"You see this traffic is worse in the morning and look at it now," said North Shore Neighborhood Board Chair Michael Lyons.
A total of 23,000 drivers cross Karsten Thot Bridge every day, but weather, salt and rust have been eating away at it.
Earlier this summer, crews first assessed the damage, and then cleaned up rust and paint underneath.
"Now, we really know we've got to get in there and fix some rivets and strengthen the bridge somewhat to make it safe for the community," said Department of Transportation Spokesperson Caroline Sluyter.
So starting Monday, the bridge on Kamehameha Highway between Wahiawa and Whitmore Village will shut down for a month and a half.
The problem is everybody we talked to said they didn't have a clue -- not even the people who should know.
"When people say what's going on with the bridge? I've got nothing to say," said Wahiawa Neighborhood Board Member Bob Lormand.
"So, it's a huge impact, but the problem is nobody told anybody what's happening and the community needs to prepare," said Lyons.
Lormand said the bridge itself and the traffic mess going along with it isn't the only problem.
Heavy rains are eating away at the hillside creating problems with landslides. They tried to do some temporary fixes, but another heavy rain could bring it down again.