The main reason is that as the stream comes out of Bridgeport Reservoir where the water is warmer and it has a tendency to cool as it goes down stream into Nevada which is around 15 miles downstream of the outflow. It can even ice over and does often in the winter when the flows are low.

The flows are 25 CFS coming out of the lake. This is really low but common for this time of year. There have been some really good reports of fish being caught on a variety of small nymphs and midges in sizes 18-20. Baetis nymphs in Olive and black and any darker colored midge pupa will do the trick. Getting a good dead drift in the slower deeper water is the key. Cover water slowly and make a few extra drifts. Fish will not move much to eat so you have to cover ground slowly.