United States, Minnesota, Itasca, NE1/4 SE1/4 Sec21, T55N, R25W; Grand Rapids. Directly under the bridge where Hwy 169 crosses the Mississippi River in Gr NE1/4 SE1/4 Sec21, T55N, R25W; Grand Rapids. Directly under the bridge where Hwy 169 crosses the Mississippi River in Grand Rapids. Coll. site no 67.. 055N 25W 21