OAKLAND -- Westbound traffic on Highway 24 near Broadway was snarled for several hours Tuesday after a speeding dump truck carrying gravel overturned in an six-vehicle wreck that scattered debris across two lanes, authorities said.

The California Highway Patrol received calls around 8:43 a.m. of an overturned semi-truck on westbound Highway 24 just west of Highway 13, said Officer Daniel Hill. When officers arrived, they found a dump truck laying on its right side on the center divide of Highway 24, and its load, asphalt and gravel, was spilled all over the two far left lanes.

One person went to Highland Hospital after the wreck, complaining of pain, and did not have life-threatening injuries, Hill said. None of the other individuals involved in the wreck were injured, Hill said.

California Highway Patrol officers, CalTrans workers and tow truck operators labor to remove an overturned big rig hauler from westbound Highway 24 just
California Highway Patrol officers, CalTrans workers and tow truck operators labor to remove an overturned big rig hauler from westbound Highway 24 just east of the Broadway exit, where it overturned and spilled its load on Nov. 5, 2013, in Oakland. (D. Ross Cameron/Staff)

Witnesses told CHP officers that the driver of the gravel truck was traveling at a fast rate of speed and hit with six other cars as he came down the grade on the west side of the Caldecott Tunnel, Hill said. The CHP will inspect the truck to determine whether mechanical or equipment defects contributed to the crash, Hill said.

Cleanup crews needed more than four hours to clean up the debris, and big rig tow trucks were brought in to bring the truck right-side up and clear it from the scene, Hill said.

Traffic was backed up to St. Stephens Drive in Orinda immediately following the wreck and had slowed back to the Central Lafayette exit by midday, according to the CHP and commuters. The Central Lafayette exit is about eight miles from the tunnel.

Anyone with information on the incident can contact the CHP Oakland Area Office at 510-450-3821, or the CHP's nonemergency public access number at 1-800-TELL-CHP (1-800-835-5247).

Staff writer Katie Nelson contributed to this report. Contact Harry Harris at 510-208-6443 and follow him at Twitter.com/HarryHarris15. Contact Rick Hurd at 925-945-4789 and follow him at Twitter.com/3rdERH.