Mongold Day Use area is 1.5 miles west of Detroit Lake State Park. It's the only public boat launch facility on the lake, and features a swimming area, grass beach, picnic facilities and restrooms.
Mongold has 58 single car parking spaces and three fully-accessible parking spaces near the swimming area, and another 25 single car parking spaces at the top of the parking lot. There are 120 vehicle/trailer parking spaces, and three that are accessible to people with disabilities.
Overnight parking at Mongold is permitted only when the visitor is camping on Piety Island.
To check water levels, visit https://www.nwd-wc.usace.army.mil/nwp/teacup/willamette/
The lakes and rivers found within Oregon State Parks are open to unsupervised swimming. You are responsible for your own safety. Before you enter the water, you should judge your swimming skills against possible strong currents, cold water, underwater objects and steep drop-offs. Remember, that many of our natural bodies of water and man-made reservoirs are filled by snow runoff and remain cold year round. Please bring and wear a personal flotation device and swim with a buddy.
OPRD manages the day-use area under a lease agreement with the U.S. Department of Agriculture, Forest Service.