Website Jamestown Dam Project - U.S. Bureau of Reclamation
The Jamestown Dam[2] is a rolled-earth dam spanning the James River in Stutsman County in the U.S. state of North Dakota, serving the primary purpose of flood control. It is north of the city of Jamestown, North Dakota.[3] Built from April 1952 to September 1953, the dam measures 1,418 feet (432 m) long at the crest and 85 feet (26 m) high. It impounds the James River to form the Jamestown Reservoir. A small islet lies shortly upstream of the dam, where the James River previously split into two channels.
The dam and reservoir rest on a wide plain of shale where the James River cut a canyon up to 1 mile (1.6 km) wide and 100 feet (30 m) deep. The shale (called Pierre Shale) has a dark gray, bedded appearance, and is mostly claystone or siltstone. The valley also contains many traces of alluvium, mainly deposited during the last ice age when the area was heavily glaciated.
^"Jamestown Dam and Reservoir". U.S. Bureau of Reclamation. Archived from the original on January 18, 2009. Retrieved 2009-02-22.
^"Jamestown Dam". Geographic Names Information System. United States Geological Survey, United States Department of the Interior. Retrieved 2009-02-22.
^"Releases cut from Jamestown Dam". Bismarck Tribune. 20 April 2009. Archived from the original on 18 January 2013. Retrieved 2009-07-10.
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