Caltrans and state and local leaders gathered near Cal Expo Wednesday morning to cut the ribbon on a $288 million rehabilitation of the American River Bridge, closing out a years-long fix to a span that had been quietly crumbling under some of the heaviest traffic in the Sacramento region. The bridge carries State Route 51, known locally as the Capital City Freeway or Business 80, across the American River between downtown Sacramento and communities to the east.
The project rehabilitated the bridge deck and reinforced its piers, addressing problems that had been building for decades, according to KCRA. The structure dates back to 1954, when it was built as two separate two-lane spans, and was widened to six lanes in 1966 using lightweight concrete that avoided the need for new in-river piers, according to the Sacramento Water Contractors Public Agency. Deck cracking and deterioration later prompted a full overhaul.
By the time Caltrans engineers took a close look, the damage was extensive. Assessments found deck cracking, concrete spalling, high chloride corrosion, and riverbed erosion severe enough to expose the bridge’s steel foundation piles beneath its footings, per a presentation posted by River Park Sacramento. The presentation said deterioration could lead to emergency repairs.
A Freeway That Couldn’t Afford to Shut Down
SR-51 carries heavy commuter traffic, making the rehab a balancing act: repair the bridge without shutting down one of Sacramento’s busy commuter arteries…