California Department of Transportation

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Last Updated: Thursday, January 5, 2012 11:59 AM

Historic Bridge Inventory

The historic bridge inventory categorizes state and locally-owned bridges relative to the National Register of Historic Places significance criteria.

The inventory was completed in 1986 and is currently being updated. Until the update is completed there many bridges in the inventory must be re-evaluated. In most cases these are Category 5 bridges (determined not eligible for listing in the National Register of Historic Places) because they were not 50 years old and did not possess exceptional significance at the time of evaluation. Because more than a decade has passed since the original inventory such bridges are now 50 years old and may have gained historical significance.