The San Diego County Board of Supervisors approved the project in 2009.
The facility is slated to have 1,216 beds and published reports put the costs at $221 million. The 45 acre facility is near the heart of Santee, California.
The old facility, situated south of the newer one, was built in the late 1960's and originally planned as a juvenile girl's detention center. Las Colinas currently houses over-18 female inmates.
The expansion of the Detention Center had met with opposition from the local community with petitions signed and circulated before it was approved.
Most agree newer facilities were desperately needed to replace the over-crowded older facility.
Previously published stories on the older facility highlighted the stark conditions female prisoners tolerated.
Visit the San Diego County Sheriff's Department website for further updates at: www.sdsheriff.net.