Central Nebraska Public Power and Irrigation District officials in Holdrege say the Federal Energy Regulatory Commission have
approved the district's request.
The lake will be allowed to hold an extra 2 feet in elevation if needed to prevent or slow downstream flooding.
That extra 2 feet equals about 62,000 acre-feet of water. An acre-foot is the amount needed to cover an acre of ground with a foot of water - about 326,000 gallons.
U.S. Bureau of Reclamation officials have been releasing water from Wyoming reservoirs, anticipating heavy runoff from an above-normal snowpack in the Rockies.
McConaughy, which sits north of Ogallala in western Nebraska, is
about 95 percent full now. In recent years because of drought and irrigation demands, the lake shrank well below 50% capacity with devastating economic impact on the area recreational industry.