Bridge & Infrastructure Scanning in Brentwood, CA

Brentwood's structures are young by Bay Area standards and that changes what owners need from a survey. The State Route 4 Bypass, built in three segments by the joint powers authority formed with Contra Costa County and Antioch and open along its full length since 2009, carries the arterial crossings and grade separations at the west edge of town. Marsh Creek runs through the city in an engineered flood-control channel with street bridges over it, including the Central Boulevard and Dainty Avenue crossings, and the county maintains its own bridges on Marsh Creek Road east of town. The Sand Creek Road extension added a full-width four-lane bridge over Sand Creek. Almost none of these have measured as-built geometry that matches what was actually built.

Scanning fixes that in one visit. We establish and observe a control network on NGS and CSRC published stations, work in NAD83 State Plane and NAVD88, and adjust by least squares with independent checks, then register every scan to it. What comes back is a bridge you can measure anywhere: deck surfaces and cross slopes, soffit and girder geometry, bent and abutment dimensions, wingwalls, barrier rail, joint openings, and clearances computed across the full travelled way rather than sampled. For box culverts and creek crossings we deliver inverts, soffits, barrel dimensions, headwalls, and channel cross sections that a hydraulic model can actually consume.

Because the ground here is young alluvium and the channels move sediment, a first epoch is worth capturing before anything is wrong. Repeat scans registered to the same control quantify scour at the abutments, settlement of approach slabs, and channel change as difference surfaces rather than anecdotes. City-owned bridges funded through the federal Highway Bridge Program and Caltrans Local Assistance need exactly that kind of documented, checkable control. Deliverables are E57 or RCP point clouds, DWG/DXF plans and sections, clearance exhibits, and BIM-ready models. See infrastructure scanning, 3D scanning in Brentwood, and Brentwood topographic surveys.