A spill at a sand mining facility in Wisconsin has dumped an unknown amount of sand and other sediment into the St. Croix River and wetlands near the Minnesota border.  Wisconsin DNR officials say it's too soon to know how much damage was done.
 
Conservation officials learned of the leak on April 22nd, when a hiker reported seeing cream-colored water in a creek flowing to the St. Croix River. DNR investigators traced the murky water back to a sand mining facility operated by Maple Grove-based Tiller Corporation, where they located a leak in a holding pond.