BRIDGES

FORESTHILL BRIDGE SEISMIC RETROFIT PLACER COUNTY, CA

Quincy Engineering was the prime firm responsible for the preliminary development of the Foresthill Road Bridge Seismic Retrofit Project. The fourth tallest bridge in the U.S., it sits 730 feet above the North Fork of the American River and is 2,428 feet long. Quincy was responsible for the seismic evaluation of the existing bridge, development of the seismic strategy and implementation of the seismic strategy and rehabilitation in terms of the development of the Plans, Specifications and Estimates. In addition, Quincy provided construction design support, which included all the review of the structural steel drawings, temporary supports and temporary construction sequence submittals. This project received the 2014 Outstanding Bridge Project Award from the ASCE Sacramento Chapter.

LEGACY PARKWAY 

SALT LAKE CITY, UT

Quincy designed the Pedestrian Bridge P-21 for the Legacy Parkway Project outside of Salt Lake City, Utah. The Legacy Parkway Project was a very large urban corridor project which required extensive context sensitive solutions (CSS). The environmental requirements of the project required that aesthetics play a major role in any design solutions. The final design of the pedestrian bridge was an eight-span, cast-in-place prestressed concrete box girder that formed an S-shaped structure rising up and over the mainline legacy parkway. The bridge is supported by large decorative pierwalls which complement the horizontally curved superstructure elements.

NILES BOULEVARD BRIDGE REPLACEMENT

FREMONT, CA

The original bridge in Fremont was constructed in 1970 to span over the new BART tracks as well as a UPRR track. This project began as a seismic retrofit with Caltrans’ Local Agency Seismic Retrofit Program with Quincy staff completing the design and independent check of a $1M retrofit in 1999. About 5 years later, Caltrans agreed to fund a replacement bridge. Originally Quincy was hired to design the bridge, with the new roadway to be designed by the City. Eventually the City of Fremont asked Quincy to design the roadway as well. After several years of delayed reviews and approval, the construction was just completed earlier this year. This project is a testament to Quincy Engineering’s perseverance, as it took 19 years to finally complete the project! The project received the 2018 APWA Northern California Chapter Public Works Project Award for Transportation Projects between $5M-$25M.

COUNTY ROAD 85 BRIDGE

MODOC COUNTY, CA

Quincy provided complete project management, surveys, environmental, permits, hydraulics, and roadway/bridge PS&E design services on this major bridge replacement. The project involved the replacement of a single-lane, 70-foot timber truss bridge and three timber beam approach spans founded on pier walls embedded into bedrock. The replacement is a two-span, cast-in-place reinforced concrete box girder bridge with seat abutments on spread footings with a single-column bent founded on a mined shaft on an adjacent alignment. The horizontal and vertical alignment greatly improved the roadway geometry and allowed the original structure to remain open during construction, which was necessary as the detour around the site would have been 50 miles.

MORGAN TERRITORY ROAD EMERGENCY SLIDE REPAIR 

CONTRA COSTA COUNTY, CA

Quincy Engineering, with Contra Costa County and Hultgren-Tillis Geotechnical Engineers, developed the emergency slide repair project. Extensive storms in 2016-2017 resulted in saturated soils that resulted in a large slide on a 200-foot segment of Morgan Territory Road. The slide extended about 100 feet uphill from the road and 200 feet downhill of the road to Marsh Creek. This slide resulted in road closure and created severe hardship for the 1,000 cars per day that use the road to access their residences, business and agricultural land. Within 22 calendar days from the start of the project, Quincy Engineering developed the design, check, and 95% PS&E documents. The repair consisted installing a tie back soldier pile wall on the uphill side of the road, installing a stitch pile wall on the downhill side of the road, and excavating and recompacting slide material under the roadway in between the walls.

SCHULTIES ROAD STORM DAMAGE REPAIR 

SANTA CRUZ COUNTY, CA

Quincy provided design plans, specifications, and estimates for a geogrid reinforced earth soil slope and wire basket facing units to repair a storm damage slip-out on the inside of a horizontal curve on Schulties Road. The purpose of the design was to prevent roadway scarping and erosion due to the failure of an existing culvert along the natural drainage flow-line.

CHALLENGES & SOLUTIONS

Every challenge you face, whether it's funding, gaining public acceptance of a project, or finding the right alignment of a bridge to prevent further damage to a stream, has often been faced by others. Here are some key challenges we've seen and ways we've helped clients solve them.

LOCATION

Determining the bridge profile and alignment are key to each project's success. Issues like hydraulics, seismic activity, and the environment have significant impacts which we bring to the forefront during the design process.

FUNDING

In the last 5 years, we've prepared federal and state funding applications for over 50 bridges for numerous agencies. Those agencies received $160M+ for bridge repair or replacement projects. Our team also has intimate knowledge of FEMA coordination and emergency storm damage repair, and can walk you through the process

SEISMIC DESIGN

We've designed and retrofitted numerous bridges to withstand seismic activity. Our highly experienced bridge earthquake engineers are familiar with the latest seismic design criteria and identify design recommendations for a given site response and liquefaction mitigation measures.