It clearly states California in the Article. Read it:
What was initially reported to the California Highway Patrol as a fire at around 3:42 a.m. Sunday quickly escalated to an explosion and roadway collapse on roadway that connects eastbound Interstate Highway 80 to eastbound Interstate Highway 580, according to a California Highway Patrol dispatcher.
This is in the first paragraph. California highway patrol, resonding to CA accident(I would assume)on Highways 80 and 580 in the BAY AREA. Only one bay area in CA. Even if you don't know that, you know that the accident happened in CA and you know the highways involved. I cannot immagine how you would think it happened anywhere BUT Calfornia given the explicit nature of the reporting on this fact. I mean are any of the bays you mentioned located in CA? I think not but I could be wrong.
And in each of those areas, the local news would call it the Bay Bridge and not tell you what city and state it is in. NBC11 is a local TV station. It was not written as a national news story. Someone just happened to find it on the local news and post it for the world to see.
Yesterday they imploded the Fulton Road Bridge where I live. The local paper and news did not have to tell me it was in Cleveland, Ohio.