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New City of Pomona Reorganization No. 2015-14 (Detachment from Diamond Bar and Annexation to Pomona)

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 link below. The overlapping polygons indicate territories that transferred between cities.

Reorganization No. 2015-14 to City of Pomona ( Detachment from City of […]

Los Angeles County Road Maintenance District Boundary

Abstract: Areas maintained by Los Angeles County Department of Public Works, Road Maintenance Division. Purpose: General mapping and field operations.

Los Angeles County Road Maintenance District Service Areas

Download Data : shapefile

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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 during drought.

Download Data (last update 2016)

A list of Water Companies is attached in this Excel File: Water […]

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 distribution and rainfall record length to determine the 85th and 95th percentile, 24-hour rainfall. The 85th and 95th percentile, 24-hour rainfall can be used to […]

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, SOURCE is GNSS for Trimble R8 receiver or GEOXH for the GeoXH 6000 receiver, POINTID is data collection point number […]

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 dataset contains the boundaries of the Los Angeles County Flood Control District (LACFCD) right-of-way parcels and distinguishes between fee, easement, quitclaim, and other.

 

Download: LACFCD […]

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 Locator web application that allows the public to find the location of services provided by DPW.

Purpose:

To locate public […]

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 Angeles County.

 

Purpose:

To provide active wells information to the public.

 

Supplemental Information:

 

The State of California Department of […]

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 developed a public-facing web viewer for accessing flood zone information in the County of Los Angeles (Flood Zone Determination Website). Flood zones are […]

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 found on the official FEMA’s National Flood Hazard Layer.

Looking for more than just FIRMs? Visit Search All Products to access the full […]

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 Health, and Regional Planning by

Requesting facility and trail maintenance at County parks, as well as reporting potential health and safety […]

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 maps were created by the Department of Public Works (DPW) and its predecessors to show underground utilities such as cable TV, gas, […]

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 pursuant to a 2012 National Pollutant Discharge Elimination System (NPDES) permit.

 

Description: The data is a compilation of storm drain hydrology studies completed by the […]

LA County Street & Address File

Starting in September 2014, the data will be uploaded every week on Sunday with the newest revisions from the CAMS system.

Important note: This is the first output of the final data structure. In the next few weeks we will begin providing weekly updates as well as a number of related symbolization […]

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 data from our site, while the second shows you how to use free software to […]

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 that once accepted degradable refuse material. Information used to create this data was extracted from a landfill survey performed by […]

Land Records Information

To make land records more easily available to the general public, the Los Angeles County Department of Public Works began scanning and posting thousands of documents online, free of charge.

The best method of accessing these records is via the Land Records Information website. […]

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, or for more information about the CSMD, please visit the November 7th, 2013 | Tags: , , , , | Category: Basemaps and Grids, Free, Infrastructure, Public Works | 2 comments

Los Angeles County Boundary

We’ve moved!

The Los Angeles County boundary, along with the city boundary lines and polygons, were consolidated into the City Annexations post on this portal.

 

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 (PLSS). The URL field points to documents (PDF) on the Land […]

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 use to assign house numbers in the Unincorporated portion of the county. Many cities were incorporated after this was adopted in […]

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 long term goal of this network […]

City Boundaries and Annexations/Detachments

 

View City Annexations/Detachments Online

Online Viewer – Use this application to search, view, and download county/city/annexation/detachment boundaries as well as recorded annexation/detachment documents, maps, and legal descriptions.

Online Mobile – Using ArcGIS Online, this map […]

Bike Ways

April 11th, 2017

There are a number of sources of bikeway data out there. Currently, we host the most comprehensive and authoritative data source available to the public, please see:

http://dpw.lacounty.gov/bike/map.cfm

This site currently relies on a dataset from 2012. We are working to update this to the latest dataset available and […]

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 network proposed in the 2012 County of Los Angeles Bicycle Master Plan. The Plan proposes more than 800 miles of bikeways to be installed throughout the […]

LA County Address Points

Address Points

Current data date: August 2014 – we will be updating this information weekly.

This dataset contains address points from the Countywide Address Management System, a collaborative program between the County’s Registrar/Recorder, Chief Information Officer, Public Works Department, Department of Regional Planning, and many local cities to manage […]

2011 Supervisorial District Boundaries (Official)

Abstract: This layer contains the 2011 Official Supervisorial District Boundary for the County of Los Angeles, drawn at the parcel level, per Assessor parcels and the County Cadastral Landbase.Download Data

Download the 2011 Supervisorial District Boundaries (zipped shapefile)

Purpose: Supervisorial District Boundary maps for the County of Los Angeles

Supplemental Information: Adopted […]

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 1981 was digitized from scanned and rectified County Engineer maps provided […]

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

Download Data

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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 (DPA) zones. Sediment production from a watershed is a rate at which sediment passes a particular point, usually expressed as cubic yards per square […]

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 Sanitation District, are not shown here. Purpose: General mapping use

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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, these facilities serve as Los Angeles basin’s fresh water sentinels. They protect a significant portion of the area’s drinking water supply from ocean water, which constantly attempts […]

County Lighting Maintenance District

Abstract: County Lighting Maintenance District shows the boundaries where Los Angeles County Traffic & Lighting Division maintains the street lights.

 

Traffic and Lighting is a Division of the Los Angeles County Department of Public Works.

GIS data available on this […]

Flood Maintenance District Boundary

Abstract: Areas maintained by the Los Angeles County Flood Maintenance District. Purpose: General mapping use The Los Angeles County Flood Control District is managed by the Los Angeles County Department of Public Works. Download Data

Information on the Los […]

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 Download Data […]

Ground Water Basins

Abstract: This data was acquired from the Integrated Water Resources Information System (IWRIS), hosted by the California Department of Water Resources(DWR). The Bulletin 118 Groundwater Basins shapefile was downloaded, projected to the CCS83 Zone 5 (ftUS) Map projection and clipped to the Los Angeles County Boundary for internal Los Angeles County use.It is […]

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 indicate rainfall totals and intensities. Purpose: Data collected is used for calculating rainfall totals and intensities.

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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

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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 Los Angeles County Supplemental Information: Water Resources is a Division of the Los Angeles County Department of Public Works. More information is available on their

Stream Gage Locations

Abstract: Stream Gage locations

Purpose: General mapping use

Download Data

Direction of flow within Sub Watersheds

Abstract: Direction of water flow between sub watersheds (or watershed sub basins). Download Data

Soil Types

Abstract: This layer was created to represent soil types in Los Angeles County. Polygons were derived from scanned soil maps. Attributes include a soil number (2-180), corresponding to runoff coefficient values in a Hydrology Manual, provided by the Los Angeles County Department of Public Works, Water Resources Division.

Purpose: For use in DPW’s Modified […]

Street Lights

Abstract: Point layer of street lights in Los Angeles County.Purpose: This data is used for maintaining inventory of street lights by Traffic and Lighting, a Division of the Los Angeles County Department of Public Works.

Download Data

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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 Numbering Grid and the IM_No refers to the Index Map grid. Purpose: Base map for […]

Los Angeles County Sub Watersheds

Abstract: Boundaries of sub watersheds or watershed sub areas. Original areas were drawn on U.S.G.S. 7 ½ minute, 1:24,000 scale topo quad sheets by Hydraulic Water Conservation Division. Digitized into ComputerVision CADDS4 by Environmental Programs Division (EPD). Converted to Atlas GIS Atlas Graphic Format (.agf) by EPD. Cleaned up, topology built, downstream connectivity developed […]

Santa Monica Bay Major Watersheds

Abstract: Major individual Watersheds within the Santa Monica Bay Watersheds. Purpose: To identify Major watersheds within the Santa Monica Bay Watersheds

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Spreading Grounds

Abstract: This layer was created to represent stormwater spreading grounds operated by the Los Angeles County Department of Public Works. These spreading grounds are selected and managed for capturing as much water as possible during storms. Locations were chosen with permeable soil formations to enable recharging of underground aquifers. An estimated 30 to 40 […]

Debris Basin – Right of Way

Abstract: The debris basin right of way depicts the limits of ownership or access rights in fee or ease within the facility. The debris basin itself consists of an earth dam or other barrier constructed across a drainageway or other suitable location for collecting sediment. The dam is provided with properly designed spillways to […]

Dams and Debris Basins – Point Locations

Abstract:

Debris Basins are key components of the Los Angeles County Flood Control District’s (LACFCD) flood control system. Typically located at the mouths of canyons, debris basins capture sediment, gravel, boulders, and vegetative debris that are washed out of the canyons during storms, protecting lower lying communities from possible flooding and property damage. Due […]

Catch Basins

 

Abstract: Location of DPW, LACFCD and some City catchbasins.

 

Purpose: To map Catch Basin locations for cleanout contracts. Also for general mapping purposes.

This data has been phased out of use. For current data, please visit the Storm Drain […]