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Costa Mesa, CA 92626

 

STREET WIDENINGS & INTERSECTION IMPROVEMENTS

 

Mesa Drive/Irvine Avenue Intersection Improvements

Newport Beach, CA 

Client: City of Newport Beach

 

Mesa Drive/Irvine Avenue Intersection    Mesa Drive/Irvine Avenue Intersection

 

Civil Works Engineers was hired by the City of Newport Beach to prepare preliminary and final engineering for improvements to the Mesa Drive/Irvine Avenue intersection. The purpose of the improvements was to convert the inside westbound through lane to a second left turn lane from westbound Mesa Drive to southbound Irvine Avenue. Since Mesa Drive east of Irvine Avenue is a five-lane cross section (City of Newport Beach) and west of Irvine Avenue is a two-lane cross section (unincorporated County), the lane conversion resulted in a significant intersection lane alignment offset. The project involved restriping Mesa Drive east of Irvine Avenue and widening, through right-of-way acquisition, west of Irvine Avenue.

The County concurrently designed a widening of Irvine Avenue from University Drive to Bristol Street. Their widening varies from 10 to 25 feet on alternating sides of the street and additionally includes 
pavement reconstruction and pavement overlay. The City's intent was to fund the intersection improvements and include their construction within the County's Irvine Avenue construction document set.

The project involved:
   street widening
   right-of-way engineering and acquisition
   retaining walls
   hydrology study and report
   storm drain pipe and inlets reconstruction
   signing and striping
   signal modification
   geotechnical investigation and report
   coordination with County for inclusion of construction documents  
      into their bid set

Mesa Drive, west of Irvine Avenue, is on approximately a 12 percent decline as it approaches the intersection. Long catch basins were existing at the base of this slope at the curb returns. One of the 
challenges the County presented was to improve the catch basin interception such that no runoff would bypass these basins, during a storm magnitude of 10-year event or less, and enter the intersection. The solution to improving the intersection drainage was to extend the storm drain system further up Mesa Drive, to the west, near Riverside Avenue and add additional catch basins.

 

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