Winnebago Flats is a boat-in campground on Ross Lake featuring a dock and launch facility (usable when lake elevation is at 1,594 feet or higher, typically July-September).

The site offers fire rings, picnic tables, vault toilets, and bear-resistant food storage boxes, making it a well-equipped base for paddlers and boaters exploring the North Cascades backcountry. A backcountry permit is required for overnight stays.