A major seismic and architectural upgrade has begun. This project provides for the seismic retrofit of the North Main Street Bridge to meet the latest California Department of Transportation (Caltrans) seismic requirements. Construction activities will include replacing portions
of deck in order to access the arch ribs for retrofitting, retrofitting the arch
ribs by providing a thin concrete jacket around the entire arch ribs, and
providing transverse in-fill walls between the shortest spandrel walls that
support the bridge deck. This is a seismic retrofit project only, and will not
include any widening.
The original bridge railings, ornamental lamp posts, sidewalks and crown
hinge keystones will also be restored in accordance with the original As-
Built 1910 design plans as a mitigation measure per the environmental
This project was awarded by the Board of Public Works on December 9,
2009 to T.T. Polich and Associates in the amount of $5,726,248.20.
The Notice to Proceed will be issued on February 8, 2010, however physical construction is not expected to begin until July 2010. The construction duration is approximately 2 years.