Here on the Kootenai River, we see our first significant hatches in March and April. The water is cold, the rainbow trout are spawning in the main river, and you can expect some discoloration in the water as a result of runoff from tributaries entering the Kootenai River below the dam. On sunny days, we do see that dry fly action that’s been dormant for over 4 or more months. We get little blue quill, chironomid, blue winged olive, and tiny olive stone hatches throughout March and April depending on the flow and weather conditions. Check out this little blue quill hatch we had a few years ago in April!