← Lake Guide44.36° N · 104.84° W

Wyoming

Keyhole Reservoir

Keyhole Reservoir is a Wyoming reservoir of about 8,862 acres in Crook County; conservative largemouth patterns key on cover and the season.

Surface
8,862acres
Primary species
Largemouth
§ 01Today on the water · Keyhole Reservoirvia Open-Meteo · 17:30 local
Air temp
73.6°F
Barometric
29.85″
↓falling 24h(-0.07)
Wind
14mph
from SSE
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

    Watch the wind

    hi 82° · lo 55°

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

    ── stiff se wind

  2. 2
    sepWed

    Tougher window

    hi 90° · lo 55°

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

    ── strong s wind · bite likely shrinks

  3. 3
    sepThu

    Watch the wind

    hi 91° · lo 59°

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

    ── stiff sw wind

§ 04Field notesWyoming

Where it is

Keyhole Reservoir sits in Crook County, Wyoming, covering about 8,862 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 Keyhole Reservoir; the lake holds multiple species and largemouth follow the bait when conditions favor them.

Access

Access to Keyhole Reservoir is generally public; check water levels and conditions 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:01590341). 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