Cook County · reservoir · 20 acres
Lake Cosman
Lake Cosman is a reservoir in Cook County, Illinois. FishableWaters aggregates every stocking record for this water from Illinois's fish & wildlife agency; the latest schedule and today's bite windows are above.
Best days this week
Days near a new or full moon tend to fish best.
Today's bite windows
Conditions, next 3 days
Today
Drizzle
84°
65°
13 mph
61%
Sat
Rain
71°
67°
12 mph
86%
Sun
Drizzle
76°
65°
14 mph
37%
↘ pressure fallingFalling pressure ahead of a front often turns the bite on.
Stocking ledger
No published stocking records yet. This water stays in our books — the ledger begins the hour its state agency publishes a record.
Angler reports
What's biting
No reports yet — be the first
Best bite times
No reports yet
Field notes
No notes yet
Nearby waters
- Busse Woods Reservoir0.6 mi
- West Branch Salt Creek0.8 mi
- Busse Lake1.1 mistocked Jan 1, 2026
- South Pool1.1 mi
- North Pool1.6 mi
- Spring Brook2.9 mi
- Meacham Creek3.5 mi
- Lake Kadijah3.7 mi
Seasons, limits, and rules are the state's call — check the official IL regulations and buy your license before you go. We link the source; we never restate the rules.
Lake Cosman fishing — FAQ
Do I need a license to fish Lake Cosman?+
Yes — Illinois requires a fishing license. Buy one from the state and check current seasons and limits before you go; both are linked on this page.
Where is Lake Cosman?+
Lake Cosman is a reservoir in Cook County, Illinois. Driving directions and an interactive topo map are on this page.