FREEWAYS & INTERCHANGES
Quincy staff has significant experience from designing new interchanges to reconstructing and making operational improvements to existing ones. Our civil engineers develop innovative solutions to meet a project's needs, while working within the project constraints, such as designing for construction staging and reducing traffic impacts. Many of our senior engineers are former Department of Transportation designers who thoroughly understand the process and requirements for designing and delivering publicly funded transportation projects.
Interchange Design Configurations
Single Point I/C
Compact Diamond I/C
Spread Diamond I/C
Full Diamond I/C
Split Diamond I/C
Diverging Diamond I/C
Our project delivery services include: Project Scoping, Design Approval Documents, Feasibility Studies, Project Funding, Public Outreach, Utility Coordination, Right-of-Way Footprint, Design-Build, and Alternative Delivery Methods.
STATE ROUTE 4/BALFOUR ROAD INTERCHANGE
CONTRA COSTA TRANSPORTATION AUTHORITY
Quincy Engineering developed the Project Study Report/Project Report and PS&E package for the construction of a grade-separated interchange at State Route 4 and Balfour Road in the City of Brentwood. This interchange replaced an at-grade intersection and included the construction of bridges, utility relocation, drainage facilities, and traffic signals. Quincy also led the effort in coordinating with Caltrans, Contra Costa Transportation Authority, City of Brentwood, the local regional water quality control board, and various utility agencies.
U.S. 50 HOV LANES
EL DORADO COUNTY
Quincy provided preliminary engineering for the development of the supplemental environmental clearance documents, geometric approval drawings, and final design services for phased improvements within a 3-mile segment of U.S. 50. This included rehabilitation of the existing pavement, HOV and auxiliary lane improvements, reconstruction of four existing structures, preliminary design of a new pedestrian overcrossing, construction of retaining structures, drainage improvements, reconstruction of the El Dorado Hills interchange, signals, lighting and improvements to the existing El Dorado Hills Boulevard. This 3-mile segment included coordinating the geometrics of three interchanges. This project received the 2012 ASCE Sacramento Transportation Large Project of the Year Award.
I-5 GREEN SPRINGS HIGHWAY INTERCHANGE
Quincy prepared preliminary and final design for this $8 million project to widen and repair the Green Springs Highway (OR66) Interchange bridge over I-5 in Ashland. Project improvements included roadway widening to provide additional turning lanes, adding sidewalks for connected pedestrian access, providing bicycle lanes and an experimental bicycle signal, overhead lighting, storm water treatment, drainage, irrigation, landscaping, and public involvement. Quincy performed project management and roadway, bridge, signing, striping, storm water design, and traffic control design. Because the interchange was classified as the "Gateway to Oregon" aesthetic treatments were included. This project was awarded a 2013 ACEC Engineering Excellence Honorable Mention as well as a 2011 City of Ashland Architectural Preservation Award.
ELK GROVE, CA
Quincy completed the Project Study Report – Project Development Support for a new interchange on State Route 99 at Whitelock Parkway in the City of Elk Grove. This project will also provide auxiliary lanes along State Route 99 as well as improve system linkage, increase capacity, accommodate transportation demand, foster economic development, and provide additional transit and bicycle facilities. One alternative being considered is a diverging diamond configuration.
CHALLENGES & SOLUTIONS
The path to designing a new road or replacing one isn't always a straight shot. Here are some of the biggest challenges we've seen over the years and ways we've helped clients solve them.
Our team has fostered strong relationships with the various State Department of Transportation districts because we understand the value and need for close coordination on small and large projects. This allows us to work hand-in-hand with Caltrans/ODOT to ensure a smooth project from start to finish.
Nothing can stop a project faster than environmental impacts and permitting. Identifying potential issues and working to ensure mitigation efforts are implemented at the project onset are mission critical.
It's critical to keep traffic control and construction staging at the forefront during design. Significant traffic impacts to commuters can be avoided just by adjusting the alignment or location of the new/replacement off- and on-ramps.
US50/El Dorado Hills Interchange Phase 2B
Matthew Smeltzer, PE - Deputy Director-Design Division, County of El Dorado Department of Transportation
THIS PROJECT TEAM COMPLETED AN INTERCHANGE PROJECT IN A RECORD 5 MONTH PERIOD. THIS IS USUALLY A ONE TO TWO YEAR PROCESS. QUINCY ENGINEERING’S STAFF AND SUBCONSULTANTS WORKED AROUND THE CLOCK SEVEN DAYS A WEEK AND DEMONSTRATED TOP-QUALITY SKILLS AND KNOWLEDGE THAT GOT THE DESIGN DONE AND THROUGH THE CALTRANS APPROVAL PROCESS IN RECORD TIME."