Semitruck Blocks Lanes After Jackknifing on Idaho Highway

Idaho State Police respond to incident on US Highway 26 near Swan Valley

Published on Feb. 19, 2026

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A semitruck has jackknifed on US Highway 26 near Swan Valley, Idaho, blocking multiple lanes. The incident occurred around 1:30 PM on Tuesday, shortly after the road reopened following a winter weather closure. Idaho State Police are on the scene, and are urging drivers to avoid the area due to slick conditions and high winds.

Why it matters

Jackknifed semitrucks can pose a significant hazard on highways, blocking traffic and creating dangerous conditions for other drivers. This incident highlights the challenges of winter driving in Idaho, where sudden changes in weather can quickly make roads treacherous.

The details

According to an Idaho State Police Facebook post, the semitruck jackknifed on US-26 near milepost 364 in Bonneville County. The highway is still open, but the semitruck is blocking multiple lanes. ISP says slick conditions and high winds are prevalent in the area.

  • The crash occurred around 1:30 PM on Tuesday, February 17, 2026.
  • The road had reopened just a couple hours prior to the incident following a winter weather closure.

The players

Idaho State Police

The state law enforcement agency responding to the jackknifed semitruck incident on US Highway 26.

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The takeaway

This incident serves as a reminder for drivers in Idaho to exercise caution and be prepared for rapidly changing winter weather conditions, which can make highways treacherous even after they have been reopened.