Lewiston Crew Removes Loose Rocks From Thain Grade Cliff

Rainstorm caused rocks to come loose, creating a danger zone for drivers

Mar. 20, 2026 at 3:00am

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The City of Lewiston shut down Thain Grade for less than an hour on Monday to allow crews to safely remove loose rocks that had come down from the cliff face due to recent heavy rains. The danger zone was between Stewart Avenue and the uppermost entrance to Home Depot and the Nez Perce Plaza businesses. Once the rocks were cleared, the road was reopened and crews continued cleaning up the debris.

Why it matters

Thain Grade is an important thoroughfare in Lewiston, and the loose rocks posed a safety hazard for drivers. The city acted quickly to address the issue and ensure the road was safe for travel again.

The details

A press release from the City of Lewiston stated that the rainstorm last week had loosened the rocks on the cliff face, creating the danger zone. The city shut down Thain Grade at around 9am on Monday for less than an hour to allow crews to safely knock down and remove the loose rocks. Once that was completed, police reopened the road and crews continued cleaning up and hauling away the debris.

  • The rainstorm that loosened the rocks occurred last week.
  • The city shut down Thain Grade at around 9am on Monday, March 20, 2026.
  • The road was reopened less than an hour later after the loose rocks were removed.

The players

City of Lewiston

The local government of Lewiston, Idaho that oversees the maintenance and safety of the city's roads and infrastructure.

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The takeaway

The city's quick response to address the safety hazard on Thain Grade demonstrates their commitment to maintaining the integrity of the local transportation network and ensuring the safety of drivers in Lewiston.