CASPER, Wyo. (AP) — A federal official who was responsible for managing the North Platte River system in Wyoming and part of Nebraska is retiring.

The Casper Star-Tribune reports (http://bit.ly/t6oArD ) John Lawson is stepping down at the end of the month as Wyoming area manager for the federal Bureau of Reclamation.

Lawson directly manages nine Wyoming reservoirs and supervises operations on about a dozen more from offices in Mills, Wyo., just outside Casper. He joined the bureau in 1974.

His successor hasn't been named.