Cottonwood Slough in Codington County, South Dakota, offers a unique paddling experience through wetland habitat in the northeastern part of the state. The slough is part of the Glacial Lakes and Prairies region, characterized by numerous pothole lakes and marshes formed by retreating glaciers approximately 10,000 years ago. The waterway features cattail sloughs, open water areas, and marsh environments that support diverse wildlife populations.

Paddlers can expect to encounter various waterfowl species including ducks, geese, and yellow-headed blackbirds. The area also provides habitat for herons, marsh wrens, and other wetland bird species. The slough is located within the prairie pothole region, one of North America's most productive waterfowl breeding areas.

Access to Cottonwood Slough is available through public lands, though specific launch points may vary depending on water levels and seasonal conditions. The area is designated as a "no boating zone" during portions of the waterfowl season (October 20 to December 31) to protect nesting and migrating birds, so paddlers should plan trips accordingly.

Water conditions in the slough can vary significantly based on precipitation and seasonal fluctuations. During wet years, the area offers more extensive paddling opportunities, while drier periods may limit navigation. The shallow, marsh-like environment creates an intimate paddling experience, though vegetation can be dense in certain sections.

The surrounding landscape consists of native grasslands and agricultural lands typical of the Glacial Lakes region. Wildlife viewing opportunities extend beyond birds to include deer, mink, and various small mammals along the shoreline. Paddlers should be prepared for variable water depths, aquatic vegetation, and changing weather conditions common to the northern Great Plains.

The slough provides a peaceful setting for those seeking to explore South Dakota's prairie wetland ecosystems and observe the region's abundant birdlife in their natural habitat.