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Fishing Castle Rock Flowage: what the data says
13,955-acre flowage near Mauston. The lake tops out around 35 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 Castle Rock Flowage
Start shallow in spring: walleye sit in 4 to 15 ft that time of year. By summer they slide out to 15 to 35 ft, and by winter most fish are in 11 to 35 ft. If you only fish one area, make it Little Yellow River inflow: a inflow / creek mouth around 4 ft that scores prime in spring. In summer the feeding windows fall in the evening and early morning. A crawler harness on bottom bouncer or a deep crankbait (trolled) covers the summer program.
| Season | Depth | Best window | Go-to baits |
|---|---|---|---|
| Spring | 4 to 15 ft | dusk & dawn | 1/8 oz jig + minnow, Hair jig |
| Summer | 15 to 35 ft | dusk & dawn | Crawler harness on bottom bouncer, Deep crankbait (trolled) |
| Fall | 11 to 35 ft | dusk & night | Jigging rap, Jig + big minnow |
| Winter | 11 to 35 ft | dusk & dawn | Jigging spoon + minnow head, Rattle bait |
Crappie fishing at Castle Rock Flowage
In spring, crappie run shallow here, mostly 2 to 8 ft. Summer pushes them deeper, 10 to 25 ft, and winter fish settle into 15 to 35 ft. Old creek channel is the standout, a creek channel at roughly 18 ft, rated prime for fall crappie. Best bite is early morning and the evening. Tie on a jig trolled/spider-rigged or a small crankbait (trolled) and you're in the game.
| Season | Depth | Best window | Go-to baits |
|---|---|---|---|
| Spring | 2 to 8 ft | midday & dawn | 1/16 oz jig + tube, Curly-tail grub |
| Summer | 10 to 25 ft | dawn & dusk | Jig trolled/spider-rigged, Small crankbait (trolled) |
| Fall | 8 to 20 ft | dawn | Jig + minnow combo, Small swimbait (1.5-2") |
| Winter | 15 to 35 ft | midday | Tungsten jig + soft plastic, Tiny jigging spoon |
White Bass & Hybrids fishing at Castle Rock Flowage
Start shallow in spring: white bass & hybrids sit in 3 to 15 ft that time of year. They move out to 10 to 30 ft in summer and finish the year down in 11 to 35 ft. If you only fish one area, make it Little Yellow River inflow: a inflow / creek mouth around 4 ft that scores prime in spring. Plan around early morning and the evening in the warm months. Tie on a jigging spoon or a topwater (when schooling) and you're in the game.
| Season | Depth | Best window | Go-to baits |
|---|---|---|---|
| Spring | 3 to 15 ft | midday & dawn | Rooster tail / inline spinner, Curly-tail jig (white/chartreuse) |
| Summer | 10 to 30 ft | dawn & dusk | Jigging spoon, Topwater (when schooling) |
| Fall | 8 to 25 ft | midday & dawn | Small blade bait, Jigging spoon |
| Winter | 11 to 35 ft | midday | Jigging spoon, Blade bait (vertical) |
Channel Catfish fishing at Castle Rock Flowage
Start shallow in spring: channel catfish sit in 3 to 12 ft that time of year. Summer pushes them deeper, 8 to 25 ft, and winter fish settle into 11 to 35 ft. The spot to know is Little Yellow River inflow, a inflow / creek mouth in about 4 ft of water that rates prime for channel catfish in spring. Plan around after dark and the evening in the warm months.
| Season | Depth | Best window | Go-to baits |
|---|---|---|---|
| Spring | 3 to 12 ft | dusk | |
| Summer | 8 to 25 ft | night & dusk | |
| Fall | 10 to 30 ft | dusk | |
| Winter | 11 to 35 ft | midday |
Flathead Catfish fishing at Castle Rock Flowage
Spring flathead catfish on Castle Rock Flowage hold shallow, usually 5 to 20 ft. Summer pushes them deeper, 8 to 30 ft, and winter fish settle into 11 to 35 ft. The spot to know is Deep basin, a deep basin in about 30 ft of water that rates prime for flathead catfish in fall. In summer the feeding windows fall in after dark and the evening.
| Season | Depth | Best window | Go-to baits |
|---|---|---|---|
| Spring | 5 to 20 ft | night & dusk | |
| Summer | 8 to 30 ft | night & dusk | |
| Fall | 10 to 35 ft | night & dusk | |
| Winter | 11 to 35 ft | midday |
Smallmouth Bass fishing at Castle Rock Flowage
In spring, smallmouth bass run shallow here, mostly 3 to 12 ft. Summer pushes them deeper, 10 to 30 ft, and winter fish settle into 11 to 35 ft. The spot to know is Rock reef, a rock pile in about 4.722667581220551 ft of water that rates prime for smallmouth bass in spring. In summer the feeding windows fall in early morning and the evening. A drop shot (goby/minnow) or a ned rig covers the summer program.
| Season | Depth | Best window | Go-to baits |
|---|---|---|---|
| Spring | 3 to 12 ft | dawn & dusk | Ned rig, Tube jig |
| Summer | 10 to 30 ft | dawn & dusk | Drop shot (goby/minnow), Ned rig |
| Fall | 8 to 25 ft | midday & dawn | Jerkbait, Blade bait |
| Winter | 11 to 35 ft | midday | Blade bait, Hair jig |
Castle Rock Flowage also holds bluegill (4 to 15 ft in summer), freshwater drum (8 to 30 ft in summer). Pick any of them on the map above for rated spots and bait picks.
Notable structure
- Deep basin: deep basin, around 30 ft
- Old creek channel: creek channel, around 18 ft
- Break off the point: drop-off, around 16 ft
- Feeding flat: feeding flat, around 15.39462396937403 ft
- Main-lake point: point, around 9 ft
- Secondary point: point, around 9 ft
- Marina / dock area: dock line, around 7 ft
- Rock reef: rock pile, around 4.722667581220551 ft
- Shallow bay flat: weed flat, around 4 ft
- Back-bay flat: weed flat, around 4 ft
- Little Yellow River inflow: inflow / creek mouth, around 4 ft
- Big Roche a Cri Creek inflow: inflow / creek mouth, around 4 ft
- Rock reef: rock pile, around 3.435991279606972 ft
- Rock reef: rock pile, around 2.9876344171270706 ft
Common questions
How deep is Castle Rock Flowage?
Castle Rock Flowage is about 35 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 Castle Rock Flowage?
Anglers target smallmouth bass, walleye, crappie, bluegill, channel catfish, white bass & hybrids, flathead catfish, freshwater drum on Castle Rock Flowage.
Where is the best fishing spot on Castle Rock Flowage?
Little Yellow River 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 Castle Rock Flowage?
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
Petenwell Flowage · Wisconsin River (Dells) · Kickapoo River · Lake Wisconsin · Lower Wisconsin River · Big Eau Pleine Reservoir
See how Castle Rock Flowage stacks up: best smallmouth bass lakes in Wisconsin · best walleye lakes in Wisconsin · best crappie lakes in Wisconsin · best bluegill lakes in Wisconsin
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