Contour Survey

Bridge & Infrastructure Scanning in San Rafael, CA

We provide control-tied laser scanning of bridges and transportation structures in San Rafael, Marin County, delivering clearance surveys, structural as-builts, and deformation baselines for highway, local, and rail crossings.

Bridge & Infrastructure Scanning in San Rafael: Local Conditions

San Rafael holds the densest concentration of major structures in Marin. The Richmond-San Rafael Bridge, a 5.5-mile double-decked cantilever and truss crossing on Interstate 580 opened in 1956, lands at Point San Quentin on the city's eastern edge and feeds directly into the US-101 and I-580 interchange, where the Transportation Authority of Marin has been developing a direct northbound 101 to eastbound 580 connector through the Bellam Boulevard corridor. Caltrans replaced the northbound US-101 Central San Rafael structure over the harbor a few years ago. Grand Avenue carries traffic over San Rafael Creek, with a separate bicycle and pedestrian Canal crossing in study and preliminary design. SMART's Larkspur extension added a bridge over the creek along with a rebuilt trestle and a replaced one.

Structures of that variety share one requirement: the survey has to be defensible before the geometry means anything. We establish and observe a control network on NGS and CSRC published stations, work in NAD83 State Plane and NAVD88, adjust by least squares, and verify against monuments held out of the solution. Scans register to that network. From the registered cloud we compute vertical and horizontal clearance across the full lane or track width rather than at sampled points, and produce structural as-builts of decks, soffits, girders, trusses, bents, abutments, bearings, and joints for retrofit, rehabilitation, widening, or load rating.

Because so much of this ground is bay margin and fill, a documented baseline epoch is worth having before a problem appears. Repeat scans on the same control report settlement and movement as difference surfaces and sections. Local bridges advancing through the federal Highway Bridge Program and Caltrans Local Assistance need the same checkable control record. Deliverables are registered E57 or RCP point clouds, DWG/DXF plans, sections, and clearance exhibits, and BIM-ready models; filings arising from control work go through the Marin County Surveyor. See infrastructure scanning, 3D scanning in San Rafael, and deformation monitoring.

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

1

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.

2

Control Survey

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

3

Scanning

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

4

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 San Rafael: FAQ

Yes, from land, from the deck, and from adjacent shoreline setups, with everything above the waterline captured and tied to control. Anything submerged is outside a terrestrial scanner's range, so we deliver the visible structure on real coordinates and leave the underwater portion to a diver or sonar survey that can be merged into the same system.
Through the operating agency, before the field visit. Track access windows, flagging, and roadway worker protection are arranged first, and we plan setups so the productive time inside the window is spent scanning rather than moving. Registering to control set outside the right of way means the data still ties together even when the window is short.
That is one of its best uses. The retrofit engineer needs the structure as it has actually deformed and been modified: real member locations, bearing seat dimensions, joint openings, added plates and retrofits, and column geometry. A registered cloud provides all of that as measured fact rather than as an idealized drawing from the original construction.

Bridge & Infrastructure Scanning Across the East Bay

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Need Bridge & Infrastructure Scanning in San Rafael?

Call (510) 543-2220 or request a quote — we'll scope your San Rafael project and give you a fixed price.

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