Update: Spring Snowstorm Shuts Down State Route 18 near Tiger Mountain

Update, 7:30 p.m.: Several spinouts and near-collisions shut down State Route 18 near Tiger Mountain for several hours Thursday evening, eventually re-opening at 7:15 p.m. after the evening rush hour, according to WSDOT.

Washington State Patrol closed the highway in both directions between Issaquah-Hobart Road and Interstate 90 at around 4 p.m. Thursday evening after a number of motorists and semi trucks near Mirrormont became stuck as the snow fell heavily in the late afternoon. 

As the evening wore on, WSDOT was able to clear and re-open the roadway as the snowstorm moved east — later causing havoc at Denny Creek and then Snoqualmie Pass, which closed in both directions at around 8:30 p.m. Thursday.

WSDOT says it expects to reopen I-90 after 10 p.m.

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Update, 5:50 p.m.: Eastbound State Route 18 is now re-open but westbound lanes remain closed, WSDOT tweeted at around 5:30 p.m.

But snow-related traffic woes in the foothills aren't over yet. The eastbound lanes of I-90 are now closed at Denny Creek after several spin-outs, WSDOT says.

Check back with Patch for more updates.

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Original post: Heavy snow has caused the closure of both directions of SR 18 are closed at Issaquah-Hobart Road due to multiple stalled cars and semis due to heavy snowfall.

A WSDOT camera showed several cars and semi-trucks off in the shoulder of the roadway.

The Washington State Patrol is directing cars off Eastbound SR 18 at Issaquah-Hobart Road. Westbound traffic at is being stopped at the Interstate 90 overpass.