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Fishing Olson Lake: what the data says
36.8-acre lake near Rockford. The lake tops out around 10 ft. The depth chart is built from real state fisheries GPS surveys, so the humps, channels and drop-offs you see are measured, not guessed. Below is the species-by-species picture, pulled from the same data the map uses.
Largemouth Bass fishing at Olson Lake
Start shallow in spring: largemouth bass sit in 2 to 10 ft that time of year. Summer fish stay in 3 to 10 ft, and winter fish hold in 3 to 10 ft. Shallow bay flat is the standout, a weed flat at roughly 5 ft, rated prime for spring largemouth bass. In summer the feeding windows fall in early morning and the evening. Tie on a texas-rigged 10" worm or a deep-diving crankbait and you're in the game.
| Season | Depth | Best window | Go-to baits |
|---|---|---|---|
| Spring | 2 to 10 ft | dawn & dusk | Spinnerbait, Chatterbait |
| Summer | 3 to 10 ft | dawn & dusk | Texas-rigged 10" worm, Deep-diving crankbait |
| Fall | 3 to 10 ft | midday & dawn | Squarebill crankbait (shad), Spinnerbait |
| Winter | 3 to 10 ft | midday | Blade bait, Jigging spoon |
Muskellunge fishing at Olson Lake
Spring muskellunge on Olson Lake hold shallow, usually 3 to 10 ft. Summer fish stay in 3 to 10 ft, and winter fish hold in 3 to 10 ft. The spot to know is Break off the point, a drop-off in about 3 ft of water that rates prime for muskellunge in fall. In summer the feeding windows fall in the evening and early morning. A double-10 bucktail or a topwater (walk-the-dog / creeper) covers the summer program.
| Season | Depth | Best window | Go-to baits |
|---|---|---|---|
| Spring | 3 to 10 ft | dusk | Smaller bucktail (#8 blades), 6" glide bait |
| Summer | 3 to 10 ft | dusk & dawn | Double-10 bucktail, Topwater (walk-the-dog / creeper) |
| Fall | 3 to 10 ft | midday & dusk | Big rubber (Bull Dawg style), 10"+ glide bait |
| Winter | 3 to 10 ft | midday | Large rubber, crawled slow |
Bluegill fishing at Olson Lake
In spring, bluegill run shallow here, mostly 1 to 6 ft. They move out to 3 to 10 ft in summer and finish the year down in 3 to 10 ft. Shallow bay flat is the standout, a weed flat at roughly 5 ft, rated prime for spring bluegill. Plan around early morning and the evening in the warm months. Tie on a small sponge spider (fly) or a micro tube jig and you're in the game.
| Season | Depth | Best window | Go-to baits |
|---|---|---|---|
| Spring | 1 to 6 ft | midday & dusk | 1/32 oz jig + micro plastic, Tiny popper (evenings) |
| Summer | 3 to 10 ft | dawn & dusk | Small sponge spider (fly), Micro tube jig |
| Fall | 3 to 10 ft | midday | Micro jig + waxworm, Small spoon tipped |
| Winter | 3 to 10 ft | midday | Tungsten ice jig + plastic, Tiny spoon |
Notable structure
- Deep basin: deep basin, around 10 ft
- Shallow bay flat: weed flat, around 5 ft
- Break off the point: drop-off, around 3 ft
- Main-lake point: point, around 2 ft
- Back-bay flat: weed flat, around 2 ft
Common questions
How deep is Olson Lake?
Olson Lake is about 10 ft at its deepest point. The depth chart here comes from real state fisheries GPS surveys, so the contours reflect measured depths.
What fish are in Olson Lake?
Anglers target largemouth bass, bluegill, muskellunge on Olson Lake.
Where is the best fishing spot on Olson Lake?
Shallow bay flat is the top-rated area: a weed flat in about 5 ft of water that rates prime for largemouth bass in spring. Open the map above to see every rated spot for each species and season.
When is the best time to fish Olson Lake?
For largemouth bass, the summer bite is best in early morning and the evening. Each species page section below lists the seasonal windows, and the map shows a live NOW badge when you're inside one.
Nearby waters
Rock River · Shabbona Lake · Boulder Lake · Fox River · Des Plaines River · Illinois River
See how Olson Lake stacks up: best largemouth bass lakes in Illinois · best bluegill lakes in Illinois · best muskellunge lakes in Illinois
Browse all Illinois fishing maps or every water on DepthScout. Bathymetry credit: state fisheries survey programs. How we build these maps. For fishing guidance only, never navigation.