Illinois River runs warm and high as fall bite builds
The Illinois River gauges near Beardstown read 67°F water temperature at USGS gauge 05586300 this morning, with USGS gauge 05586100 showing 28,700 cfs. That is a lot of moving water for mid-October, and it keeps fish tucked behind current breaks and in slower pockets. Fall is the transition season across the Midwest. Per Tactical Bassin (blog), fish position in predictable ways in the fall, sitting near hard structure such as dock pilings, laydowns and rocks, and the jig bite can be strong this time of year. Fishing the Midwest also points to green, living weeds as a starting point for finding fish as waters cool and weeds die off. Michigan Sportsman Forum chatter on Great Lakes perch is mixed, so we are not leaning on it.
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With the New Moon today, expect low-light feeding windows to be strongest at dawn and dusk, and the dark nights favor an early-morning start. Flow at 28,700 cfs is the main variable. If it holds or eases, fish should settle onto the softer water along banks, behind wing dams and in backwater edges, and the bite should become more consistent through the week.
Water at 67°F is still comfortable for active fish. As nights cool, expect that number to slide and fish to feed harder ahead of the colder stretch. Smallmouth Bass are the species to plan around on rocky banks, and a slower presentation along hard structure fits the fall pattern Tactical Bassin describes. If you want a finesse option, Tactical Bassin also highlights tiny topwater baits, swimbaits and compact jigs for tough days.
A rise in flow would push fish tighter to the bank and reduce visibility, so check the gauge before you launch and adjust to the cleaner water.
Context
Mid-October on the Illinois River and southern Lake Michigan is typically a feeding phase as fish bulk up before winter. Water temperatures in the upper 60s are on the warm side for the date, so the fall pattern may arrive a little later than average. Baitfish concentrate in shallow, protected areas as weeds fade, and predators follow. Check state regs before harvesting.
Synthesized from real-time NOAA buoy data, USGS stream gauges, and current reports across regional fishing blogs, captain updates, and angler forums. Check local regulations before keeping fish. Never trust a single source for a trip decision.
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