Beach days on the St. Croix

The St. Croix is a sandbar river, which means its beaches come and go with the water level, and that is half the fun. The sandy spots below are the classics, the ones locals check first every summer. One honest note before the list: sandbars pop up and shift with the water level, so part of the fun is finding the beach that appears this week. Treat every sandbar day as an adventure, not a reservation.

Beer Can Island, the little island near Hudson with the most honest name on the river, is the sandbar beach that tells you right away this river is a playground. Boats pull up on its shores all summer, the shallow water is perfect for wading, and the party energy matches the name. It also made river history in 2025 when the abandoned 54-foot Sweet Destiny was finally towed off the island, and that saga is now part of the island's legend.

South of the railroad swing bridge in Hudson, the channel splits around a handful of sandy islands, and on summer weekends the boats pull up and claim their spots. It is classic sandbar country: shallow water, sand underfoot, and boats rafted together in the sun. The islands sit close enough to town that they make an easy afternoon from the Hudson launches.

Where the Kinnickinnic River, the Kinni, meets the St. Croix at Kinnickinnic State Park, one of the river's classic sandbar beaches spreads out at the mouth. It is a natural gathering spot, with boaters on the river side and the Kinni's cold water tumbling in just behind. The Kinni itself is a fragile, cold-water trout stream and deserves a gentle touch, but the sandbar where it meets the big river is one of the best beach days on the lower St. Croix.

If you would rather walk in than boat in, Kinnickinnic State Park keeps a sandy swimming beach right on the St. Croix. The swim area is marked by buoys, and there is no lifeguard, so the water is on you and your crew. It is the quiet, family-friendly version of a river beach day, and the park setting makes it feel a world away from the channel traffic.

Here is the honest system I use with my own kids: check the water level before you head out, because the island that had a beach in June can be under water in July and wide open again by August. Watch where sandbars appear after the river drops, and where the boats cluster on a Saturday, because the sandbar crowd is the best channel marker there is. The beaches never stay the same, which is exactly why two beach days on the St. Croix are never the same day twice.