I have been heading out to shoot lately either just before sunrise or after sunset. The images below were taken after sunset on the Big Wood. I put on my waders and placed the tripod in the river usually just in front of a small wave or riffle. I used a 14-24 mm 2.8 lens. It was a little tough as my lens consistently got splashed from waves. I found MANY midges on the snowy river bank. I was in Hailey. The storm that dropped 13" of new snow has moved on and it's now sunny and about 21 degrees. The highs all week are supposed to be near 30 which should make for a productive outing to the river if you are considering a little fishing.
Here's a link to a photographer whose work is really outstanding: http://www.davidburdeny.com/ David Burdeny is often up at Gilman Contemporary in Ketchum (http://www.gilmancontemporary.com/).