Colorado mountain highways have been pummeled by avalanches this week during what avalanche forecasters are calling a historic cycle of slides.

Parts of Interstate 70 have periodically closed, the Arapahoe Basin ski area was unable to spin its lifts and U.S. 550 over Red Mountain Pass has been blocked by snow and debris since Monday.

Here’s a round-up of what’s open and what’s not:

Interstate 70, Denver to Grand Junction: Open. Passenger vehicles required to have snow or mud tires, use chains/traction devices or be a 4WD or AWD vehicle between Vail and Copper Mountain. Between Vail and Georgetown, risk of snow slides and “powder clouds possible,” the Colorado Department of Transportation wrote.

The interstate shut down at Vail Pass and at Copper for avalanches Thursday, as well as over the Eisenhower Tunnel Tuesday.

U.S. 6, Loveland Pass: Closed. Loveland Pass closed Thursday morning, also forcing A-Basin to leave its lifts to rest Thursday and Friday morning. The ski resort will send a status update 9 a.m. Friday.

U.S. 50, Monarch Pass: Open. Passenger traction law in effect. The pass closed Thursday night for avalanche blasting.

Colorado 91: Open. Passenger traction law in effect.

Colorado 82, westbound at La Plate Trailhead mile marker 71.3: Closed for safety concerns.

U.S. 550: Red Mountain Pass will remain closed through the weekend. It initially closed Monday after avalanches dumped 30+ feet of snow, trees, branches and other debris on the highway.

These conditions are obviously subject to change. For the most up-to-date information, visit the Colorado DOT Twitter page.

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