Detour around Whitewater State Park begins Monday Minnesota Highway 74 will be closed for bridge construction at the south end of the park through October. 7:39 pm, Jan. 27, 2021 × WHITEWATER STATE PARK — That quick getaway to one of Southeast Minnesota’s favorite nature spots will take a little extra planning for 2021. Starting Monday and going through October, Minnesota Highway 74 will be a construction zone at the south end of the park while Minnesota Department of Transportation crews reconstruct four historic bridges in a $4.6 million project. “These (bridges) were started in 1935 or ’36, in that range, over the winter,” said Jeremy Darst, a naturalist and historian for the park.