Winter Wyoming fly fishing at its best. Grey Reef is fishing very good with nymph rigs and streamer rigs. Nymphs are very consistent and the streamer activity fluctuates from good to very good. The North Platte River was slushy below Government Bridge yesterday and fully iced at the Narrows. Expect portions of  upper Grey Reef to freeze over with our approaching chilly front. It will be below zero tomorrow eve with a high a couple degrees below zero on Wednesday. Wednesday night will be -10* or so. Thursday and Friday also look chilly.