The crews originally finished their repairs at 5:30 a.m. Friday morning, but they made a key mistake, so their work was torn down a couple of hours later.
The scene in Walnut Creek. Working to get the info that goes with this picture.... pic.twitter.com/4bOieQ9zdv— Amy Hollyfield (@amyhollyfield) July 28, 2017
Police say the phone and cable lines were installed too low.
When a delivery truck pulled into the intersection Friday morning, it hit the lines and brought them down again.
Drivers say they were disappointed to have to deal with detours for another day.
This is the main through for a lot of people going over the hill instead of the freeway so it makes a huge difference backing up traffic this way. But if school was in session, it'd be even worse so at least school hasn't started yet," said Craig Hamilton, a Concord resident.
Crews tell ABC7 News that the lines are connected to phone and cable lines, so the power in the area is still on.
Police are not saying when the roadway will reopen.