St. Croix Islands

St. Croix Islands State Recreation Area encompasses several islands within the St. Croix River in Washington County, on the Minnesota-Wisconsin border. This unique water-access-only recreation area protects islands in the lower St. Croix River, which is part of the St. Croix National Scenic Riverway, one of the original eight Wild and Scenic Rivers designated by Congress in 1968. The islands provide a paddling-focused outdoor experience, with primitive campsites accessible only by canoe, kayak, or motorboat. The recreation area offers a sense of river wilderness within easy reach of the Twin Cities metropolitan area, where the broad St. Croix River creates a scenic and ecologically rich corridor.

The St. Croix River islands and surrounding waters support a diverse aquatic and riparian wildlife community. The river is home to smallmouth bass, walleye, channel catfish, and sauger, making it one of the premier fishing rivers in the Twin Cities region. Bald eagles are abundant along the river corridor and frequently nest in tall trees on or near the islands. Great blue herons, belted kingfishers, and various duck species utilize the island habitats. River otters and beavers are active in the river channel. The islands' location in the river corridor makes them important stopover habitat for migrating songbirds. Turtles, including map turtles and softshell turtles, bask on the islands' sand bars and logs.

The river islands support floodplain forest communities of silver maple, cottonwood, river birch, and willows adapted to periodic flooding and shifting sand. Herbaceous vegetation on the islands includes river-bottom species like wild rye, sedges, and various wetland grasses. The islands' vegetation is dynamic, shaped by river flooding, ice scour, and sand deposition that constantly rearrange the island surfaces. Some larger, more stable islands support mature trees, while smaller islands may be little more than sandbars with pioneer vegetation. The river corridor's intact floodplain forest is increasingly rare in the Twin Cities region and provides an important ecological connection between upstream wild areas and the downstream Mississippi River.

The islands in the St. Croix River were formed by the river's depositional processes, with sand, silt, and gravel accumulating in the channel to create emergent landforms. The lower St. Croix River valley was carved by the glacial River St. Croix, a meltwater channel that carried enormous volumes of water from retreating glaciers approximately 10,000-12,000 years ago. The river valley is wide relative to the current stream, reflecting its origin as a glacial spillway. The islands shift and change over time in response to floods, ice movement, and natural river channel dynamics. The underlying bedrock of the valley includes St. Peter Sandstone and Prairie du Chien dolostone, Paleozoic formations that the river has exposed along valley walls.

The St. Croix Islands experience a humid continental climate similar to the Twin Cities metropolitan area, with warm summers and cold winters. Summer highs average about 82°F with moderate humidity, while winter lows average around 4°F with annual snowfall of approximately 50 inches. The river valley can channel winds and create its own microclimate, with fog common during transitional seasons. The island campsites are exposed to river breezes that provide natural cooling in summer but can make conditions feel colder in spring and fall. The river typically freezes from December through March, making island access impractical during winter months. Summer thunderstorms can produce rapidly rising water that may temporarily flood low-lying island areas.

The St. Croix River has been a vital transportation corridor for thousands of years, with Dakota and Ojibwe peoples traveling the river by canoe for trade, fishing, and seasonal movement. French fur traders established posts along the river in the 17th and 18th centuries, and the St. Croix became a major logging river in the mid-1800s, with log rafts and steamboats passing the islands regularly. The town of Stillwater, downstream from the recreation area, was one of Minnesota's first communities, founded on the lumber trade. The river's designation as one of the nation's first Wild and Scenic Rivers in 1968 recognized its exceptional scenic, recreational, and ecological values and provided lasting protection from development.

St. Croix Islands State Recreation Area was established to provide managed camping access to the river islands while protecting their natural character. The recreation area operates under the broader protection framework of the St. Croix National Scenic Riverway, managed cooperatively by the National Park Service and state agencies in both Minnesota and Wisconsin. The primitive camping sites on the islands were established to provide a structured alternative to unmanaged island camping that was causing environmental damage. The recreation area represents a model for managing recreational use of river islands that balances public access with resource protection in a nationally significant river corridor.

The recreation area's primary attraction is the experience of paddling to and camping on islands in the scenic St. Croix River. Primitive campsites on several islands offer a genuine island camping experience with the sound of flowing water and views of the forested river corridor. Canoeing and kayaking are the primary activities, with the lower St. Croix providing gentle current suitable for paddlers of all skill levels. Fishing for smallmouth bass and walleye is excellent in the river channel around the islands. The river corridor is outstanding for wildlife observation, particularly bald eagles and other raptors. No trails exist on the small islands, but the natural exploration of island habitats — sand bars, driftwood accumulations, and riverside forest — provides discovery opportunities.

St. Croix Islands State Recreation Area is accessible only by water, with boat launches available at several locations along the lower St. Croix River in Washington County. The recreation area is approximately 30 miles northeast of St. Paul. The islands offer primitive camping only — no drinking water, electricity, or toilet facilities are available on the islands. Campers must carry in all supplies and carry out all waste. A Minnesota state park vehicle permit is required at the launch sites, and camping reservations may be required during peak season. The river is navigable by canoe, kayak, or motorboat. The town of Stillwater and other St. Croix Valley communities provide all services including outfitters, restaurants, and lodging.

Protecting the natural character of the river islands while accommodating recreational use is the recreation area's central management challenge. Leave-no-trace camping practices are essential on the islands, where fragile soils and vegetation can be quickly damaged by concentrated use. The islands' floodplain ecosystems are naturally dynamic, and management respects the river's role in shaping and reshaping the island landscape through flooding, erosion, and deposition. Invasive species, particularly reed canary grass and purple loosestrife, threaten native riparian vegetation and require ongoing control. The recreation area operates within the National Scenic Riverway framework, which coordinates management across state and federal agencies to protect water quality, scenic values, and ecological integrity throughout the St. Croix River corridor.