Lake Cosman, Illinois: Fishing Spots and Seasons

• Overview

  Lake Cosman belongs to Cook County, Illinois. The surface lies 692 feet up. Small at around 20 acres: two anglers spread out cover most of it. Elk Grove Village lies 2.2 miles from the water. It is 14 miles to Elgin, the nearest city. The county line runs close by, so rules can change within a short drive. It goes down as a reservoir on the record.

• Where to Fish on Lake Cosman

  Open data we checked carries no depth for this water. Rip-rap along the wall holds fish that the open bank never does. Look for where the old bank line still shows under the surface. Reported across Cook County: common carp, bluegill and green sunfish. County records show what lives in the area; the local agency holds the water-by-water list. Lake Cosman gives up more to patience than to distance.

• Seasonal Patterns

  Averages here run 74°F at the top of summer and 22°F at the bottom of winter. The year runs cold to warm and back, with clear transitions. Break-up comes around late March, and the run that follows is short and strong. Break-up near late March, freeze-up near mid December: that is the shape of an average year. Late spring and early autumn carry the year between them. Plan any trip to Lake Cosman around it.

• Tackle & Baits

  The paperwork position is blank for this one. There is somewhere to leave the car, half a mile off. Mapping shows a jetty some 0.9 miles off. Somewhere to sit and eat is 0.9 miles out. There are toilets mapped about half a mile away. For the carp, bait a margin spot and sit on it; corn and bread still work. Where a permit is needed, the nearest town usually sells it. Fishing rules and camping rules are set separately here. For a change of water, Busse Lake is 1 mile distant. Check the position at Lake Cosman before loading the car.