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Frank G. Bonelli Regional Park

Frank G. Bonelli Regional Park surrounds Puddingstone Reservoir with picnic areas, open landscape and a substantial network of multiuse trails.

Frank G. Bonelli Regional Park

The lake and surrounding hills support a varied outdoor visit near San Dimas.

The photograph shows the actual reservoir at sunset. Check current county opening days and entry fees before travelling; the park currently closes on Mondays and Tuesdays. Swimming operates seasonally in designated areas, while boating requires inspection and permits. Camping, rentals and nearby concession attractions have separate arrangements. Use the current trail map, share routes with other permitted users and respect temporary closures and water-access restrictions.

Visitor details reviewed October 26, 2026. Check official visitor information for current access, admission, and operating arrangements. View on OpenStreetMap.

Image credit: Plane777 at English Wikipedia / Wikimedia Commons. Original source. Public domain. Resized and converted to WebP; may be cropped for display.