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Wisconsin

Lake Winnebago

Lake Winnebago is a broad, shallow lake in eastern Wisconsin and one of the largest inland waters in the state — open, wind-exposed water where largemouth bass relate to weed and shoreline structure.

Surface
131,995acres
Max depth
21ft
Primary species
Largemouth
§ 01Today on the water · Lake Winnebagovia Open-Meteo · 11:45 local
Air temp
75.2°F
Barometric
29.79″
↓falling 24h(-0.22)
Wind
22mph
from WNW
Moon
Waxing Crescent
day 4.0 · 17% lit

Air conditions sampled near the lake center, not measured on the water · refreshed ~15 min

§ 03Next 3 daysvia Open-Meteo · interpretation
  1. 18
    julSat

    Tougher window

    hi 82° · lo 69°

    Pick the calmest hour and stay flexible. Conditions push hard today; bite likely shrinks. Plan around the calmest gap.

    ── strong nw wind · bite likely shrinks

  2. 19
    julSun

    Watch the wind

    hi 81° · lo 68°

    Lean into wind-fed shorelines, all day. Wind drives bait position today; pick the shoreline taking it.

    ── stiff se wind · direction shift overnight

  3. 20
    julMon

    Better early

    hi 82° · lo 61°

    Pre-dawn through 9am. Get on the water before the front; the bite likely shrinks once precip starts.

    ── front rolling in · sw wind setting up

§ 04Field notesWisconsin

Where it is

Lake Winnebago is a large lake in eastern Wisconsin, covering roughly 131,995 surface acres. It is shallow for its size, reaching only about 21 feet at its deepest, so most of the basin is open, wind-exposed water rather than deep structure. That shape sets the pattern here: largemouth bass live around vegetation and shoreline features rather than offshore depth.

Seasonal pattern

Spring. As the shallows warm first, largemouth bass push toward protected bays, shoreline cover, and the first green weed. Fish move up to spawn once water temperatures settle.

Summer. Bass hold on remaining weed edges, hard-bottom transitions, and shorelines the wind has been working. On open shallow water, the low-light hours tend to fish best.

Fall. Cooling water pulls baitfish and bass back toward shallow flats and the edges of dying weed. Movement can be wide, so covering water helps.

Winter. Activity slows and fish relate to the more stable parts of the basin. The read is subtle on a shallow lake; a slow, deliberate approach is the safer one.

Key structure

  • Broad weed flats and their outer edges
  • Wind-driven shorelines that concentrate bait
  • Soft-bottom-to-hard-bottom transitions
  • Scattered rock and any isolated hard cover

Because this is a shallow natural lake, vegetation does most of the work; depth-based structure is limited.

Forage

Panfish and soft-rayed baitfish dominate a big, shallow system like this. Largemouth bass key on those forage concentrations along weed lines and wind-blown banks.

Access

Public access points exist around Lake Winnebago. Wind, water level, and the time of year all change what is practical from one ramp to the next, so confirm current conditions before settling on a launch.

Regulations

Check current state and local regulations before fishing; limits and seasons can change.

§ 05Sources & field guides

Field guides

Data & references

  • Today's conditions — Open-Meteo, refreshed every ~15 min
  • Moon phase — local astronomical calculation, no external API
  • Lake area, depth, structure — Identity, surface area, coordinates and county/state from the ProjectD canonical waterbody index (snapshot conus-20260518-v1, group gnis:01576879). Maximum depth recorded in the Phase 2c sourcing report from a state government source.
  • Regulations — verify current state and local regulations before fishing

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