McMillan is a boat-in only backcountry campsite on Ross Lake in North Cascades National Recreation Area, accessible exclusively by kayak or canoe—making it an ideal first-night stop for multi-day paddling trips.

The site features spacious tent pads (accommodating 6-8 people per site), new pit toilets, and a dock with evening sun exposure, though water views from campsites are limited due to forested terrain.

Reservations are required May 15–September 30 through the National Park Service, and campers must bring their own water and pack out all trash.