- All eastbound SR 91 lanes and westbound SR 91 HOV lane and No. 1 lane will close Friday night, (Sept. 12), 11 p.m. through Saturday morning, (Sept. 13), 9 a.m.
- All westbound SR-91 lanes and eastbound SR 91 HOV lane and No. 1 lane will close Saturday night, (Sept. 13), 10 p.m. through Sunday morning, (Sept. 14), 9 a.m.
La Sierra Avenue over the freeway will remain open during construction, although delays are expected. All businesses will remain accessible. Drivers should use alternate routes, such as Pierce, Magnolia or Tyler Streets, during the closures.
The $38 million project will replace the La Sierra Avenue bridges over both the freeway and the railroad tracks with six-lane bridges to reduce traffic congestion. New dual left-turn lanes onto the freeway will make it easier for vehicles to access the Riverside Freeway, while ramps will be widened from two to three lanes.
The project is expected to be completed by the summer of 2009.