 And California's tallest bridge to undergo structural testing. This is from Fox 40 News. California's tallest bridge, the Forest Hill Bridge in Placer County, will be undergoing non-destructive testing after an Ohio bridge of similar construction was shown to have issues in its steel, according to Placer County officials. According to the county, ultrasonic testing will be done on 282 weld points called butt welds, as the steel used in these areas, T1, recently showed some issues in an Ohio bridge.