Icy road continues will continue to make driving difficult throughout the day, warns the Washington state Department of Transportation.

Several state highways are closed, including State Route 900, the Sunset Highway, at May Valley Road just east of Renton.

State 410 is closed between SR 164 and the Federated Forest, which means that skiers at Crystal Mountain Ski Resort will not be able to leave for a few hours.

Tree limbs loaded with snow are snapping and falling onto state highways all across King, Snohomish and Pierce counties. Many roads are closed due to downed trees. It appears it will get worse before it gets better.

“We haven’t seen trees come down like this in years,” said Chris Johnson, maintenance manager for the Washington State Department of Transportation, who’s been with the agency for 28 years.

“We had our crews out all night de-icing the roads. We threw everything we had at this storm – sand, de-icer, salt and plows. It’s so widespread that it’s been very difficult to keep up,” said Dave McCormick, regional maintenance manager for WSDOT.

The National Weather Service extended the ice watch until 2 p.m. today.

Region-wide power outages are affecting the systems that power the WSDOT Seattle area traffic flow map and cameras.

As of 11 a.m., here is a list of the major state road closures:

• SR 18 closed between SR 164 and I-90 due to multiple downed trees for several miles.

• SR 202 closed between Fall City and Snoqualmie due to downed trees. This will remain closed for several hours.

• SR 410 closed between SR 164 and the Federated Forest. Skiers at Crystal Mountain Ski Resort will not be able to leave for a few hours.

• SR 900 closed at May Valley Road.

• SR 165 closed at 288th Street in Carbonado due to downed powerlines and trees.

• SR 507 near Eastgate due to downed trees.

• SR 167 in Puyallup near 8th Street

Earlier this morning, a WSDOT Incident Response Team member was injured while responding to a collision on southbound I-405 near the I-5 interchange. The worker remains at Harborview Medical Center with broken bones.

“We are concerned about the safety of our workers and drivers,” said McCormick. “We don’t want anyone to get hurt.”

Drivers are encouraged to check the forecast and check conditions before they head out. Drivers should consider waiting a several hours before driving and putting off discretionary trips.

“We need drivers’ help. The more prepared you are, the better it is for everyone,” said McCormick.