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Diamond Springs Parkway Phase 1A State Route 49 Realignment

Ghirardelli was selected by the County of El Dorado to provide construction management services for Diamond Springs Parkway Phase 1A  State-Route 49 Realignment project in Diamond Springs. Diamond Springs Parkway is a future four-lane divided roadway connecting Missouri Flat Road to State Route 49 (SR-49).  The primary purpose of this project is to improve traffic safety and operations on portions of SR-49 in the vicinity of Diamond Springs.  The new road will provide parallel connection from SR-49 to US-50 that will relieve traffic congestion through the historic town of Diamond Springs.  The project will also improve safety on Diamond Road/SR-49 by reducing residential driveway access with the provision of a new frontage road.

SR-49 / Diamond Road will be realigned to the west to create a frontage road for residences along the east. The realigned road will be improved with two (2) 12-foot and 8-foot shoulders. Other project improvements include:

  • Roadway excavation
  • HMA paving
  • Concrete curb, gutter, sidewalk
  • Signing and striping
  • Caltrans Type 1 retaining wall with architectural treatment
  • Masonry block sound wall
  • Permanent and temporary fence removal and construction
  • New El Dorado Irrigation District water main
  • Utility modification including AT&T, PG&E, and Comcast
  • Drainage improvements (underdrains, culverts, ditches)
  • Sewer improvements
  • Signal and lighting improvements

Client: County of El Dorado
Location: Diamond Springs, CA