Bridge & Infrastructure Scanning in Vallejo, CA

Vallejo is bracketed by major crossings. At the southern edge, Interstate 80 spans the Carquinez Strait between Crockett and Vallejo on two structures: a cantilever bridge opened in 1958 carrying eastbound traffic, and the Alfred Zampa Memorial Bridge, the suspension span opened in 2003 that carries westbound traffic plus a bicycle and pedestrian path and was the first suspension bridge built in the United States in more than three decades. To the west, State Route 37 reaches the city over the Napa River on the high Mare Island Bridge, built tall enough for ships to pass beneath. Between downtown and the island sits the Mare Island Causeway, a city-owned vertical-lift span about 165 feet long and 48.5 feet wide, first built in 1934, offering close to 100 feet of clearance fully raised and carrying vehicles, pedestrians, and rail. Interstate 780 runs east toward Benicia, and the waterfront adds ferry terminal structures, piers, and wharves on filled ground.

A movable municipal bridge, a suspension span, and a high river crossing have one thing in common: the elements that govern their condition are above, below, or over water. Scanning reaches them without touching them. From safe setups on the deck, the approaches, the shoreline, and a vessel, we record towers, girders, bearings, joints, machinery frames, pile caps, and fender systems, then compute clearance as a surface across the whole opening instead of quoting one dimension, in the seated and raised positions where a span moves.

Control is observed first on published NGS and CSRC stations, referenced to NAD83 State Plane and NAVD88, adjusted by least squares with independent checks stated on the deliverable. Along the Vallejo shoreline, where fill continues to consolidate, a dated baseline scan is the reference that later epochs are differenced against to quantify settlement. City-owned structures typically reach design through the federal Highway Bridge Program run by Caltrans Local Assistance. See infrastructure scanning, Vallejo 3D scanning, and deformation monitoring.