Protecting the Environment
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…
Lower Santa Ana River
Improvements to 23 miles of existing channel from Weir Canyon Road to the Pacific Ocean include channel widening, improvement to the existing Greenville-Banning Channel located parallel to the river…
Flood Programs
Flood Programs is comprised of Floodplain Management, Hydrology and the Santa Ana River Section. Floodplain Management consists of preparing facilities studies; assisting other OCPW…
Building Permit Information
A building permit provides you formal permission to begin construction of a building project in accordance with the approved permit documents (i.e. drawings, calculations, specifications). We…
OM GIS Maps
O&M has GIS maps that depict the County’s maintained roadways and flood control facilities. These maps are used to monitor and manage maintenance activities and projects. …
Dams
Seven Oaks Dam Seven Oaks Dam is one of the largest earth and rock-filled dams in the world. It is as high as a fifty story building and ten football fields in length from side to side. Situated…