Interstate 80 was closed in both directions over the Sierra Nevada near Donner Lake on Sunday night.
The westbound lanes were shut down by a 60-foot mudslide near the Donner Lake Road interchange, Caltrans reported. Traffic was being held back at the town of Truckee with no detour and no estimated time when the highway would reopen as of 8 p.m.
The slide occurred near Donner Lake Road shortly after 6 p.m., the California Highway Patrol reported.
“Use an alternate route,” the CHP’s Truckee office said on Facebook. “The clean up of this is expected to take hours.”
The eastbound lanes of I-80 were closed by more than 80 power poles that were leaning toward the highway with power lines dipping to within a few feet of the ground. Eastbound traffic was stopped at the city of Colfax in Placer County, said Deanna Shoopman, a spokeswoman for the state Department of Transportation.
The leaning poles may have been the result of high winds and sodden ground, she said.
For about two hours, Caltrans said, the westbound lanes of Highway 50 near Kyburz were closed by a mudslide that happened around 6 p.m.. Crews were trying to remove a 6-foot boulder in the roadway.
Shoopman said the lanes were reopened around 8 p.m. but the highway was being closely watched. Flood waters from the South Fork of the American River were expected to inundate the area, and if that happened, the highway would be closed again, she said.
Caltrans also said the Capital City Freeway in West Sacramento near Harbor Boulevard was experiencing some flooding from clogged drains. The Garden Highway under Interstate 5 was also flooding, though the interstate was not affected, Shoopman said. (Editor’s note: A previous version of this story incorrectly reported that Interstate 5 near the Garden Highway was flooding.)