Our Story
Welcome to Willow Mill
More Than an RV Park. A Destination.
Welcome to Willow Mill Campsite, a family-oriented campsite in Rio, Wisconsin, serving campers since 1968. Located between Madison and Wisconsin Dells, our campground offers shaded lakefront sites, a welcoming community, and a relaxing atmosphere in the heart of Columbia County.
Whether you're visiting for a weekend or an extended stay, you'll enjoy convenient amenities including RV sites, a swimming pool, kayak rentals, a game room, pavilion, camp store, and laundry facilities. Nearby attractions include Madison, Wisconsin Dells, Devils Lake State Park, and the scenic Wisconsin River corridor, making Willow Mill the perfect base for work, recreation, and outdoor adventure.
Park Information: Office hours are Sunday–Tuesday: 8 AM–5 PM, Wednesday: 8 AM–7 PM, and Thursday–Saturday: 8 AM–9 PM.
4.4
Google Rating
211
Ways to Stay
ways to stay
Find Your Perfect Stay

Full Hookup RV Sites
Our RV sites offer plenty of large, shaded spots to choose from. Lakefront sites put you right at the water’s edge, and our oversized sites handle big rigs without a problem.

Long Term RV Sites
Willow Mill has been a seasonal home for families since 1968, and our long term sites reflect that. Claim your spot for the season and spend your summers on the water in Columbia County.
Ready to Experience Willow Mill?
Whether you are booking a weekend getaway or settling in for longer, we would love to have you.
