Runoff Data

Public Works operates 62 stream gaging stations. The following link provides an index listing of the stations indicating regulated or unregulated gages in addition to the drainage area. Additional information pertaining to each station such as location, type of channel, and length of record is also available by clicking on each station name.

Index of Stream Gaging Stations

Precipitation Data

Public Works operates and maintains a network of standard and automatic rain gages to collect rainfall (precipitation) data for the purposes of in-house engineering and design of flood control and water conservation facilities. As an integral part of its emergency operations, Public Works operates and maintains a state-of-the-art Automated Local Evaluation in Real Time (ALERT) computer system to monitor meteorological conditions in the County and Southern California in real time. The system includes a network of field sensors that monitor and receive precipitation data. The Near Real-Time Precipitation Map displays 1, 3, 6, 12, 24, 36, 48, and 72 hours duration and the last 30 days of ALERT rainfall data. The Map identifies the locations of 62 selected rain gages located throughout Los Angeles County.
Information on 131 Manually Observed Non-Mechanical Rain Gages is also provided. These gages are measured once daily by volunteers and reported monthly.

Precipitation Data

Well Measurement Data

The following link is to the Well Measurement Data website which is intended to graphically depict and locate Ground Water Well Data in the County of Los Angeles. The groundwater well data herein is intended to provide the public with current and historical groundwater depths throughout Los Angeles County.

Well Measurements

Hydrologic Data

All hydrologic data can be obtained by contacting the Custodian of Record.

Hydrologicrecords@dpw.lacounty.gov