The North Spring Street Viaduct (1927, 682’) The North Spring Street Viaduct was built to relieve traffic congestion on the Buena Vista Viaduct and was designed to complete a sub-group (including The Buena Vista Viaduct and Main Street Bridge) of bridges unified through their classical theme. The Spring Street Viaduct is perhaps the most imminently endangered of all the historic bridges over the river as Los Angeles The Bureau of Engineering is currently fast-tracking a proposal which would eliminate the bridge’s Historic-Cultural Monument status and potentially demolish the bridge in order to add a bicycle lane and widen sidewalks. Passage of the BOE’s proposal would be a tragic precedent to set for the remainder of the river’s bridges.