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Modjeska Canyon Road Bridge (No. 55C-0172) Replacement Project

Orange County Public Works, in cooperation with the California Department of Transportation (Caltrans), is proposing to replace the Modjeska Bridge (Bridge No. 55C-0172) over Santiago Creek. The Modjeska Bridge is located in Modjeska Canyon near the Cleveland National Forest. The existing bridge is a single span and crosses over Santiago Creek. The Project will replace the existing substandard steel bridge; a portion of the construction funding is provided by the Highway Bridge Program (HBP).   

The proposed replacement structure is a 65’-2” long and 43’-10” wide single-span prestressed, precast concrete I girder bridge. The bridge will be raised approximately one foot to increase hydraulic conveyance. Tall abutment walls, similar to the existing condition, will be set on spread footing foundations. Tall wing walls will be required at all corners. The replacement bridge will have 12-foot-wide lanes and will include 8-foot minimum width shoulders. Bridge barriers will be deck-mounted concrete barrier Type 836.  

The new bridge will be stage constructed to allow one lane of alternating traffic during construction. The alternating one-way traffic will be controlled by a signal.  During the first stage, a temporary bridge approximately 80 feet long will be placed within the footprint of the new bridge. The temporary bridge will contain both directions of travel on one lane, utilizing a temporary traffic signal, while the existing bridge is removed for the second construction stage, one lane of alternating traffic is shifted to the new bridge, the temporary bridge is removed, and the remaining half of the new bridge is constructed. Overall construction is anticipated to take 8 months and is estimated to begin in 2023.


Please submit written comments by March 7, 2022, to the person listed below:

Sam Tieu, PE

OC Public Works // OC Infrastructure - Project Management
601 N. Ross St., Santa Ana, CA 92701-4048
phone (714) 647-3968    email