservoir
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
75.5 ft
Surface area
655 acres
Shoreline
31.4 mi
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Fishing Rocky Gorge Reservoir
EPA Impairment Status
Rocky Gorge Reservoir is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).
Causes of impairment
Designated uses not supporting: Aquatic life.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit MD-021311070941-Rocky_Gorge_Reservoir · Official waterbody report
Nearby Lakes in Howard County
Frequently asked questions about Rocky Gorge Reservoir
Where is Rocky Gorge Reservoir?
- Rocky Gorge Reservoir is a lake in Howard County, Maryland. Its water-quality measurements are published by MDE and shown on this page as reported.
What is the water quality of Rocky Gorge Reservoir?
- Rocky Gorge Reservoir in Howard County, Maryland has water-quality measurements published by MDE, shown here as reported. Maximum depth: 75.5 ft. Surface area: 655 acres.
Is Rocky Gorge Reservoir safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Rocky Gorge Reservoir is listed impaired under Clean Water Act §303(d) (IR 4A) for nutrients (phosphorus, nitrogen). Check local advisories before you swim.
How deep is Rocky Gorge Reservoir?
- Rocky Gorge Reservoir has a maximum depth of 75.5 feet. The lake covers 655 acres.
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Where this data comes from
Measurements for Rocky Gorge Reservoir come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database