Ghirardelli Associates

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

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