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South Dakota

Lake Thompson

Lake Thompson stretches across 13,888 acres in Kingsbury County, South Dakota, with largemouth fishing that reads off cover and current.

Surface
13,888acres
Primary species
Largemouth
§ 01Today on the water · Lake Thompsonvia Open-Meteo · 09:30 local
Air temp
60.2°F
Barometric
29.90″
↑rising 24h(+0.17)
Wind
3mph
from ESE
Moon
Waning Gibbous
day 19.4 · 77% lit

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

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

    Tougher window

    hi 85° · lo 58°

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

    ── strong e wind · bite likely shrinks

  2. 2
    sepWed

    Stable window

    hi 84° · lo 62°

    Anytime through the day. Quiet weather day; lean on seasonal pattern and structure.

    ── light e wind · settled

  3. 3
    sepThu

    Stable window

    hi 102° · lo 67°

    Anytime through the day. Quiet weather day; lean on seasonal pattern and structure.

    ── light se wind · settled

§ 04Field notesSouth Dakota

Where it is

Lake Thompson sits in Kingsbury County, South Dakota, covering about 13,888 acres. Where the largemouth sit changes with the season, not the map.

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

Bass on Lake Thompson key on baitfish and panfish; the productive water moves with the forage through the year.

Access

Launches around Lake Thompson are public; confirm seasonal closures and water levels with local sources first.

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:01258536). 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