Fishing at Marissa Reservoir, Saint Clair County, Illinois

• Overview

  Illinois holds Marissa Reservoir, in Saint Clair County. It lies 446 feet above sea level. It covers about 13 acres, so this is small water you can walk round in under an hour. Nearest town is Marissa, 1 mile off. The nearest city of size is St. Louis, 36 miles away. You are close to a county edge here; who manages the access can change within a short drive.

• Where to Fish on Marissa Reservoir

  Depth is unmeasured here, so let the shoreline guide you. Standing timber shows when the level drops, and fish sit against it. The arms fish better than the open middle whenever the water is up. County-wide records name bluegill, green sunfish and largemouth bass. Those are county-wide records, so not every one of them will be in this water. Read Marissa Reservoir for ten minutes before the first cast goes out.

• Seasonal Patterns

  Temperature averages peak at 78°F in July and bottom out at 29°F in January. The swings are modest, so patterns change slowly. It is not guaranteed from one year to the next. Autumn steadies things again once the heat lets go. Expect Marissa Reservoir to follow that timing. Spring warms the shallows first, so start there.

• Tackle & Baits

  No public source sets out the position on this bank. Mapping shows an empty shoreline: no ramp, no jetty, no marked entry. For the bass here, soft plastics worked slow along cover and a spinnerbait for searching do most of the work. Ask in the nearest town if you are unsure. Where parking is tight, arriving early solves most problems. The nearest alternative is Marissa Recreation Association South Lake, 1.3 miles out. Confirm before you fish Marissa Reservoir.