The next Wilshire Bl/I-405 ramp with an extended closure will be the northbound on-ramp from eastbound Wilshire Bl. We anticipate that the ramp closure will begin in August 2013. The northbound I-405 on-ramp from eastbound Wilshire Bl is scheduled to be closed for 90 days.
The latest ramp to be demolished and reconfigured was the southbound off-ramp to westbound Wilshire Bl. The ramp closure opened nearly one week ahead of schedule on the morning of March 16, 2013. Two key ramps linking the northbound I-405 and Wilshire Bl opened to drivers August 31, 2012, three weeks earlier than scheduled. The westbound Wilshire on-ramp to the northbound I-405 and the northbound I-405 off-ramp to westbound Wilshire have reopened significantly earlier than the 90-day reconstruction time anticipated when workers began demolishing the ramps on June 22, 2012.
Reconstruction of all eight Wilshire ramps is expected to take more than one year. These closures are expected to create significant temporary impacts to Wilshire Bl and adjoining streets, such as Federal Av, Sepulveda Bl and Veteran Av. Sunset Bl and Santa Monica are recommended alternatives.
Workers prepare the new northbound on-ramp from eastbound Wilshire Bl bridge for a deck pour. The deck will be several inches taller than the top of the rebar workers are assembling.
Looking northeast, this photo captures another stretch of the new northbound on-ramp. The plastic bags before the rebar cages hold small stone blocks used to separate layers of rebar during a deck pour.
This photograph looks north at an abutment of the flyover ramp for eastbound Wilshire to northbound I-405.
Soon this structure will be covered in false work, the wood framing that will allow the pouring of the deck. The completed ramp will have a much larger capacity for storing cars than the existing ramp.
Overhead and south of Wilshire, this false work will form part of the bridge deck.
Building the new ramps will reduce the conflict between Wilshire Bl and the I-405 as it crosses Wilshire Bl. In turn, this should reduce backup at other north/south streets, such as Westwood Bl and Veteran Bl.
In addition to addressing problems afflicting one of California’s busiest interchanges, reconstruction of the Wilshire ramps will upgrade them to the latest seismic standards.
The current off-ramp/on-ramp configuration presents a dangerous situation at these of these regionally important intersections:
- Westbound Wilshire Bl on-ramp to the southbound I-405
- Southbound I-405 off-ramp to eastbound Wilshire Bl
- Northbound I-405 off-ramp to westbound Wilshire Bl
- Eastbound Wilshire Bl on-ramp to northbound I-405
At these locations, a mass of drivers struggle to reach a through-freeway lane or change lanes to reach the off-ramp exit. These maneuvers must occur within a short distance and feature the same chaos: the on-ramp traffic slows to merge on while off-ramp traffic speeds up to merge off.
The reconstruction of the Wilshire Bl ramps and their connections with the I-405 freeway require a complex construction schedule to minimize the traffic effects at these heavily traveled interchanges. Although the reconstructed interchanges will produce some of the I-405 project's greatest traffic improvements, the multiple ramp closures will affect traffic flow for miles.
Last Revised: Friday August 02, 2013