Green River trout and smallmouth hold steady in cooling fall water

What's biting

What's next

Expect little change over the next two to three days. Water in the upper 40s will keep metabolism low, so plan around the warmest part of the afternoon rather than dawn. Midday sun nudges temperatures up a degree or two, and that is when Brown Trout and Smallmouth Bass are most likely to move and eat.

With the First Quarter moon, the half-lit night sky gives a modest feeding bump around dusk. Evening is worth a late session, especially on the gauge sites reading 50°F, which are the warmest water we have numbers for.

Flows differ a lot between sites. The 4,200 cfs reading is heavy water, so fish will sit tight to seams, eddies and slower inside bends instead of the main current. At 2,170 cfs the water is easier to read and wade. Per Tactical Bassin (blog), fall bass respond to a swimbait with a blade for flash and vibration, a useful option when fish are chasing baitfish in cooling water. Check state regulations before keeping any fish.

Context

Mid-October is the transition from fall feeding to early winter patterns in northern Utah's high-desert rivers and reservoirs. Water in the upper 40s is typical for this point in the calendar. Brown Trout are generally in their pre-spawn and spawn period around now, so they can be aggressive but also sensitive to pressure. Smallmouth Bass usually pull toward deeper, slower water as temperatures slide, and the bite compresses into a narrower midday window. Ahead of winter, anglers typically downsize and slow presentations.