Oahe Dam dam upstream is Garrison Dam, near Riverdale, North Dakota, and the next dam downstream is Big Bend Dam, near Fort Thompson, South Dakota. In September and October 1804, the Lewis and Clark Expedition passed through what is now Lake Oahe while exploring the Missouri River. Oahe Dam was authorized by the Flood Control Act of 1944, and construction by the United States Army Corps of Engineers began in 1948. The world’s first rock tunnel boring machine (TBM) was invented in 1952 by James S. Robbins for the Oahe Dam project, which marked the beginning of machines replacing human tunnelers. The
McCalls Dam State Park McCalls Dam State Park McCalls Dam State Park is a Pennsylvania state park on in Miles Township, Centre County, Pennsylvania in the United States. The park is in the easternmost tip of Centre County, south of Clinton County and north of Union County. McCalls Dam State Park is in a remote location on a gravel road between R. B. Winter State Park on Pennsylvania Route 192 and Eastville on Pennsylvania Route 880. The park can only be accessed in the winter months by snowmobiling or cross-country skiing. McCalls Dam State Park has a small camping area and a small picnic