TRANSPORTATION

Illinois Street Intermodal Bridge
Location: San Francisco, California

The Illinois Street Intermodal Bridge is a Design/Build of a new 520-foot long railroad, freight and truck bridge with 85-feet base span located over Island Creek on Illinois Streetp constructed for the Port of San Francisco. The project included a new city street, signalized intersections, freight railroad spur, and a multi-modal bridge with a movable span. The bridge carries vehicular traffic, freight rail, pedestrians and bicyclists across Islais Creek. Creegan + D’Angelo teamed with Shimmick Construction to form the Design/Build Team and was responsible for leading the design. Our innovative engineering solution for the movable span and fixed span construction helped win the project with a bid price $11 million less than all other bidders. Our design team management and cooperation with the contractor and owner was integral in delivering a successful project. This project has been recognized for innovative engineering and has won awards from the industry including Structural Engineers Association of California, Consulting Engineers and Land Surveyors of California and ASCE.

The bridge includes continuous composite concrete deck/steel girder fixed spans and a single leaf non-counterweighted bascule span. The substructure consists of cast-in-place reinforced concrete bent caps and supported on 48 inch diameter steel piles filled with ductile reinforced concrete. The bascule span is trunnion supported and rotates via pulling forces from two 20” diameter, 250 ton capacity hydraulic cylinders. Eliminating usual counterweights eliminated seismic mass and resulted in significant construction cost savings.

Click here to see the construction sequence animation.

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Hamilton Avenue Overcrossing
Location: Campbell, California

The existing Hamilton Avenue bridge carries five lanes of traffic on two 74-ft. continuous-span reinforced concrete box girders. The bridge width of 76.5 ft. includes sidewalks and 57-ft. traffic lanes. CALTRANS designed this bridge as part of the Highway 17 development in 1958. The abutments are closed concrete with a reinforced concrete slab and beam system spanning 35.5 ft. from the at-grade roadway to the bridge seat located at the shoulder of Highway 17.

C+D designed a structural widening of this bridge to accommodate increased traffic volumes on Hamilton Avenue. This addition was designed to the 1985 California Department of Transportation Design Specifications. This includes the latest CALTRANS seismic design criteria and P13 special military truck loading. During preliminary design, several alternatives investigated included AASHTO girders and box girders.

Since Highway 17 traffic and clearance must be maintained, precast girders and cast-in-place slab was the scheme we recommended at the CALTRANS General Plan Review and Structure Type Selection Meeting. The scheme was approved by CALTRANS. Final design includes details for precast girder, details for continuity at central pier and a continuity slab joint at the longitudinal joining of the new-to-existing slab. We prepared the Special Provisions for this construction, which are part of the Specifications and General Conditions of the contract documents. Special attention in this design construction included removing existing rails and walks, traffic control on Hamilton Avenue, closure of Highway 17 during girder erection., and maintaining bridge clearance.

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Ignacio Boulevard / Highway 101 Overcrossing
Location: Novato, California

This project consists of widening an existing bridge over Highway 101 in Marin County and to underpin abutment with soil nailing tie-back system to allow for new freeway on ramp. Off site mitigation to allow for new Hamilton Base Conversion Project.


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Pleasants Valley Road Bridge
Location: Solano County, California

The existing bridge was a structurally deficient four-span concrete bridge, with slender pier columns, evidence of pier cap modification, and channel flows were eroding the banks supporting the foundations. The bridge replacement included a revised road alignment to improve safety, a temporary detour and bridge to allow for demolition and bridge replacement construction on the same road centerline. Creek bank armor improved the channel. C+D Engineers engineered and specified construction of a new single-span cast in place post-tensioned concrete box girder on the horizontal curve.

The new road alignment includes a 420m radius curve that extends onto the bridge in order to meet the County’s 80 kph (50 mph) minimum design speed. Steel girder and concrete girder bridges were considered. The prestressed concrete box girder bridge was the recommended solution, it matches replacement Bridge No. 23C-008 that was just completed and this Caltrans bridge section is very common, so the County received competitive bids from contractors. It required temporary shoring and false work in the creek.

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237 Grade Separation, Highway 85
Location: San Jose, California

The two existing bridges were 308 feet long, six span, cast-in-place Tee beam structures separated by approximately 32 feet. An intermediate hinge was located on each structure. The median widening was accomplished by constructing a closure between the two structures which would accommodate two additional traffic lanes.

Engineering services for these bridges included preliminary Bridge Design Report; seismic evaluation of existing structure; preparation of contract plans, specifications and cost estimates; preparation of Traffic Handling Plan, and independent design check.

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Wawona Covered Bridge
Location: Yosemite National Park, California

C+D Consulting Engineers is Yosemite National Park's selected "on-call" structural engineer since 2000. One of our projects included the rehabilitation of the historic 1858 Wawona Covered Bridge over the South Fork of the Merced River.

C+D provided structural engineering and material testing for the rehabilitation construction and National Historic Landmark registration of this historic hand-built bridge.

We prepared Rehabilitation Construction Plans and specifications that repaired and strengthened the deficiencies identified by C+D Engineers' Inspection, Testing and Construction Assessment Study. Work included using historically replicated large timbers to replace rotted floor framing and strengthen bridge for wind and seismic loads.

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Third Street Bridge
Location: San Francisco, California

The City and County of San Francisco required a condition assessment and a seismic performance analysis of the Islais Creek Bascule Bridge on Third Street. The bridge includes steel double-leaf bascule spans which are lifted by a rack and pinion gear machine. The pinion gear is driven by electric motors. The machine and trunnion bearing are protected in the concrete box type abutments and machine enclosure that are supported on concrete piles. The soil under the abutment includes soft bay mud layer with the piles bearing on a sand layer some depth below the ground surface.

The C+D Team performed a condition inspection of the structural, mechanical, and electrical facilities and systems and also performed a seismic performance review and validation of the bridge. Existing computer model and analysis from recent bridge modifications were used to determine if seismic retrofit is required to meet the life safety and collapse prevention performance goal after a maximum credible earthquake.

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Fourth Street Bridge
Location: San Francisco, California

Creegan + D’Angelo Engineers initially provided Bridge Condition Assessment and Operation Observations. C+D determined that the bridge has deficient clearance at the leaf pier seat that impacts operations. In the future, we will modify the bridge deck framing details at the bridge seat joint to provide proper clearance. We will perform stability and equilibrium calculations to specify installation of balancing counterweights, to correct the span balance defects that impact lift operations.

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High Street Bridge and Park Street Bridge
Location: Alameda County, California

Creegan + D’Angelo Engineers completed a Project Study Report in the evaluation of:

1) the existing vehicle barrier safety system for the Park Street Bridge;
2) the existing center lock system for the High Street Bridge;
3) the metal bridge deck surface of the Park Street Bridge; and,
4) the metal bridge deck surface of the High Street Bridge.

After completion of the PSR, the C+D team was selected for Phase II which developed the preferred rehabilitation/repair/replacement construction. Work scope included preparation of schematic design drawings, construction documents for the two bridges, support during the bidding and construction phase support that includes inspections, equipment commissioning and testing and managing construction progress meetings.

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Riverside Drive Bridge
Location: Sonoma, California

Bridge replacement project - the new structure is a new single span, steel girder bridge, with a wider section, on approximately the same alignment. The existing bridge is 33 feet wide and 181 feet long. The new bridge will be 57 feet wide and 174 feet long. The length will be a combination of bridge span and abutment approach road. The new bridge also has 5-foot wide bicycle lanes/shoulders and 5-foot wide sidewalks on each side.

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Quito Road Bridge Replacement at San Tomas Aquino Creek
Saratoga, California

Replacement of two 70-year old structures with associated channel stabilization and utility relocations.

Traffic was maintained on Quito Road for all but one week at each location to allow demolition of the existing bridge and placement of precast deck members for the replacement structure.

Engineering services included preparation of Hydraulic Report; coordination with Department of Fish and Game, Corps of Engineers and Regional Water Quality Control Board; investigation of alternative design solutions; preparation of final plans, specifications and estimate, and processing through CalTrans.

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Blossom Hill Road - Monterey Highway Grade Separation
Location: San Jose, California

Six-lane bridge over Monterey Highway and the Southern Pacific Railroad's right-of-way with an access ramp structure over the Southern Pacific's right-of-way. The 350 foot long main structure consists of a reinforced concrete box girder supported by reinforced concrete bents on prestressed piling. The 800 foot long ramp structure features the same construction as the main structure.

Engineering Services included preliminary Engineer's Report and complete contract documents including: bridge structures, approach fills, grading and drainage, lighting and signs, utility relocation, landscaping, and detour plans. Also provided assistance to city during bidding and award, and construction consultation.

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San Francisco Bayhead Trail Pedestrian and Bike Bridge
Location: San Leandro, California

The City of San Leandro in conjunction with East Bay Regional Park District proposes to construct a new pedestrian and bicycle bridge over the San Leandro Slough. The slough is approximately 300 feet wide at the bridge location.

C+D Consulting Engineers reviewed available data and made a site visit, considered alternate bridge types and construction methods and equipment. The recommended bridge solution, that minimized environmental impacts and is a cost effective solution is a prefabricated steel through truss bridge that includes:

  • Three span painted tubular steel with concrete deck
  • Two large diameter steel shell pile piers in the water
  • Prefabricated steel bridge sections lifted onto piers
  • Construction is from temporary flexible floats accessed from the banks
  • Delivery of piles and bridge sections is on water

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Laurel Creek Pedestrian Bridge
Location: San Mateo, California

New 60' span bridge over Laurel Creek using new foundation and abutment and steel truss pedestrian bridge.

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SSF/SB WQPC Pedestrian Bridge
Location: S. San Francisco, California

Structural/Bridge engineers for a new 200-foot span pedestrian bridge over Colma Creek in South San Francisco. Saltwater and tidal correlation affects this bridge situated only 800 yards from the San Francisco Bay. Deep pile foundations, epoxy coated reinforcing and silica fume concrete are specified for durability and corrosion protection.

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Bay West Cove Pedestrian Bridge
Location: S. San Francisco, California

This new 220-foot long prefabricated pedestrian bridge is constructed over the San Francisco Bay. It required special corrosion resistant concrete and steel design. The bridge includes pile bents with CIP bent cap. The bridge has two 90-foot spans and a central observation platform.

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Central County Bikeway Pedestrian Bridge
Location: Suisun City, California

A 200-foot long pedestrian and bicycle bridge over McCoy Creek.

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Hartnell Gulch Pedestrian Walkway
Location: Monterey, California

The Hartnell Gulch Pedestrian Walkway is a new 160 foot timber pedestrian bridge supported by cast in drilled hole (CIDH) concrete piers. The bridge links Hartnell Street to the west with a shopping complex to the east and spans over a natural area called Hartnell Gulch.

Creegan + D’Angelo worked closely with the City of Monterey to address the numerous limitations imposed on this project by its location and the surrounding community. A timber bridge was selected to maintain the natural ambiance within the Gulch; however the use of timber as the primary structural element reduced the allowable span between supports. In total, 13 CIDH concrete piers spaced 6’- 23’ apart were used to support the walkway. Due to its proximity to a natural stream and coast live oak trees, alignment was key to reduce impact on both the stream and trees.

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Sir Francis Drake Boulevard Bridge
Location: San Anselmo, California

Structural engineering for pedestrian bridge and railiing replacement over Corte Madera Creek. Project involves removal of existing walkway and guardrail; placement of temporary K-rail barriers; and new walkway/pedestrian bridge supported by new foundation and abutment seat at each end. Providing bridge alternative study, cost estimates, details of selected bridge for Construction Plans and Specifications.

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Happy Isles Pedestrian Bridge
Location: Yosemite National Park, California

Creegan + D’Angelo Engineers provided seven (7) different bridge concepts and two public presentations of alternatives – aesthetics, performance, and costs – to select the 90 feet span timber decked bridge, with historic log railing and posts for the preferred alternative.

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