Flood in Idaho, January 27 to 29, 2026

Name: Flood in Idaho, January 27 to 29, 2026
Start: 2026-01-27T00:00
End: 2026-01-29T18:23
Location: Idaho

January 27 to 29, 2026 · NWS MSO · 1 event in 1 county or zone

Cold temperatures resulted in a gradually build up of ice and water backing up on the Lemhi River between Tendoy and Lemhi.

Where it happened

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Cold
Fire, smoke and dust
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The toll

Deaths: 0
Injuries: 0
Property damage: None recorded
Crop damage: None recorded
Events: 1

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

What happened

The episode as NWS MSO wrote it up.

Cold temperatures resulted in a gradually build up of ice and water backing up on the Lemhi River between Tendoy and Lemhi.

The radar

The national radar mosaic for the moment the first event began.

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Event by event

1 flood. Local standard time, as filed.

Flood, Lemhi

When: January 27, 12:00 AM MST to January 29, 6:23 PM MST
Where: Lemhi County, 2.3 mi SSW of Tendoy to 2.05 mi SSW of Tendoy
Cause: Ice Jam
Reported by: Public
Coordinates: 44.940, -113.639

The Lemhi River exceeded action stage on the 27th and reached minor flood stage on the 28th. This caused yard flooding south of Tendoy, between Mabee Lane and McDevitt Creek Road, though no homes were impacted. The river crested at 7.07 feet at 2:00 PM MST on the 29th at the Lemhi River near Lemhi gauge, then receded that evening as ice broke up.

What these are

Flood: Flooding that develops more slowly than a flash flood: rivers leaving their banks, or water standing over land for an extended time.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

Every storm in Idaho in 2026 Every state in 2026 This day in weather history Warnings in Idaho, January 2026

Sources

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 1306552.