Bridge & Infrastructure Scanning in San Leandro, CA

San Leandro's structures are defined by what has to pass under them. The Davis Street and Marina Boulevard overcrossings of Interstate 880 were both reconstructed in the southbound HOV project completed in 2016, each raised roughly eight feet specifically to achieve standard vertical clearance over the freeway lanes, with the adjacent structures over the Union Pacific Railroad and San Leandro Creek widened at the same time. Interstate 580 crosses San Leandro Creek on a 1964 structure at the upper edge of the city, and I-880 crosses the Estudillo Canal, part of the Alameda County flood-control system draining the southern half of town. Between them run the Union Pacific freight corridor, the BART line through the downtown and Bay Fair stations, and the arterial bridges that get all of them across each other.

Sub-standard clearance was the reason two of those overcrossings were rebuilt, and it is the reason clearance is the most-requested product we deliver here. A scan measures the soffit as a continuous surface, so the controlling low point is located across the full lane width, at the edge of the traveled way where trucks actually run, rather than at a centerline shot that flatters the structure. The same dataset produces structural as-builts of deck, girders, bent caps, columns, bearings, joints, abutments, and wingwalls for retrofit or widening design, and rail and channel geometry under the span without anyone entering the corridor.

Every scan is registered into a control network observed on published NGS and CSRC stations, on NAD83 State Plane and NAVD88, least-squares adjusted with independent checks reported alongside the data. Because the Hayward fault trace runs through this part of Alameda County and creeps continuously, a dated first epoch on a structure near it is genuinely worth having, and the second one turns creep into a measured displacement. See infrastructure scanning, San Leandro 3D scanning, and deformation monitoring.