Bridge & Infrastructure Scanning in Martinez, CA

Contour Survey delivers control-tied bridge and structure scanning in Martinez, the Contra Costa County seat, covering strait crossings, rail structures, and the downtown creek bridges with clearance surveys, structural as-builts, and monitoring epochs.

Bridge & Infrastructure Scanning in Martinez: Local Conditions

Martinez sits at one of the most structurally dense points on the Carquinez Strait. Interstate 680 crosses on two separate bridges: the 1962 truss span, named the George Miller Jr. Memorial Bridge, with seven 528-foot spans and roughly 138 feet of vertical clearance, now carrying southbound traffic plus a bicycle and pedestrian path; and the 1.7-mile precast segmental concrete span opened in 2007, carrying northbound lanes. Immediately alongside runs the Union Pacific vertical-lift railroad bridge, built between 1928 and 1930, whose lift span has about 291 feet of horizontal clearance and roughly 70 feet of vertical clearance closed against 135 feet raised, and which carries Union Pacific, BNSF, and Amtrak traffic. Inland, the city has a different inventory entirely: the crossings of Alhambra Creek through the downtown grid, the creek's railroad bridge near the Amtrak station, and the pedestrian structures along the creek and the regional shoreline.

Structures at this scale are the argument for scanning rather than taping. A movable span, a truss, and a segmental box girder have nothing in common except that every element that matters is high, over water, and unreachable. Scanning records all of it from safe positions on the deck, the approaches, the shoreline, and a vessel where necessary: chords and gussets, bearings, joints, bent caps, pier shafts, and the soffit profile that clearance is computed from. For navigational and permit-load questions, that soffit surface is the deliverable, measured across the full opening instead of at a single reported dimension.

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. A dated first epoch on a pier, an abutment, or a wingwall becomes the reference a later scan is differenced against, which is how settlement and scour move from opinion to measurement. See infrastructure scanning, Martinez 3D scanning, and deformation monitoring.

Full service details, process, and deliverables: Bridge & Infrastructure Scanning · All surveying in Martinez: Martinez land surveying

What's Included

Control-network-tied scans with a stated, defensible accuracy
Vertical and horizontal clearance surveys from the point cloud
Structural as-builts of decks, soffits, bents, abutments, and bearings
Deformation baselines and repeat epochs for movement analysis
Rail, roadway, and utility corridor capture with minimal closures
Tanks, tunnels, and plant piping documented without contact
Deliverables in your agency CAD standard, NAD83/CSRC and NAVD88
Licensed surveyor responsible for control, datum, and certification

Our Process

Control & Access Plan

We design the control network, datum ties, scan positions, and traffic or rail access plan around the structure and its closure windows.

Control Survey

GNSS and total-station control is observed with redundancy and adjusted by least squares, producing published coordinates and error estimates.

Scanning

Trimble terrestrial laser scanning from the control, with targets and check shots, captures the structure at high density in short field windows.

Registration & Deliverables

Scans are registered to control, verified against checks, and processed into clearance reports, CAD, models, and comparison surfaces with an accuracy statement.

Bridge & Infrastructure Scanning in Martinez: FAQ

Yes, and the geometry is worth capturing in more than one position. Scanning the lift span both seated and raised documents the machinery towers, counterweights, guides, and the actual clearance envelope in each state, which record drawings rarely reflect after decades of repair. All access on an active rail structure is arranged through the operating railroad before any fieldwork.

Positions are planned so the structure is covered from shore, from the approaches, and from the deck, with vessel-based setups added when the underside cannot be seen from land. Every setup is registered into the same control network, so the far pier is on the same coordinates as the abutment. Wind, tide, and traffic windows are all planned around before mobilizing rather than discovered on site.

It fixes the geometry on a known date against a published datum, so any future question about movement has something rigorous to compare against. On shoreline and creek structures where scour, settlement, and fill consolidation are ongoing, a baseline captured before a rehabilitation project frequently turns out to be the most useful record the owner has. We report the datum, the network, and the achieved accuracy so a later crew can reoccupy it.

Bridge & Infrastructure Scanning Across the East Bay

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