It doesnt really matter which stream you are looking to fish in Southwest Montana, they are all running low. Flows on the Big Hole are at historical lows for this date. Flows on the Beaverhead are at their winter level still, but should start to rise as we enter the month of May. Moisture, in the form of snow and rain, over the next week should bring the rivers up some. That in no ways means that the fishing is slow.
Beaverhead River - The Beaverhead is still low, but abundant Blue Wing Olive hatches on cloudy afternoons are providing some dry fly activity. When the fish aren't on the baetis, try hot head sowbugs and zebra midges. We should see the epic caddis hatch by by the end of next week as temperatures rise into the low 60's for a couple of days.
Big Hole River - Low flows come with a silver lining. Cool temperatures and moisture are combining to make for better flows as the summer moves on. There are a few skwalla stones still hanging around, but small San Juan worms, Pat's Stones, and olive perdigons are providing the most consistent action. Streamers are taking some good fish on cloudy days.