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Idaho

Blackfoot Reservoir

Tucked into Caribou County, Idaho, Blackfoot Reservoir is a 16,913-acre reservoir where largemouth move with cover, baitfish, and weather.

Surface
16,913acres
Primary species
Largemouth
§ 01Today on the water · Blackfoot Reservoirvia Open-Meteo · 13:30 local
Air temp
53.1°F
Barometric
29.95″
→steady 24h(+0.02)
Wind
4mph
from E
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

    Better early

    hi 74° · lo 52°

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

    ── front rolling in · s wind setting up

  2. 2
    sepWed

    Tougher window

    hi 71° · lo 49°

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

    ── strong sw wind · bite likely shrinks

  3. 3
    sepThu

    Tougher window

    hi 75° · lo 47°

    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

§ 04Field notesIdaho

Where it is

Blackfoot Reservoir sits in Caribou County, Idaho, covering about 16,913 acres. Season and conditions decide the productive water; the map is the starting point.

Seasonal pattern

Spring. Blackfoot Reservoir sits high in Caribou County, and its 16,913 acres carry winter deep into spring — the largemouth season starts late, gated by cold water off the Idaho high country.

Summer. The compressed summer is the productive core: fish work cover and edges hard while the warmth lasts, and the season rewards showing up in its narrow prime.

Fall. Cooling is abrupt at elevation; a brief autumn window, then the reservoir slides toward winter early.

Winter. Effectively closed for largemouth — long, frozen, and quiet until a late thaw restarts the year.

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

Largemouth on Blackfoot Reservoir hunt baitfish and panfish along cover; forage and weather drive the day's bite.

Access

Public access points serve Blackfoot Reservoir; verify ramp conditions and lake levels before setting out.

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:00397452). 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