The last natural and wild stretch of the 2,300-mile Missouri River is a 75-mile corridor from Yankton to Sioux City but eagles and herons usually outnumber people along the river. That changes on a Saturday every May with the South Dakota Kayak Challenge. Started four years ago, the kayak (and canoe) race attracts more than a hundred adventurers to the scenic waterway. The challenge was held Saturday (May 25) despite overcast skies and a strong east wind. Photos by Bernie Hunhoff.