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Fishing Lake Koshkonong: what the data says
10,460-acre flowage near Fort Atkinson. The lake tops out around 7 ft. The contours are modeled from the water's real shoreline and maximum depth. Treat them as a rough guide, and never use them for navigation. What follows comes from the same scoring engine that paints the spots above.
Walleye fishing at Lake Koshkonong
In spring, walleye run shallow here, mostly 2 to 7 ft. Summer fish stay in 2 to 7 ft, and winter fish hold in 2 to 7 ft. If you only fish one area, make it Creek inflow: a inflow / creek mouth around 4 ft that scores prime in spring. Best bite is the evening and early morning. Summer baits: a crawler harness on bottom bouncer or a deep crankbait (trolled) gets it done.
| Season | Depth | Best window | Go-to baits |
|---|---|---|---|
| Spring | 2 to 7 ft | dusk & dawn | 1/8 oz jig + minnow, Hair jig |
| Summer | 2 to 7 ft | dusk & dawn | Crawler harness on bottom bouncer, Deep crankbait (trolled) |
| Fall | 2 to 7 ft | dusk & night | Jigging rap, Jig + big minnow |
| Winter | 2 to 7 ft | dusk & dawn | Jigging spoon + minnow head, Rattle bait |
Crappie fishing at Lake Koshkonong
Spring crappie on Lake Koshkonong hold shallow, usually 2 to 7 ft. Summer fish stay in 2 to 7 ft, and winter fish hold in 2 to 7 ft. Old creek channel is the standout, a creek channel at roughly 4 ft, rated prime for fall crappie. Plan around early morning and the evening in the warm months. A jig trolled/spider-rigged or a small crankbait (trolled) covers the summer program.
| Season | Depth | Best window | Go-to baits |
|---|---|---|---|
| Spring | 2 to 7 ft | midday & dawn | 1/16 oz jig + tube, Curly-tail grub |
| Summer | 2 to 7 ft | dawn & dusk | Jig trolled/spider-rigged, Small crankbait (trolled) |
| Fall | 2 to 7 ft | dawn | Jig + minnow combo, Small swimbait (1.5-2") |
| Winter | 2 to 7 ft | midday | Tungsten jig + soft plastic, Tiny jigging spoon |
White Bass & Hybrids fishing at Lake Koshkonong
Spring white bass & hybrids on Lake Koshkonong hold shallow, usually 1 to 7 ft. Summer fish stay in 2 to 7 ft, and winter fish hold in 2 to 7 ft. The spot to know is Creek inflow, a inflow / creek mouth in about 4 ft of water that rates prime for white bass & hybrids in spring. Best bite is early morning and the evening. Summer baits: a jigging spoon or a topwater (when schooling) gets it done.
| Season | Depth | Best window | Go-to baits |
|---|---|---|---|
| Spring | 1 to 7 ft | midday & dawn | Rooster tail / inline spinner, Curly-tail jig (white/chartreuse) |
| Summer | 2 to 7 ft | dawn & dusk | Jigging spoon, Topwater (when schooling) |
| Fall | 2 to 7 ft | midday & dawn | Small blade bait, Jigging spoon |
| Winter | 2 to 7 ft | midday | Jigging spoon, Blade bait (vertical) |
Channel Catfish fishing at Lake Koshkonong
In spring, channel catfish run shallow here, mostly 2 to 7 ft. Summer fish stay in 2 to 7 ft, and winter fish hold in 2 to 7 ft. If you only fish one area, make it Creek inflow: a inflow / creek mouth around 4 ft that scores prime in spring. In summer the feeding windows fall in after dark and the evening.
| Season | Depth | Best window | Go-to baits |
|---|---|---|---|
| Spring | 2 to 7 ft | dusk | |
| Summer | 2 to 7 ft | night & dusk | |
| Fall | 2 to 7 ft | dusk | |
| Winter | 2 to 7 ft | midday |
Flathead Catfish fishing at Lake Koshkonong
Spring flathead catfish on Lake Koshkonong hold shallow, usually 2 to 7 ft. Summer fish stay in 2 to 7 ft, and winter fish hold in 2 to 7 ft. The spot to know is Deep basin, a deep basin in about 6 ft of water that rates prime for flathead catfish in fall. Best bite is after dark and the evening.
| Season | Depth | Best window | Go-to baits |
|---|---|---|---|
| Spring | 2 to 7 ft | night & dusk | |
| Summer | 2 to 7 ft | night & dusk | |
| Fall | 2 to 7 ft | night & dusk | |
| Winter | 2 to 7 ft | midday |
Largemouth Bass fishing at Lake Koshkonong
In spring, largemouth bass run shallow here, mostly 1 to 7 ft. Summer fish stay in 2 to 7 ft, and winter fish hold in 2 to 7 ft. If you only fish one area, make it Shallow bay flat: a weed flat around 3 ft that scores prime in spring. In summer the feeding windows fall in early morning and the evening. A texas-rigged 10" worm or a deep-diving crankbait covers the summer program.
| Season | Depth | Best window | Go-to baits |
|---|---|---|---|
| Spring | 1 to 7 ft | dawn & dusk | Spinnerbait, Chatterbait |
| Summer | 2 to 7 ft | dawn & dusk | Texas-rigged 10" worm, Deep-diving crankbait |
| Fall | 2 to 7 ft | midday & dawn | Squarebill crankbait (shad), Spinnerbait |
| Winter | 2 to 7 ft | midday | Blade bait, Jigging spoon |
Lake Koshkonong also holds bluegill (2 to 7 ft in summer), freshwater drum (2 to 7 ft in summer), common carp (1 to 7 ft in summer). Pick any of them on the map above for rated spots and bait picks.
Notable structure
- Main-lake point: point, around 8 ft
- Secondary point: point, around 8 ft
- Deep basin: deep basin, around 6 ft
- Creek inflow: inflow / creek mouth, around 4 ft
- Koshkonong Creek inflow: inflow / creek mouth, around 4 ft
- Old creek channel: creek channel, around 4 ft
- Sharp break: drop-off, around 3.890635925542983 ft
- Shallow bay flat: weed flat, around 3 ft
- Back-bay flat: weed flat, around 3 ft
- Break off the point: drop-off, around 3 ft
- Weed flat: weed flat, around 2 ft
- Marina / dock area: dock line, around 1 ft
Common questions
How deep is Lake Koshkonong?
Lake Koshkonong is about 7 ft 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.
What fish are in Lake Koshkonong?
Anglers target largemouth bass, walleye, crappie, bluegill, channel catfish, white bass & hybrids, flathead catfish, freshwater drum, common carp on Lake Koshkonong.
Where is the best fishing spot on Lake Koshkonong?
Creek inflow is the top-rated area: a inflow / creek mouth in about 4 ft of water that rates prime for walleye in spring. Open the map above to see every rated spot for each species and season.
When is the best time to fish Lake Koshkonong?
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.
Nearby waters
Lake Kegonsa · Lake Waubesa · Delavan Lake · Lake Monona · Lake Mendota · Geneva Lake
See how Lake Koshkonong stacks up: best largemouth bass lakes in Wisconsin · best walleye lakes in Wisconsin · best crappie lakes in Wisconsin · best bluegill lakes in Wisconsin
Browse all Wisconsin fishing maps or every water on DepthScout. How we build these maps. For fishing guidance only, never navigation.