William O'Brien State Park

William O'Brien State Park offers a wonderful escape into Minnesota's natural beauty along the scenic St. Croix River valley. Located in the charming community of Marine on St. Croix, this seasonal state park provides the perfect base for exploring one of the Midwest's most picturesque waterways and the surrounding landscape that has captivated visitors for generations.

The park's 62 campsites are thoughtfully situated to give you that genuine outdoor experience while providing the comfort you need after a day of adventure. With full hookups available, you can settle in and relax knowing you have all the conveniences of home. The facilities are well-maintained, featuring clean restrooms and hot showers so you can refresh after hiking, fishing, or exploring the area. Convenient dump stations make it easy to manage your RV's systems.

What makes William O'Brien special is its direct connection to outdoor recreation. The park features a boat ramp, making it an ideal spot for fishing enthusiasts who want to try their luck on the St. Croix River, known for its walleye, northern pike, and smallmouth bass. Whether you're an experienced angler or just looking to cast a line and enjoy the tranquility of the water, you'll find plenty of opportunities here. Even if fishing isn't your main interest, the river itself is a joy to experience, offering scenic beauty and peaceful moments.

The campground's picnic tables and fire rings create perfect gathering spaces for families and groups. Roasting marshmallows by the fire while surrounded by Minnesota's natural landscape becomes a cherished memory for many visitors. The area surrounding Marine on St. Croix is known for its charming small-town character, local history, and access to beautiful river bluffs and wooded trails.

This park is ideal for anyone seeking a relaxing getaway with a focus on water-based recreation, fishing, and nature appreciation. It's perfect for families, couples, and solo travelers who want to unplug while still enjoying modern RV amenities. The seasonal operation from May through October means you'll experience pleasant weather and vibrant natural surroundings throughout your stay.