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Fishing Blue Lake: what the data says
642-acre lake near Monona County. Iowa DNR survey water. 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. Here is how the season plays out for each species, straight from the data behind the map.
Largemouth Bass fishing at Blue 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. If you only fish one area, make it Shallow bay flat: a weed flat around 4 ft that scores prime in spring. Best bite is 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 |
Bluegill fishing at Blue Lake
Start shallow in spring: bluegill sit in 1 to 6 ft that time of year. By summer they slide out to 3 to 10 ft, and by winter most fish are in 3 to 10 ft. If you only fish one area, make it Shallow bay flat: a weed flat around 4 ft that scores prime in spring. In summer the feeding windows fall in early morning and the evening. A small sponge spider (fly) or a micro tube jig covers the summer program.
| 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 |
Crappie fishing at Blue Lake
In spring, crappie run shallow here, mostly 2 to 8 ft. Summer pushes them deeper, 3 to 10 ft, and winter fish settle into 3 to 10 ft. Deep basin is the standout, a deep basin at roughly 10 ft, rated prime for winter crappie. Plan around early morning and the evening in the warm months. Summer baits: a jig trolled/spider-rigged or a small crankbait (trolled) gets it done.
| Season | Depth | Best window | Go-to baits |
|---|---|---|---|
| Spring | 2 to 8 ft | midday & dawn | 1/16 oz jig + tube, Curly-tail grub |
| Summer | 3 to 10 ft | dawn & dusk | Jig trolled/spider-rigged, Small crankbait (trolled) |
| Fall | 3 to 10 ft | dawn | Jig + minnow combo, Small swimbait (1.5-2") |
| Winter | 3 to 10 ft | midday | Tungsten jig + soft plastic, Tiny jigging spoon |
Yellow Perch fishing at Blue Lake
Start shallow in spring: yellow perch sit in 3 to 10 ft that time of year. Summer fish stay in 3 to 10 ft, and winter fish hold in 3 to 10 ft. If you only fish one area, make it Shallow bay flat: a weed flat around 4 ft that scores prime in spring. Best bite is early morning. A drop-shot micro plastics or a small spoon tipped with worm covers the summer program.
| Season | Depth | Best window | Go-to baits |
|---|---|---|---|
| Spring | 3 to 10 ft | midday & dawn | Small jig + curly tail, Perch-pattern micro crank |
| Summer | 3 to 10 ft | dawn | Drop-shot micro plastics, Small spoon tipped with worm |
| Fall | 3 to 10 ft | midday | Jigging spoon (small), Perch rig / spreader |
| Winter | 3 to 10 ft | midday & dawn | Tungsten jig + spikes, Rattle spoon (small) |
Channel Catfish fishing at Blue Lake
In spring, channel catfish run shallow here, mostly 3 to 10 ft. Summer fish stay in 3 to 10 ft, and winter fish hold in 3 to 10 ft. Deep basin is the standout, a deep basin at roughly 10 ft, rated prime for winter channel catfish. Best bite is after dark and the evening.
| Season | Depth | Best window | Go-to baits |
|---|---|---|---|
| Spring | 3 to 10 ft | dusk | |
| Summer | 3 to 10 ft | night & dusk | |
| Fall | 3 to 10 ft | dusk | |
| Winter | 3 to 10 ft | midday |
Notable structure
- Deep basin: deep basin, around 10 ft
- Back-bay flat: weed flat, around 5 ft
- Shallow bay flat: weed flat, around 4 ft
- Main-lake point: point, around 2 ft
- Secondary point: point, around 2 ft
- Break off the point: drop-off, around 2 ft
Common questions
How deep is Blue Lake?
Blue 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 Blue Lake?
Anglers target largemouth bass, crappie, bluegill, channel catfish, yellow perch on Blue Lake.
Where is the best fishing spot on Blue Lake?
Shallow bay flat is the top-rated area: a weed flat in about 4 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 Blue 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
Snyder Bend Lake · Loess Hills State Forest - Jones Creek · Browns Lake · Oldham Lake · Willow Lake · DeSoto Bend at DeSoto National Wildlife Refuge
See how Blue Lake stacks up: best largemouth bass lakes in Iowa · best crappie lakes in Iowa · best bluegill lakes in Iowa · best channel catfish lakes in Iowa
Browse all Iowa fishing maps or every water on DepthScout. Bathymetry credit: state fisheries survey programs. How we build these maps. For fishing guidance only, never navigation.