Heiser Slough Fishing in Mercer County, Illinois

• Overview

  Heiser Slough lies within the bounds of Mercer County, Illinois. It lies 554 feet above sea level. This is a tiny water, and one quiet approach covers all of it. Most waters listed here for Mercer County are larger. Wapello at 6.8 miles is the nearest place to stop. Then Mediapolis, 15 miles, and Muscatine, 15 miles. A county boundary sits nearby, which can matter for local access rules.

• Where to Fish on Heiser Slough

  Without a survey to go on, judge depth from how the bank falls away. On a natural lake the weed line and the shelf beyond it do the work. Weed, then depth: that is the order to fish a water of this kind. Mercer County records list channel catfish, johnny darter, green sunfish and bighead carp among the fish reported. The county list is broader than any single water. Treat Heiser Slough as a water to read rather than to cover.

• Seasonal Patterns

  Typical July readings run about 75°F; by January the average is down near 22°F. Winter shuts things down for a spell, then spring reopens them fast. Winter locks it down, and mid March brings it back. On the long-run averages the water opens up around mid March and starts locking again about mid December. Fishing peaks soon after break-up and again before the cold returns. It holds true on Heiser Slough more years than not.

• Tackle & Baits

  There is no clear statement anywhere on who can fish it. No car park, ramp or path is recorded within easy reach of the shore. Catfish want bait on the bottom: cut bait or worms, a simple running rig, and patience after dark. Rules differ from one water to the next round here. Signs go up and come down, so check on the day. If the gate is shut, Little Fox Pond at 1.9 miles is the nearest alternative. The position on Heiser Slough is worth confirming on the day.