Marion Reservoir
Swimming hole in Marion, Kansas · Lake
Marion Reservoir is a US Army Corps of Engineers lake about 60 minutes north of Wichita. The designated swim beach is at Hillsboro Cove Campground, which has a life-jacket loaner board. This is not Marion County Lake, which had a KDHE Watch advisory in September 2026. Confirm Corps day-use or camping fees at the gate.
Typical season: June through early August
About Marion Reservoir
Marion Reservoir is a lake swimming beach about 60 minutes north of Wichita. The designated swim is at Hillsboro Cove, a US Army Corps of Engineers campground beach with a life-jacket loaner board. It is a quieter full-lake day than Cheney, with Flint Hills sky and fewer Wichita weekend crowds. Do not confuse it with Marion County Lake, a separate smaller lake that appeared on KDHE’s Watch list in September 2026. Fees depend on whether you enter a developed Corps park as a day user or camper. pay at the gatehouse.
Key facts
Structured details for trip planning — verify access and fees with the land manager before you visit.
- Water type
- Lake
- Water body
- Marion Reservoir
- Fee
- USACE camping/day-use fees at developed parks; Hillsboro Cove beach
- Nearest town
- Marion
- State
- Kansas
- Coordinates
- 38.34440, -97.18330
- Best season
- June through early August; confirm Corps beach status and KDHE.
- Access difficulty
- Easy beach inside Hillsboro Cove.
- Lifeguard
- None — assume unguarded
- Camping
- Cottonwood Point and Hillsboro Cove (Recreation.gov).
- Land manager
- U.S. Army Corps of Engineers
- Activities
- Swimming, camping, fishing, boating
- Facilities
- Hillsboro Cove and Cottonwood Point parks: showers, boat ramps, playgrounds, swim beach, life-jacket loaner board.
- Listing last updated
- September 6, 2026
The experience
- Best time to visitJune through early August; confirm Corps beach status and KDHE.
- AccessEasy beach inside Hillsboro Cove.
- FacilitiesHillsboro Cove and Cottonwood Point parks: showers, boat ramps, playgrounds, swim beach, life-jacket loaner board.
- Camping nearbyCottonwood Point and Hillsboro Cove (Recreation.gov).
Highlights & features
- Less crowded than Cheney or Afton
- Hillsboro Cove designated beach with PFD loaner board
- Solid backup when closer lakes post HAB warnings
- USACE Cottonwood Point and Hillsboro Cove class-A parks
How to get there
From Wichita, take I-135 north, then follow US-56 / county roads toward Hillsboro and Marion Reservoir. Target Hillsboro Cove for the swim beach. Project office phone (620) 382-2101. Allow about an hour.
Plan your visit
Use Marion when Lake Afton is under a HAB Warning and you want more space than Cheney. For a longer Flint Hills beach, Council Grove Lake is the next hop east.
Access & fees
USACE developed parks may charge camping or day-use fees. The swim beach is inside Hillsboro Cove. Confirm current gate fees on arrival or Recreation.gov.
Frequently asked questions
Can you swim at Marion Reservoir?
Yes. The designated Corps beach is at Hillsboro Cove Campground and includes a life-jacket loaner board. Swim when conditions allow — there is no lifeguard.
Is Marion Reservoir the same as Marion County Lake?
No. Marion Reservoir is the large USACE lake. Marion County Lake is a smaller county lake that had a KDHE Watch advisory in September 2026. Do not mix up the two when you check algae lists.
How do you get to Marion Reservoir from Wichita?
About 60 minutes north via I-135 and US-56 / local lake roads toward Hillsboro and Marion. Hillsboro Cove holds the swim beach.
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Map & location
Conservation
Pack out trash; keep boats outside the swim area; report blooms to KDHE.
Sources & updates
Official land managers cited on this page
Always confirm current rules, closures, and fees on the agency site before visiting.
Reference sources
Spotted outdated access, fees, or safety info? Send a correction with the page URL — we review every submission.