The reasons for the crash are still under investigation.
UPDATE - 4:26PM - All roads are back open, according to Mono County Sheriff's Office.
UPDATE - 11:06AM - CHP says the fire in the truck was burning for three hours before crews could get it out and it is currently still smoldering.
The driver still has not been identified.
CHP says the truck crashed on top of a bridge overpass and flipped over into the east portion of the Walker River. Two tow trucks are trying to remove it now.
The highway will be shut down for several more hours, according to CHP.
BRIDGEPORT, Cal. (MyNews4.com & KRNV) - A deadly big rig crash on US-395 near Bridgeport, California is under investigation.
According to a news release from California Highway Patrol, as of 6:20 a.m. Tuesday morning, fire crews were still working on extinguishing the fire. A portion of US-395 will remain closed until Cal-Trans determines the bridge is safe for traffic.
Officials say a semi-tractor towing a semi-trailer, driven by an unknown person, was traveling northbound on US-395 when for unknown reasons the tractor/trailer combination struck and traveled through a bridge railing, landing on an embankment of the East Walker River where it became fully engulfed in flames.
Vehicles southbound on US-395 from Nevada will be detoured by NDOT at Holbrook Junction,Nevada 208, to Nevada 338, to California State Route 182, and back to US-395 at the south edge of Bridgeport.
We will keep you updated as new information is released.