Rainfall and Stream Gage Data

Orange County Hydrology Data Portal

Click on the image below for access to current and historic rainfall and stream gage data from hydrologic monitoring stations operated and maintained by OC Public Works, as well as cooperative monitoring stations in neighboring Counties.

      ArcGIS Map with Quick View of Rainfall Totals (1 Hour up to 3 days)

      Click here to access a full screen map.

      Latest Rain Report

      Data from the latest storm event including rainfall and seasonal accumulations for the Santa Ana, Villa Park Dam, Santiago Peak, and Costa Mesa stations in Orange County.

      Rainfall data in SHEF format:


      Accuracy of Information - Use of Information

      Although the data found using the County of Orange, OC Public Works Department access systems have been produced and processed from sources believed to be reliable, no warranty expressed or implied is made regarding accuracy, adequacy, completeness, legality, reliability or usefulness of any information. This disclaimer applies to both isolated and aggregate uses of the information.

      The County of Orange, OC Public Works Department provide this information on an "as is" basis. All warranties of any kind, express or implied, including but not limited the implied warranties of merchantability, fitness for a particular purpose, freedom from contamination by computer viruses and non-infringement of proprietary rights ARE DISCLAIMED.

      Changes may be periodically added to the information herein; these changes may or may not be incorporated in any new version of the publication. If you have obtained information from County of Orange, OC Public Works Department or from a source other than County of Orange, OC Public Works Department, be aware that electronic data can be altered subsequent to original distribution. Data can also quickly become out-of-date. It is recommended that careful attention be paid to the contents of any metadata associated with a file, and that the originator of the data or information be contacted with any questions regarding appropriate use. If you find any errors or omissions, we encourage you to report them to the County of Orange, OC Public Works Department webmaster.