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/