SEATTLE - Crashes involving tractor-trailer rigs in heavy snow closed Interstate 90 and U.S. Highway 97 this morning.

Troopers said drivers traveling too fast for the conditions on the downhill slope lost control.

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The state Transportation Department reported the westbound lanes of I-90 closed at 8:25 a.m. Wednesday at Milepost 106 at the west end of Ellensburg, and U.S. 97 was closed at 8 a.m. near Blewett Pass, between Ellensburg and Wenatchee.

Traffic was down to one lane on I-90 from Milepost 83 to Milepost 87 near Cle Elum, and the freeway was closed in both directions at Elk Heights, about 12 miles east of Cle Elum, because of a tractor-trailer rollover. All but one westbound lane were reopened by noon.

A State Patrol dispatcher, C.L. Clarke, says the collisions began mounting after heavy snow had been falling.

Troopers said drivers traveling too fast for the conditions on the downhill slope lost control. The cab one one truck ended up dangling over the edge of an overpass.

No injuries were reported.

U.S. 97 was reopened shortly before 10:30 a.m.