Prado Dam is an existing facility constructed by the Corps of Engineers in 1941. The plan of improvement for the Prado Dam and reservoir, which has an estimated cost of $880 million includes…

Search by Location To verify if a particular address falls within an OC Road Fee Program, please visit the Geographic Information System (GIS) web map application atlightbulb ocgis.…

FEMA Flood Insurance Rate Maps (FIRM)Flood Insurance Rate Maps (FIRM), a.k.a. Flood Maps, can be viewed through the Federal Emergency Management Agency's (FEMA) Map Service Center. If you have the…

Year Adopted: 1981 Year Closed: 2020 Supervisorial Districts: 3 & 5  Cities covered by Plano Trabuco Road Fee Program: Rancho Santa Margarita Program Description…

Geotechnical Design Report Revised Aerially Deposited Lead Report Material Report Aerial Deposited Lead Report

The Santa Ana River and its shoreline are home to numerous threatened or endangered species, including the Santa Ana sucker, the least Bell's vireo, the southwestern willow flycatcher, and the…

1. What is the OC Loop?The Orange County (OC) Loop is a vision for 66 miles of seamless connections and an opportunity for people to bike, walk, and connect to some of California’s most scenic…

Forms & Training for Medi-Cal CertificationsRevision DateMedi-Cal Application - County Programs09/2014Medi-Cal Application - Contracted Programs05/27/2025Medi-Cal Recertification Training (County…

FIRM Instructions To get access to the FEMA Flood Insurance Rate Maps (FIRM), click here.  To find a flood map for a specific address or landmark, you may type an address in…

In this section you will find informational resources including online maps, reports, manuals, and links to County Standard Plans and other government resources. Reference Materials (in PDF format)…