A big-rig hauling trailers filled with corn and a Chevy Avalanche tangled on Highway 99 Wednesday morning, causing a major load spill and shutting down two lanes of the freeway for hours.

The crash was reported at 9:58 a.m. between the Service Road overpass and the Mitchell Road exit. The crash was occurred when the Chevy blew a tire and struck a semi going in the same direction. The big-rig jackknifed, spilling the load of grain. Caltrans was called in with sweepers to clean-up the spill, which clogged traffic until after 1:40 p.m.