Fee: No entrance fee. Fees apply for camping and shelter rental; reserve at reserveohio.com or (866) 644-6727.
About this park
Cowan Lake State Park offers a quiet escape with scenic inlets and a wooded shoreline in southwest Ohio. The 700-acre lake allows boats up to 10 horsepower, which suits both boaters and anglers, and bald eagles are often seen overhead. Visitors enjoy swimming, fishing, sailing, kayaking, archery, disc golf, hiking and picnicking at the park's shelters. Note that a dam rehabilitation project runs from 2026 to 2028, with water levels being lowered 13.5 feet beginning in November ahead of construction, so boat ramps will become inaccessible and the park advises checking conditions before visiting. Water levels are targeted to return by summer 2028.
Cowan Lake State Park FAQ
Where is Cowan Lake State Park located?
Cowan Lake State Park is in Wilmington, Ohio, at 1750 Osborn Road. GPS coordinates: 39.3862, -83.8989. Get directions.
Is there an entrance fee at Cowan Lake State Park?
No entrance fee. Fees apply for camping and shelter rental; reserve at reserveohio.com or (866) 644-6727. Fees can change by season, so confirm with the park before you go.
How do I contact Cowan Lake State Park?
You can call (937) 382-1096. The park office can confirm RV site availability, hookups, length limits and current conditions.
Are there RV campgrounds near Cowan Lake State Park?
Yes. The closest RV-friendly campgrounds listed on ParkedRV are:
- Oak Hill - Lake Vesuvius (86.2 mi, reservable)
- Iron Ridge - Lake Vesuvius (87.3 mi, reservable)
- Boat Gunnel Group Campground (91.5 mi, reservable)
How current is this information about Cowan Lake State Park?
This listing was last updated on October 6, 2026. If something is out of date, let us know and we'll fix it.