Overview

The Kinnickinnic River, commonly called the Kinni, is a roughly 22-mile (35 km) stream in northwestern Wisconsin in the United States. It flows generally south and west to join the St. Croix River, itself a major tributary of the Mississippi. The Kinni is well known locally for its clear, cold water and for flowing through the city of River Falls, where urban and rural landscapes meet along its banks.

Physical characteristics

The river’s upper reaches are characterized by a relatively steep gradient, gravel and cobble substrates, and frequent riffles and pools—conditions that favor cold-water species. Much of the channel is spring-influenced, which helps maintain low temperatures through the summer months. The corridor includes riparian woodlands, agricultural land, and patches of restored prairie; these land uses influence runoff, shading, and sediment inputs.

Ecology and fishery

The Kinni is classified as a cold water fishery and has earned official recognition for its trout populations. The stream supports notable wild Brook and Brown Trout, and state assessments report self-sustaining populations and naturally reproducing trout in suitable reaches. A healthy invertebrate community (mayflies, caddisflies, stoneflies) provides the food base for trout, while intact riparian vegetation stabilizes banks and contributes woody debris that forms fish habitat.

Recreation and public access

The river is a popular destination for anglers practicing fly-fishing and catch-and-release techniques, and it also attracts hikers, birdwatchers, and paddlers where channel width and flow allow. Public access points, municipal parks, and trail corridors provide places for the community to enjoy the river, and seasonal fishing regulations reflect the goal of protecting wild trout stocks.

Conservation, management, and threats

Because the Kinnickinnic supports wild trout and high-quality aquatic habitat, state and local agencies, together with community groups, work to monitor water quality and limit impacts from stormwater, bank erosion, nutrient runoff, and rising stream temperatures. Management measures commonly applied in the watershed include riparian buffer restoration, land conservation easements, stormwater retrofits in urban sections, and public education to reduce nonpoint pollution.

History and notable facts

The river’s name is related to the Algonquian term often rendered as "kinnikinnick," which referred to a traditional mixture of plant materials used by Indigenous peoples. As a tributary of the St. Croix, the Kinnickinnic contributes to a larger river system valued for its scenic, ecological, and recreational resources. Ongoing stewardship aims to keep the Kinni a demonstrably healthy Class I trout stream for future generations.

  • Official fishery designation and monitoring help guide management (trout classification).
  • Conservation actions include riparian planting, land protection, and stormwater control (habitat protection).
  • Community science and angler observations contribute to data on population trends and reproduction.