Clik here to view.
House Numbering Map Grid
Abstract: Each grid in the Index Map was divided into 25 grids to create the House Numbering (HN) Map. The grids in the HN map are 3000 ft high and 4000 ft wide. The Mat_No refers to the House...
View ArticleClik here to view.
Street Lights
Abstract: Point layer of street lights in Los Angeles County.. Purpose: This dataset keeps a graphical inventory of the street lights in Los Angeles County and is updated by Los Angeles County...
View ArticleClik here to view.
Soil Types
Abstract: A polygon layer showing soil types in Los Angeles County. This layer shows the delineation and the county soil number (2-180). These soils have runoff coefficient curves associated with them...
View ArticleClik here to view.
Direction of flow within Sub Watersheds
Abstract: Direction of water flow between sub watersheds (or watershed sub basins). Data can be downloaded here
View ArticleClik here to view.
ALERT(Automatic Local Evaluation in Real Time)/Automatic rain gages
Abstract: The location of the ALERT(Automatic Local Evaluation in Real Time)/Automatic rain gages; These sites use tipping buckets with real-time data telemetry and/or electronic data loggers to...
View ArticleClik here to view.
Ground Water Basins
Abstract: This represents the groundwater basins and sub-basins as defined by the California Department of Water Resources. Groundwater basins are designated on the basis of geological and...
View ArticleClik here to view.
Watershed Management Area
Abstract: Watershed Management Area. Based on sub-watershed boundaries, which were digitized by Public Works from USGS quads. Purpose: To determine subareas within NPDES Municipal Stormwater Permit...
View ArticleClik here to view.
Water Purveyor Service Areas
Abstract: This layer is a representation of the Water Purveyor Service Areas within Los Angeles County. Purpose: General mapping, long term water supply planning, and to aid in emergency management...
View ArticleClik here to view.
Stream Gage Locations
Abstract: Stream Gage locations. Purpose: General mapping use Data can be downloaded here
View ArticleClik here to view.
Rainfall Intensity
Abstract: This data set depicts Los Angeles County precipitation intensity for 24-hour events and return periods of 50 years. Purpose: Display and/or analyses requiring precipitation intensity for...
View ArticleClik here to view.
Manually Observed Non-Mechanical Rain Gages
Abstract: Location of manually Observed Non-Mechanical Rain Gages; These gages are measured once daily by volunteers and reported monthly. Purpose: For calculating rainfall totals and intensity...
View ArticleClik here to view.
Debris Potential Areas
Abstract: Los Angeles Basin, Santa Clara River Basin, and Antelope Valley are divided into zones that yield similar volumes of sediment under similar conditions. These are called Debris Potential Area...
View ArticleClik here to view.
Los Angeles County Boundary
Abstract: Los Angeles County Boundary Purpose: General mapping use Data can be downloaded here
View ArticleClik here to view.
DPW Index Map Grid
Abstract: This is the grid used to create the Los Angeles County cadastral database. The grids are 15,000 feet high and 20,000 wide. Purpose: Base map for the cadastral database Data can be...
View ArticleClik here to view.
Los Angeles County Road Maintenance District Boundary
Abstract: Areas maintained by Los Angeles County Department of Public Works – Road Maintenance Division. Purpose: General mapping use Data can be downloaded here
View ArticleClik here to view.
Flood Maintenance District Boundary
Abstract: Areas maintained by the Los Angeles County Flood Maintenance District. Purpose: General mapping use Data can be downloaded here
View ArticleClik here to view.
County Lighting Maintenance District
Abstract: County Lighting Maintenance District shows the boundaries where Los Angeles County Traffic & Lighting Division maintains the street lights. Data can be downloaded here
View ArticleClik here to view.
Seawater Barriers
Abstract: The Los Angeles County Department of Public Works operates and maintains three seawater barriers along Los Angeles County’s coastline. Often unnoticed because of their underground nature,...
View ArticleClik here to view.
Garbage Disposal District Boundary
Abstract: This layer contains Garbage Collection boundaries within the contract cities serviced by L.A. County DPW. Disposal districts maintained by other agencies, like City of LA or LA County...
View ArticleClik here to view.
Historic LA County Supervisorial Districts (1971 – 1991)
Supervisorial District Boundaries for LA County for 1971, 1981, and 1991. Samples (click to enlarge) 1971 1981 1991 The data from 1991 was provided by the Registrar/Recorder. The data from 1971 and...
View ArticleClik here to view.
2011 Supervisorial District Boundaries (Official)
Abstract: This layer contains the 2011 Official Supervisorial District Boundary for the County of Los Angeles. Purpose: Supervisorial District Boundary map for the County of Los Angeles Access...
View ArticleClik here to view.
2011 LA County Street Centerline & Address File
CAMS Data (October 2011) Current data date: August 2012 – we will be releasing new versions of this data periodically. Important note: This file is not final – it is an intermediate step and should be...
View ArticleClik here to view.
LA County Address Points
Address Points Current data date: June 2012 – we will be releasing new versions of this data periodically. This dataset contains address points from the Countywide Address Management System, a...
View ArticleClik here to view.
2012 County of Los Angeles Bicycle Master Plan
Keywords: Bikeway, Bicycle, off-road Abstract: The dataset includes the bikeway network proposed in the 2012 County of Los Angeles Bicycle Master Plan. Purpose: The dataset includes the bikeway...
View ArticleClik here to view.
Bike Paths
May 29th, 2013 There are a number of sources of bike path data out there. We are working to combine them into a single authoritative data source, but in the meantime here are a few links to data you...
View ArticleClik here to view.
City Annexations
City Annexations This layer contains information for locating past and present legal city boundaries within Los Angeles County. These City Annexation polygons are used for city boundary analysis,...
View ArticleClik here to view.
Los Angeles County Storm Drain System
Sample Channels, Gravity Mains, Catch Basins, etc. The Los Angeles County Storm Drain System is a geometric network model representing the storm drain infrastructure within Los Angeles County. The...
View ArticleClik here to view.
LA County’s Unified House Numbering System
After 11 years in the County, and many years dealing with addresses, I just learned about our Unified House Numbering System guidelines, which points to all of the relevant source information that we...
View ArticleClik here to view.
Early Historic Surveys
This layer was created for retrieving the earliest recorded surveys of original Spanish and Mexican land grants (Ranchos), along with original plats of the United States Public Lands Survey System...
View ArticleClik here to view.
Los Angeles County Sanitary Sewers
The Consolidated Sewer Maintenance District (CSMD) of Los Angeles County is administered by the County of Los Angeles Department of Public Works (DPW). For the list of cities served, operational maps,...
View ArticleClik here to view.
Land Records Information
Sample Tract, Parcel Maps and Records of Survey To make land records more easily available to the general public, the Los Angeles County Department of Public Works began scanning and posting thousands...
View ArticleClik here to view.
Methane Producing Landfills
This data was created on April 30, 2012 to represent known disposal sites in Los Angeles County that may produce and emanate methane gas. The shapefile contains disposal sites within Los Angeles County...
View ArticleClik here to view.
Instructional Videos
We have a pair of instructional videos for the LA County GIS Data Portal that will help you make better use of the data available on this site. The first video shows you how to find and download GIS...
View ArticleClik here to view.
Stormwater Catchment Areas
Abstract: This GIS layer was created to delineate catchment areas for Municipal Separate Storm Sewer System (MS4) outfalls under the Los Angeles County Flood Control District (LACFCD) jurisdiction...
View ArticleClik here to view.
Substructure Maps
Substructure Maps Grid A limited number of Substructure maps in “pdf” format are available via GIS polygons representing grids containing URL links. Across various areas of Los Angeles County, paper...
View ArticleClik here to view.
The Works – Report A Problem
Los Angeles County, The Works This award winning application for iOS and DROID enables residents of Los Angeles County to interact with the Departments of Public Works, Parks and Recreation, Public...
View ArticleClik here to view.
Flood Insurance Rate Maps (FIRMs)
Abstract: The Federal Emergency Management Agency (FEMA) creates and provides authoritative data related to flood insurance. Flood Insurance Rate Maps (FIRMs) data, where available digitally, can be...
View ArticleClik here to view.
Flood Zones
Abstract: The Federal Emergency Management Agency (FEMA) creates and provides authoritative data related to flood insurance. Using that data, the Los Angeles County Department of Public Works has...
View ArticleClik here to view.
Active Wells
Abstract: The Los Angeles County Department of Public Works has developed a groundwater well web viewer to provide the public with current and historical groundwater depth information throughout Los...
View ArticleClik here to view.
Department of Public Works Field Facilities – Points
Abstract: The Los Angeles County Department of Public Works (DPW) facility points show the location of field facilities owned by or under the jurisdiction of DPW. These points are used by the Service...
View ArticleClik here to view.
Los Angeles County Flood Control District Right-of-Way Parcels
The Los Angeles County Department of Public Works is focused on creating an interactive environment that allows efficient access to flood control right-of-way information for our customers. This...
View ArticleClik here to view.
Mile Markers
Click Here to Download Summary Location of mile marker post with attached attributes of : TYPE is MM for Mile Marker, ST_NAME is street name, CONDITION, SURVEYOR is person who located the position,...
View ArticleClik here to view.
85th and 95th Percentile Rainfall
These layers represent the spatial distribution of the 85th and 95th percentile, 24-hour rainfall within the County of Los Angeles. Rainfall gages throughout the County were selected based on spatial...
View ArticleClik here to view.
New City of Pomona Reorganization No. 2015-14 (Detachment from Diamond Bar...
Reorganization No. 2015-14 to the City of Pomona ( Detachment from City of Diamond Bar) became effective April 13, 2017. To download the shapefile of the detachment/annexation boundary, click on the...
View ArticleLandscape Maintenance Districts Zones
This layer contains the boundaries for all of the Landscape Maintenance District Zones in the unincorporated LA County. A Landscape Maintenance District is a special district formed to provide...
View ArticleClik here to view.
Reorganization No. 2016-08 ( Detachment from the City of Monrovia ,...
Reorganization No. 2016-08 to the City of Bradbury became effective January 11, 2018. To download the shapefile of the detachment/annexation boundary, click on the link below. This shapefile download...
View ArticleClik here to view.
Near Source Zones
This dataset presents areas where an additional factor should be used to reduce risk to property and life in the event of an earthquake. The near-source maps are based on research in which most...
View ArticleClik here to view.
Annexation No. 2018-04 to the City of Santa Clarita
Annexation No. 2018-04 to the City of Santa Clarita (Plum Canyon, Skyline Ranch, and North San Canyon) became effective on November 15 2018. To download the shapefile of this annexation, please click...
View ArticleClik here to view.
Annexation No. 2015-09 to the City of Pomona
Annexation No. 2015-09 to the City of Pomona became effective January 16, 2019. To download the shapefile of this annexation, please click on below. This shapefile download includes territories...
View ArticleProposed City Reorganizations (Annexations/Detachments), Incorporation and...
The following table provides some information on “Proposed City Reorganizations” (Annexations/Detachments) within Los Angeles County which have been submitted to and accepted by “Local Agency Formation...
View Article