Wind River Canyon

The sheriff's office expressed condolences to the unnamed boy's family.

Flooding has also caused damage and displaced families in communities such as Sheridan.

Officials say at this time of year coming into spring, the cycle of freezing and thawing causes rocks to move downhill.

WYDOT officials said previously that they wanted the rock down before winter.

Drivers can expect 15-minute delays through Friday as workers prepare for blasting followed by cleanup.

They had just stopped for one slide, when they caught the second.

The highway was reopened early Wednesday morning.

Motorists are advised to avoid stopping in the canyon.