Grey Reef is a tail water of the North Platte River off Grey Reef Dam below Alcova Reservoir. This tail water stays open and fishable year round with winter flows around 500 CFS and high water flows during run off and flush up to 6000 or 7000 CFS each year. Known for its opportunity for big browns and rainbows this is a stretch of water every angle should fish at least ones in there life. With several access bank fishing is available but many stretches are only fishable while floating the river.
Most up to date flows can be found here:
BOR flows at Gray Reef Dam