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Rockford to Sterling-Rock Falls: walleye below every dam and some of Illinois' best flathead water. The river tops out around 15 ft. This chart interpolates between a real shoreline and a known maximum depth. It will point you at likely water, but it is not a navigation product. The rest of this page walks each species through its year, using the map's own scoring.
The drawn water covers 3,665 acres wrapped in 125.9 miles of bank. An index of 14.8 puts the bank firmly in maze territory: point after pocket after cove, every one a casting target. Call it 45 mi long by 7 mi wide at the broadest reach. Ogle County claims this one. If the bite dies, Pierce Lake is 31 mi to the northeast.
Spring puts walleye in skinny water — 4 to 15 ft is the zone. Summer fish stay in 5 to 15 ft, and winter fish hold in 5 to 15 ft. Spring walleye concentrate at Kishwaukee River confluence, a prime-rated inflow / creek mouth around 8 ft. Warm-month bites cluster around the evening and early morning. A crawler harness on bottom bouncer or a deep crankbait (trolled) covers the summer program.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 4 to 15 ft | dusk & dawn | Kishwaukee River confluence (8 ft) | 1/8 oz jig + minnow, Hair jig |
| Summer | 5 to 15 ft | dusk & dawn | Lowhead weir tailrace (13 ft) | Crawler harness on bottom bouncer, Deep crankbait (trolled) |
| Fall | 5 to 15 ft | dusk & night | Lowhead weir tailrace (13 ft) | Jigging rap, Jig + big minnow |
| Winter | 5 to 15 ft | dusk & dawn | Lowhead weir tailrace (13 ft) | Jigging spoon + minnow head, Rattle bait |
Come spring, look for flathead catfish tight to the bank in 4 to 15 ft. Through summer count on 4 to 15 ft; the winter hold is 5 to 15 ft. If you only fish one area, make it Tailout eddy (mile 62.8): an eddy pocket around 8 ft that scores prime in spring. Best bite is after dark and the evening.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 4 to 15 ft | night & dusk | Tailout eddy (mile 62.8) (8 ft) | |
| Summer | 4 to 15 ft | night & dusk | Tailout eddy (mile 62.8) (8 ft) | |
| Fall | 4 to 15 ft | night & dusk | Tailout eddy (mile 62.8) (8 ft) | |
| Winter | 5 to 15 ft | midday | Tailout eddy (mile 62.8) (8 ft) |
When the water first warms, channel catfish slide up into 3 to 12 ft. By summer they slide out to 5 to 15 ft, and by winter most fish are in 5 to 15 ft. If you only fish one area, make it Kishwaukee River confluence: an inflow / creek mouth around 8 ft that scores prime in spring. In summer the feeding windows fall in after dark and the evening.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 12 ft | dusk | Kishwaukee River confluence (8 ft) | |
| Summer | 5 to 15 ft | night & dusk | Fordam dam tailrace (Rockford) (11 ft) | |
| Fall | 5 to 15 ft | dusk | Fordam dam tailrace (Rockford) (11 ft) | |
| Winter | 5 to 15 ft | midday | Fordam dam tailrace (Rockford) (11 ft) |
In spring, white bass run shallow here, mostly 2 to 12 ft. Midsummer fish sit out in 5 to 15 ft before dropping to 5 to 15 ft for winter. Spring white bass concentrate at Kishwaukee River confluence, a prime-rated inflow / creek mouth around 8 ft. Fish it in early morning and the evening and you'll meet the bite. You won't need more than a slab spoon or a small topwater (schooling fish) most summer days.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 12 ft | dawn & dusk | Kishwaukee River confluence (8 ft) | Curly-tail jig (white), Small lipless crank |
| Summer | 5 to 15 ft | dawn & dusk | Lowhead weir tailrace (13 ft) | Slab spoon, Small topwater (schooling fish) |
| Fall | 4 to 15 ft | dawn & dusk | Lowhead weir tailrace (13 ft) | Jigging spoon, Blade bait |
| Winter | 5 to 15 ft | midday | Lowhead weir tailrace (13 ft) | Jigging spoon (deep), Blade bait |
Come spring, look for smallmouth bass tight to the bank in 3 to 12 ft. Expect a summer slide to 5 to 15 ft, then a winter hold in 5 to 15 ft. Start at Byron rapids. It's a rock pile holding about 6 ft of water and rates prime come spring. Prime time lands in early morning and the evening. A drop shot (goby/minnow) or a ned rig is the honest summer answer here.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 3 to 12 ft | dawn & dusk | Byron rapids (6 ft) | Ned rig, Tube jig |
| Summer | 5 to 15 ft | dawn & dusk | Byron rapids (6 ft) | Drop shot (goby/minnow), Ned rig |
| Fall | 5 to 15 ft | midday & dawn | Byron rapids (6 ft) | Jerkbait, Blade bait |
| Winter | 5 to 15 ft | midday | Current seam (mile 31.1) (8 ft) | Blade bait, Hair jig |
Come spring, look for northern pike tight to the bank in 2 to 8 ft. Expect a summer slide to 5 to 15 ft, then a winter hold in 5 to 15 ft. Start at Kishwaukee River confluence. It's an inflow / creek mouth holding about 8 ft of water and rates prime come spring. Prime time lands in early morning and the evening. A bucktail or a weedless spoon over cabbage is the honest summer answer here.
| Season | Depth | Best window | Start at | Go-to baits |
|---|---|---|---|---|
| Spring | 2 to 8 ft | midday & dawn | Kishwaukee River confluence (8 ft) | #5 inline spinner, Spoon (red/white) |
| Summer | 5 to 15 ft | dawn & dusk | Current seam (mile 31.1) (8 ft) | Bucktail, Weedless spoon over cabbage |
| Fall | 5 to 15 ft | midday & dawn | Current seam (mile 31.1) (8 ft) | Big rubber (Bull Dawg style), Husky-style jerkbait |
| Winter | 5 to 15 ft | midday | Current seam (mile 31.1) (8 ft) | Tip-ups, Large jigging spoon |
Rock River also holds freshwater drum (4 to 15 ft in summer), common carp (3 to 15 ft in summer). Pick any of them on the map above for rated spots and bait picks.
Structure-wise the chart holds 39 features, led in depth by Lowhead weir tailrace at roughly 13 ft.
Access data: OpenStreetMap contributors (ODbL) — community-mapped launches. Confirm conditions and fees locally before you launch.
Season dates, license requirements, and size and bag limits for Illinois waters are set by the Illinois DNR — and special regulations can apply to Rock River specifically, so confirm the current rules before you fish.
Check the official Illinois fishing regulations →
Rock River is about 15 ft (5 m) deep at its deepest point. The contours here are modeled from the water's real shape and maximum depth, so treat them as a rough guide.
Anglers target walleye, flathead catfish, channel catfish, white bass, smallmouth bass, northern pike, freshwater drum, common carp on Rock River.
Kishwaukee River confluence is the top-rated area: an inflow / creek mouth in about 8 ft of water that rates prime for walleye in spring. The map above holds the full rated-spot list for every species and season.
For walleye, the summer bite is best in the evening and early morning. Each species page section below lists the seasonal windows, and the map shows a live NOW badge when you're inside one.
Fishing on Rock River is regulated by the Illinois DNR. Check the official Illinois regulations for current license requirements, season dates, and size and bag limits — special regulations can apply to this specific water.
Pierce Lake 31 mi · Olson Lake 32 mi · Shabbona Lake 33 mi · Zander Lake 43 mi, WI · Beckman Lake 43 mi, WI · Decatur Lake 44 mi, WI · Horseshoe Lake 45 mi, WI · Mississippi River Pool 13 (Clinton) 46 mi, IA/IL · Rock River (WI) 47 mi, WI · Lions Park Pond 49 mi, WI · Kiwanis Pond 50 mi, WI · Lake Montesian 51 mi, WI
See how Rock River stacks up: best smallmouth bass lakes in Illinois · best walleye lakes in Illinois · best white bass lakes in Illinois · best northern pike lakes in Illinois
Browse all Illinois fishing maps or see every water on DepthScout. How we build these maps. Fish here with a sonar unit that logs? Send us your depth data and we'll improve this chart, credited to you. For fishing guidance only, never navigation.