After the Burlington Railroad reached Sheridan, Wyo. in 1892, coal camps—company towns for miners and their families—were established next to a series of mines north of the town. The mines served local and regional markets as well as the railroad. By 1910, a total of around 10,000 people lived in these camps—Dietz, Kooi, Monarch, Acme and Carneyville, later renamed Kleenburn—more than lived in Sheridan. A busy electric railway ran the 15 miles from town to the camps and back. Most of the miners were immigrants, more than half of them Polish, and their descendants still play vital roles in Sheridan County today.

Alcova Dam, a Bureau of Reclamation project, was completed in 1937. The reservoir opened in 1938 and a power plant was completed in 1955. The $20 million dam project didn’t achieve the high expectations of immense wealth that were forecast at the time of its inception, but continues to provide irrigation water for farmers and ranchers and generates hydropower for the area. Alcova Reservoir offers fishing, boating, camping and swimming opportunities for visitors.

Boysen Dam, named for local businessman Asmus Boysen, was constructed on the Wind River in the 1940s to control flooding and to provide irrigation water for agricultural purposes. The dam was completed in early 1953 and its power plant continues to generate electricity today. Boysen Reservoir provides recreational opportunities as well.

The Powder River Basin sports a colorful history. Bones of bison slaughtered by people, found south of Sundance, Wyo., date back 6,000 years, and northeast Wyoming remained a favorite hunting ground for American Indians into the late 19th century. At that time the Powder River Basin was the scene of violent conflicts between the Indians and U.S. military men. Abundant grass made this region a favored spot for cattle and sheep ranchers. Under the grass is coal—so much of it that about 40 percent of the coal mined in the U.S., comes from the Powder River Basin.

Although the Teapot Dome Scandal of the 1920s was named for a Wyoming rock formation resembling a teapot, the wrongdoers were not from the state. During the administration of President Warren G. Harding, oilmen Harry Sinclair and Edward Doheny bribed Secretary of the Interior Albert Fall to gain access to the naval petroleum reserves located at Teapot Dome in the Salt Creek field north of Casper in northern Natrona County. Fall was the first Cabinet official to be imprisoned for crimes committed during his time in office. Sinclair also served a jail sentence.