Bridge & Infrastructure Scanning in Crockett, CA

No community of this size in the Bay Area sits under more structure. Interstate 80 crosses the Carquinez Strait to Crockett on two independent bridges: the Alfred Zampa Memorial Bridge, a suspension span opened in 2003 carrying westbound traffic and a bicycle and pedestrian path, and a steel cantilever truss opened in 1958 carrying eastbound traffic, roughly 3,300 feet long, 52 feet wide, and about 140 feet above the water. Their approach spans, abutments, and the interchange ramps at Pomona Street, San Pablo Avenue, and the Cummings Skyway junction all land on the Crockett side. Below them the shoreline rail corridor runs the length of the strait, and the C&H Sugar plant carries its own waterfront and wharf structures. Behind the town, terraced streets stand on generations of retaining walls that function as structures in every practical sense.

Structures of this scale are exactly what control-tied scanning exists for. We observe a network with GNSS and total station, adjust it by least squares on NAD83 State Plane and NAVD88 with independent check observations, register every Trimble scan position into that network, and report residuals with the data. The scanner reaches geometry that no other method reaches economically here: soffits high above a roadway, truss members out over water, bearings and joints at a pier, and bluff faces below an approach embankment, all measured from safe ground positions at millions of points per setup. That produces structural as-builts of girders, bents, abutments, bearings, and connections, vertical clearance computed across the full lane width from the soffit surface, and repeat epochs differenced against a baseline where deflection, settlement, or slope movement is in question. Field time is short because coverage is a matter of setup geometry, not of how many dimensions a crew can take.

Deliverables are registered E57 or RCP clouds, DWG or DXF plans, sections, and soffit contours, clearance reports, and displacement maps. See infrastructure scanning, Crockett 3D scanning, and deformation monitoring.