A-N West Inc.

25 YEARS

Civil+Structural Consulting Engineers

ROADWAYS AND BRIDGES

Our engineers combine experience-based knowledge with state-of-the-art computing tools. For transportation-related concrete and steel structures, we provide complete 3-dimensional computer modeling, structural analysis and design services.

Route 85/Guadalupe River Bridges - San José, CA

These parallel 1,620-foot ten span bridges cross the Guadalupe River, local streets, Light Rail Transit tracks, and Santa Clara Valley Water District percolation ponds.
	A-N West prepared bridge advanced planning studies, conducted seismic analysis, foundation analysis, conducted field surveys and geotechnical investigations, prepared a bridge hydraulic report, and prepared structures PS&E for the four-lane, continuous cast-in-place prestressed concrete box girder bridges on State Route 85 crossing the Guadalupe River. A 231-foot arch span was incorporated into the design of each bridge's main span over the Guadalupe River. A-N West coordinated with Caltrans District 4 and Division of Structures, and the VTA.

23rd Street Grade Separation - Richmond, CA

A-N West prepared complete PS&E for a complex grade separation project to carry 23rd Street, a north-south arterial, under UPRR main line tracks, a BART aerial structure, and adjacent Carlson Boulevard.
	The UPRR underpass consists of two single-span CIP/PS box girders at a 40 degree skew. The underpass carries three tracks. The project eliminated a complicated 6-point vehicular intersection crossing the main line tracks. The Carlson Blvd overcrossing is a 153-foot long, single-span, CIP/PS box girder at 40 degree skew, on seismic isolation bearings, and carries three traffic lanes. Bridge aesthetics were developed to be in harmony with an existing BART structure. Other features include a stormwater pump station, traffic signals, street lighting, landscaping, double track railroad shoofly, utility relocations (including petroleum pipelines), and bridge removal.

North First Street Light Rail Transit Underpass - San José, CA


	This 1,100-foot long double track underpass was designed as part of the Guadalupe Light Rail Transit project in downtown San Jose. The project included bridge structures for Bassett Street and the UPRR main line tracks. The entire length of the underpass is between a pair of retaining walls featuring multi-tiered planters and ceramic tile bands. Construction period services included review of contractor's designs and shoring plans for the underpass and stormwater pump station. A-N West received the 1989 Grand Award from the Northern California Concrete Association.

I-80/Richmond Parkway Interchange and Freeway Widening - Richmond, CA

A-N West prepared roadway and structures PS&E for a complete new interchange and freeway widening of Interstate 80 between Hilltop Drive and Appian Way Interchanges in Richmond and Pinole, CA.
	The overcrossing is a seven-lane, three-span continuous cast-in-place prestressed concrete box girder with mid-overcrossing on/off ramp structure carrying HOV traffic lanes. The I-80 widening provides an eight-lane freeway, including two HOV lanes and HOV enforcement lanes. A Park and Ride Lot, ramp metering provisions, lighting, signing, striping, and signals were included in the project, as well as landscaping along non-interchange portions. A-N West coordinated with Caltrans District 4 and Division of Structures for this City of Richmond Department of Public Works project.

Pedestrian and Bicycle Bridge at the Childrens Museum - San José, CA


	This cable-stayed pedestrian and bicycle bridge was designed for the Redevelopment Agency of the City of San Jose. The 120-foot long bridge provides pedestrian access from the San Jose Convention Center across the Guadalupe River to the Children's Discovery Museum. The signature bridge was envisioned to be a functional structure that could enhance the experience associated with the Children's Discovery Museum. The 55-foot high A-shape pylon is located on the east bank and is fabricated from 12-inch steel pipe. The cable forestays (helical steel wire structural strand) connect the pylon to a 24-inch diameter cross-tube under the superstructure. The project involved topographic surveying of the site, an hydraulic analysis of the Guadalupe River to verify clearance of the 100-year flood water surface, structural analysis and design, and civil engineering design of the bridge approaches. A-N West was lead firm for the project and prepared contract plans, specifications and construction cost estimates.

Route 85/17 Interchange - San José, CA


	A-N West prepared roadway PS&E for mainline and ramp segments of this freeway interchange between Route 17 and Route 85 for the Santa Clara County Traffic Authority. Left turn movements are handled by a pair of direct connector ramps and a pair of loops. The direct connector ramps are between the levels of the two freeways. A storm water pumping station was required for the project because Route 85 is approximately 15 feet below the bed of Los Gatos Creek, the lowest storm water outfall point. The pumping station installed capacity is 350 HP, discharging up to 20,500 gallons per minute.

HBRR Bridges - Cities of Martinez, Orinda, Pinole, San Pablo, Saratoga; and Sonoma County, CA

For several local agencies throughout the Bay Area, A-N West has provided engineering services ranging from funding acquisition and planning studies and environmental clearance through complete project design, roadway and structures PS&E, and construction services. These HBRR projects range from bridge rehabilitation, widening and retrofit to complete bridge replacement, including utility relocation, traffic signal modification, landscaping, and stage construction traffic handling plans.