#Oakland: CHP: Big rig carrying steel beams from old Bay Bridge tips. I-880 on-ramp at 7th St. Load shifted.#mapit pic.twitter.com/zt2QyxJNe8 — Elissa Harrington (@EHarringtonNews) June 10, 2015

OAKLAND, Calif. (KGO) -- A major accident involving a big rig has shut down the 7th Street on-ramp getting onto Southbound 880 in Oakland.The CHP says the overturned big rig was loaded with metal beams from the old Bay Bridge, which is slowly being dismantled.The beams are huge, so the cleanup is going to involve getting a crane to reload the truck.The CHP says this could take hours.The accident happened just after 9 a.m. on Wednesday morning.The CHP says that speed may have been a factor, but they do not think it is rain-related. Nobody was injured.