Friday, May 2, 2014

On The Road to the 10/605 Flyover: New Design-Build Concept to Reduce Congestion


           Spearheaded by Caltrans and MCM Construction as part of a unique design-build project, the construction of a maximum 58-foot high, single-lane connector bridge over the I-10/I-605 interchange in the San Gabriel Valley is speeding ahead.  The connector will improve motorists’ transition from southbound I-605 Freeway to eastbound I-10. Gains for motorists include improved traffic flow, reduced commuter delays due to merging traffic and the improved movement of goods throughout the region.


    Construction started in earnest fall 2013, with building of retaining walls and ground clearing for the connector. By late fall 2013, a westbound I-10 new connector ramp was completed and 8 columns, each 7 feet in diameter, were erected in preparation for bridge construction. This past winter and spring saw the installation of steel and wood false-work and formwork in preparation for the construction of the cast-in-place concrete bridge.  
       Next Steps 
     Bridge building will continue through the summer and fall of 2014. Currently, new columns and bridge foundations are being constructed at the Frazier off-ramp area along Eastbound I-10; this foundation construction will continue through summer 2014. The relocation of critical utility lines will begin soon just south of I-10 in the City of Baldwin Park to make room for the extension of this south-east connector structure. 
      Interesting Connector Facts: 
  • The Connector is approximately 4,000 feet long, or the length of 5 bridges which are typically 800 feet long each
  • During peak hours, up to 4,000 vehicles per hour use the interchange’s connecting lanes.
  • Electrical transmission towers which had crossed over the I-10 and which provide Southland communities with critical power had to be raised; poles to suspend electrical conductors are now nearly 200 feet high in order to clear the bridge.  
   When finished in fall 2015, the Direct Connector will boast a 30-foot-wide single lane connector with a 5-foot left shoulder and a 10-foot right shoulder.
   The Design-Build concept allows for improved coordination between the Designer/Contractor and Caltrans, setting up better constructability, higher efficiency, and earlier completion.
      For more project information, please visit the 10/605 Facebook page.