Recent rains have closed parks on the Mississippi River, just as Memorial Day weekend visitors are about to arrive. The state D-N-R says some of its parks and trails were shut down this week due to high water — and on Wednesday, the U-S Army Corps of Engineers closed Blackhawk Park at De Soto until conditions improve. The National Weather Service has flood warnings posted until Saturday on the Mississippi at Winona — Monday at La Crosse and Winona — next Wednesday near Nelson — and until further notice at Prairie du Chien and Guttenberg, Iowa. Minor flooding is forecast in all those places. The Wisconsin River at Portage and the Trempealeau River at Dodge are also above their flood stages. Washington County officials in Minnesota have declared a no wake zone for boats on the Saint Croix between Prescott and Saint Croix Falls.