← Lake Guide43.55° N · 99.01° W

South Dakota

Lake Francis Case

Lake Francis Case is a Missouri River reservoir of about 82,167 acres in Brule County, South Dakota; multi-species water where bass-oriented planning stays conservative.

Surface
82,167acres
Primary species
Largemouth
§ 01Today on the water · Lake Francis Casevia Open-Meteo · 08:30 local
Air temp
73.4°F
Barometric
29.76″
↓falling 24h(-0.07)
Wind
17mph
from SSE
Moon
Waning Crescent
day 26.4 · 10% lit

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

§ 03Next 3 daysvia Open-Meteo · interpretation
  1. 8
    sepTue

    Watch the wind

    hi 84° · lo 67°

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

    ── stiff nw wind

  2. 9
    sepWed

    Watch the wind

    hi 79° · lo 57°

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

    ── stiff nw wind

  3. 10
    sepThu

    Watch the wind

    hi 92° · lo 60°

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

    ── stiff s wind · direction shift overnight

§ 04Field notesSouth Dakota

Where it is

Lake Francis Case sits in Brule County, South Dakota, covering about 82,167 acres. Season and conditions decide the productive water; the map is the starting point.

Seasonal pattern

Spring. Warming water pulls largemouth toward shallow, protected areas where they stage and spawn; the quickest-warming pockets lead.

Summer. Heat pushes fish off the shallows toward depth and shade; work the cooler ends of the day.

Fall. As water cools, forage and bass return toward shallower water; movement is wide, so covering water pays.

Winter. Cold water settles fish deep and slow; patience and a subtle presentation are the more dependable choice.

Key structure

  • Creek and cove mouths that funnel fish and bait
  • Weed edges and the clean lines along them
  • Inside turns where a bank changes angle
  • Submerged wood, brush, and laydown cover

The calendar decides which of these is worth time on a given day.

Forage

Baitfish and panfish drive the forage on Lake Francis Case; the lake holds multiple species and largemouth follow the bait when conditions favor them.

Access

Lake Francis Case has public access points; conditions and water levels change, so verify locally before launching.

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 are from the ProjectD canonical waterbody index (snapshot conus-20260518-v1, group gnis:01255140). Maximum depth and regulation links were not available from an acceptable source and are intentionally omitted.
  • Regulations — verify current state and local regulations before fishing

Last revised · Back to Lake Guide