Contour Survey

Bridge & Infrastructure Scanning in Santa Rosa, CA

We provide control-tied laser scanning of bridges, overcrossings, and flood-control structures in Santa Rosa, Sonoma County, delivering clearance surveys, structural as-builts, and repeatable monitoring baselines on published control.

Bridge & Infrastructure Scanning in Santa Rosa: Local Conditions

Santa Rosa is cut north to south by US-101 and east to west by State Route 12, and the crossings between them make up most of the city's structure inventory. The 101 corridor carries a long list of overcrossings and interchanges, among them Hearn Avenue, which has been studied for a rebuilt multimodal interchange, Mendocino Avenue, Steele Lane, and College Avenue, and the mainline bridge over Santa Rosa Creek that was demolished and rebuilt as part of the HOV widening between the Route 12 interchange and Steele Lane. Route 12 itself was built as a freeway from Sebastopol east to US-101 and on to Farmers Lane. A bicycle and pedestrian bridge over 101 between Edwards and Elliott Avenues is under contract. SMART runs through the middle of the city with its downtown platform in Railroad Square, and Santa Rosa Creek crosses the whole city in an engineered channel with bridges, walls, and culverts along it.

All of that is control-network work before it is scanning work. We establish and observe a network on NGS and CSRC published stations, work in NAD83 State Plane and NAVD88, adjust by least squares, and check against monuments withheld from the adjustment. Registered to it, a scan yields clearance across the full travelled way instead of at sampled points, and structural as-builts of decks, soffits, girders, bents, columns, abutments, bearings, and joints for seismic retrofit, rehabilitation, widening, or load rating. On the creek channel it yields wall faces, invert and soffit relationships, and cross sections a hydraulic model can consume.

Baselines matter for the same reason they matter anywhere with alluvium and flow: change is only measurable against a first observation. City bridges advancing through the federal Highway Bridge Program and Caltrans Local Assistance need documented, checkable control behind their existing-conditions data. Deliverables are E57 or RCP point clouds, DWG/DXF plans, sections, and clearance exhibits, and BIM-ready models; filings go through the Sonoma County Surveyor. See infrastructure scanning, 3D scanning in Santa Rosa, and deformation monitoring.

Full service details, process, and deliverables: Bridge & Infrastructure Scanning · All surveying in Santa Rosa: Santa Rosa 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 Santa Rosa: FAQ

In most cases yes. The soffit and the travelled way beneath are scanned from shoulder and median setups, and where a lane is genuinely required the closure is planned as a short window with the traffic control agreed in advance. The result is a clearance surface across the full width rather than a handful of measured points.
Structure geometry and channel geometry together, on one control network: deck and soffit surfaces, bent and abutment dimensions, wingwalls and channel walls, invert and low-chord elevations on NAVD88, and cross sections at any station. Structural and hydraulic reviewers then work from the same file instead of reconciling two surveys.
As the existing-conditions base the design is built on. Real pavement surfaces and cross slopes, ramp geometry, structure clearances, barrier and retaining wall locations, and the visible utilities all come from one registered dataset. Later, a post-construction scan against the same control documents what was actually built.

Bridge & Infrastructure Scanning Across the East Bay

PittsburgBrentwoodSan RafaelMill ValleyNovatoSausalitoPetalumaNapaSan FranciscoOaklandBerkeleyAlamedaEmeryvillePiedmontAlbanyEl CerritoRichmondKensingtonSan PabloEl SobrantePinoleHerculesRodeoCrockettOrindaMoragaWalnut CreekLafayetteMartinezConcordPleasant HillBeniciaVallejoSan LeandroAntioch

Need Bridge & Infrastructure Scanning in Santa Rosa?

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

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