SPOKANE, Wash -

Several crashes have slowed traffic on I-90 through Spokane and the Spokane Valley after a brief snow storm dropped about an inch of snow and reduced visibilities on area roads.

Troopers with the Washington State Patrol responded to a number of collisions on I-90 as a mid-morning snow storm hit Spokane on Sunday.

A head-on collision involving a semi-truck closed down the westbound lanes of I-90 at the Argonne exit. Several other crashes were reported at the Sprague, Fancher, Broadway, Pines and Evergreen exits.

Another crash had stopped traffic in the westbound lanes between the Pines and Argonne exits.

Department of Transportation cameras showed disabled vehicles scattered across the interstate Sunday morning.

In addition to several minor fender-benders, several rollover accidents were also reported.

As of 11:47 a.m., the Washington State Patrol had investigated all of Sunday morning's collisions on I-90 in Spokane County and had reopened all lanes.

Slick roads weren't just confined to the interstate.

Spokane Police responded to several wrecks in north Spokane and drivers on Trent reported a number of crashes near the Pines intersection where conditions were described as a "sheet of ice".

City officials in Spokane Valley said plow crews would be deicing and applying sand to problem areas and arterial intersections Sunday into Monday.

The National Weather Service reported locally heavy snow showers for Spokane, Kootenai, Whitman and Lincoln counties. Up to a half-inch of snow and visibilities down to a half-mile were expected.

Forecasters and law enforcement officials warned drivers in eastern Washington and north Idaho to prepare for slick driving conditions Sunday morning and afternoon.