The massive amounts of snow in the Sierra have once again shut down two main routes in and out of the Tahoe Basin. And the road closures mean traffic headaches for spring breakers who might be trying to reach the area Monday.

KPIX/CBS SF reports via El Dorado County Sheriff's Department that an avalanche dumped snow and rocks onto the roadway of Highway 50 around 12:30 p.m. Monday, briefly trapping one vehicle that had to be dug out. The road remains closed this afternoon as the snow and debris are cleared.

Meanwhile one of the main roads around Lake Tahoe, Highway 89, has been partially shut down today due to an avalanche. Caltrans reports that a section of the road is closed between Bliss State Park near Emerald Bay and five miles north of the junction with Highway 50 in South Lake Tahoe.

I-80 remains open without chain controls, though some snow fell early Monday, and more snow is expected into Monday evening.

No injuries have been reported in connection with these avalanches.