Contour Survey

Bridge & Infrastructure Scanning in El Sobrante, CA

We scan the water and roadway structures of El Sobrante, unincorporated Contra Costa County, from San Pablo Dam Road culverts and retaining walls to embankment, spillway, and outlet geometry, all tied to an observed control network.

Bridge & Infrastructure Scanning in El Sobrante: Local Conditions

The structure inventory around El Sobrante is defined by one road and one reservoir. San Pablo Dam Road is a Contra Costa County arterial running roughly twelve miles from San Pablo Avenue in the city of San Pablo to Moraga Way in Orinda, following San Pablo Canyon and the reservoir shoreline along the former California and Nevada Railroad right-of-way, and crossing under Interstate 80 at one end and meeting State Route 24 at the other. Along that alignment sit creek crossings, cross culverts, headwalls, and a long run of retaining walls on ground that moves. Above the community, San Pablo Dam is a 170-foot-high, 1,200-foot-long earthfill embankment impounding about 38,600 acre-feet for the East Bay Municipal Utility District; a seismic upgrade completed in 2010 replaced its downstream buttress with a much larger one founded on ground improved by cement deep soil mixing. Water agency engineers, county public works staff, and the consultants working for both are the people who need survey-grade geometry here.

For structures of that class we scan control-tied and say so on the drawing. Monuments are set and observed with GNSS and total station, the network is adjusted by least squares on NAD83 State Plane and NAVD88 with independent checks, every Trimble scan position registers into it, and residuals are reported. Out of the cloud come embankment crest and slope surfaces, spillway and outlet channel geometry, wall face and batter profiles, culvert barrel and headwall dimensions where access allows, and true bare-earth ground beneath brush. Because the instrument measures at range without contact, geometry on a steep embankment face or a wall above a creek is captured from safe positions instead of by rope access, and a repeat epoch differenced against the baseline shows settlement or bulging across the entire surface.

Deliverables are registered E57 or RCP clouds, DWG or DXF sections and profiles, volume and surface reports, and displacement maps. See infrastructure scanning, El Sobrante 3D scanning, and deformation monitoring.

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

That is one of its main advantages. The scanner measures at range from stable ground, so a steep embankment, a spillway wall, or a slope above a creek is recorded without anyone standing on it. We plan setup geometry so surfaces hidden from one position are covered from another, and the registered result is a continuous surface rather than a set of reachable spots.
A self-referencing scan tells you shape; a control-tied scan tells you position. We set and observe monuments, adjust the network by least squares with independent check observations, and register each scan into it, then report the residuals. That is what lets a later epoch be compared to this one honestly, and what lets a designer place new work against your data with confidence.
We work from the shoulder, the ditch, and the inlet and outlet ends rather than standing in the lane, and each position takes minutes. Where a barrel interior is needed and confined-space or flow conditions allow it, we scan from the ends and inside as far as safety permits, and we coordinate with the agency traffic control already scheduled rather than requesting a separate closure.

Bridge & Infrastructure Scanning Across the East Bay

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Need Bridge & Infrastructure Scanning in El Sobrante?

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

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