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Public Works (Spatial Information Library)

February 25, 2010, 3:18 pm
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The Los Angeles County Department of Public Works provides a Spatial Information Library for CAD and GIS data.  The data is not loaded from this Data Portal, but can be viewed by visiting the link below.

Spatial Information Downloads
Download GIS files in ArcView shapefile format and examine their metadata.

DGN Downloads
Search using an address, street intersections or thomas guide pages. Navigate to a desired location with the zoom tool to download our house numbering and index maps in microstation design file format (DGN). Locate multiple DGN files for a specific region.

Some layers included (this is not an exhaustive list):   catch basin retrofits, governmental units, hydrography, soil types, sewer, storm drains and street lights.

Click here for the Department of Public Work’s Spatial Information Library.

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Aerial Imagery (2001)

December 23, 2010, 6:17 pm
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This aerial imagery was captured in 2001 in a cooperative project between the Los Angeles County Department of Public Works and Regional Planning.

It represents the initial imagery capture by the County of Los Angeles, which later become the Los Angeles Regional Imagery Acquisition Consortium (LAR-IAC).

Three imagery resolutions were captured:

  • 1 foot imagery in Urban Areas
  • 1 Meter imagery for the urban/forest interface
  • 2 meter imagery for the national forest.

1 foot capture area

1 meter capture area

2 meter capture area

Combined

Detailed (1 foot)

Resolution Comparison

Layer File (for internal County Staff)

EMERGE Imagery (2001) Layer File (with all three resolutions)

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Catch Basin Retrofits

January 11, 2011, 3:53 pm
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Abstract:
Catch basins retrofitted with manually retractable screen (MRS), automatic retractable screen (ARS) or fixed basket insert (FBI). 
Purpose:
To identify and locate catch basins with retrofit for inspection purposes. This is to ensure that they are functioning properly during a storm event. 
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Building and Safety District Boundaries

January 11, 2011, 4:16 pm
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Abstract:
Polygon layer showing areas serviced by the different building and safety district offices within unincorporated county areas.
Purpose:
Building and Safety Permits
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Catch Basins

January 11, 2011, 4:34 pm
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Abstract:
Location of DPW, LACFCD and some City catchbasins.
 
Purpose:
To map Catch Basin locations for cleanout contracts. Also for general mapping purposes. 
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Debris Basin – Point Location

January 11, 2011, 4:37 pm
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Abstract:
Debris Basins are key components of the Los Angeles County Flood Control District’s 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 but allow water to flow into the downstream storm drain system, thereby protecting drainage systems and communities in lower-lying watershed areas from possible flooding and property damage. 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 dispose of excess runoff water at safe velocities that will not damage the dam or other improvements. The sediment basin is a small pool of water through which the runoff from the adjacent land must flow. As the silt-laden runoff flows through the pool, it slows down and loses its capacity to carry the larger silt particles, which drop out into the pool.
 
Purpose:
Point location of 162 debris basins maintained by Public Works. 
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Debris Basin – Right of Way

January 11, 2011, 4:40 pm
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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 dispose of excess runoff water at safe velocities that will not damage the dam or other improvements. The sediment basin is a small pool of water through which the runoff from the adjacent land must flow. As the silt-laden runoff flows through the pool, it slows down and loses its capacity to carry the larger silt particles, which drop out into the pool.
 
Purpose:
For General Mapping use
 
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Spreading Grounds

January 11, 2011, 5:00 pm
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Abstract:
This data set contains Los Angeles County spreading ground data as provided by the LA County Public Works Department (Water Resources). The use of water conservation facilities adjacent to river channels and in soft-bottom channels permits water to percolate into groundwater basins for later pumping. These water spreading facilities are located in areas where the underlying soils are composed of permeable formations and in hydraulic connection with the underlying aquifer. The various types of water conserved, local, imported, and reclaimed are construed to have the following meanings – Local water is primarily runoff due to rainfall on the mountain and valley watersheds, dam releases, and rising water within the County. Imported water is water originating outside the County either from Northern California or from the Colorado River. Reclaimed water is the effluent produced by the Whittier Narrows Water Reclamation Plant, the San Jose Creek Water Reclamation Plant, and the Pomona Water Reclamation Plant, all operated by the Los Angeles County Sanitation District. The importance of this activity is apparent when it is realized that about 30 to 40 percent of the water used in the County is pumped from groundwater supplies. The growth of the County, combined with periodic droughts, has seriously depleted these supplies on numerous occasions. The Department of Public Work’s policy is to conserve the maximum possible amount of storm water consistent with runoff quantity and quality, capacities of the spreading facilities, and groundwater conditions.
 
Purpose:
To map the location of recharge facilities.
Supplemental Information:
 
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Santa Monica Bay Major Watersheds

January 11, 2011, 5:10 pm
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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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Los Angeles County Sub Watersheds

January 11, 2011, 5:12 pm
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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 in Atlas GIS. Converted to ArcView Shape (.shp) by EPD.
 
Purpose:
Drainage Basins for Los Angeles County as used for the National Pollutant Discharge Elimination System (NPDES) Permit 
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Pump Stations Maintained by the Los Angeles County Sewer Maintenance Districts (SMD)

January 12, 2011, 8:12 am
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Abstract:
Pump Stations Maintained by the Los Angeles County Sewer Maintenance Districts (SMD).
 
Purpose:
Identifies sanitary sewer lift stations maintained by the Department of Public Works

 
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House Numbering Map Grid

January 27, 2011, 3:53 pm
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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 the cadastral database
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Storm Drain Geometric Network

January 27, 2011, 3:56 pm
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Abstract:
The Los Angeles County Sanitation Districts spearheaded the SDI to tie all of the sources of information together for the benefit of local cities, county, regional authorities, and environmental interest groups.
 
Purpose:
The Storm Drain Initiative (SDI) is a cooperative effort to develop and maintain a complete geographical information systems (GIS) layer of the storm water management infrastructure within Los Angeles County. The storm drain systems within the county are owned, operated, and maintained by multiple jurisdictions. Because of this, information on the location, status, and connectivity of storm drain structures is segmented.
 
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Storm Drain Names

January 27, 2011, 3:56 pm
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Sewer Maintenance Operations Map Sub Grid

January 27, 2011, 3:56 pm
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Abstract:
Sewer Maintenance Operations Map Sub Grid. Each Op map originally divided into 12 sub grids A1 through D3.
 
Purpose:
For showing and querying facilities that lie within different Sewer Maintenance operations map sub grids
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Sewer Maintenance Operations Map Grid

January 27, 2011, 3:56 pm
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Abstract:
Sewer Maintenance Operations Map Grid.
 
Purpose:
For showing and querying facilities that lie within different Sewer Maintenance operations maps

 
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Maintenance holes not maintained by Los Angeles County

January 27, 2011, 3:56 pm
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Abstract:
City Sanitary and Private Sewer Maintenance Holes not Maintained by LA County.
 
Purpose:
To identify nearby private and city sanitary sewer structures that county sewer crews do not maintain
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Maintenance Holes maintained by the Los Angeles County Sewer Maintenance Districts (SMD)

January 27, 2011, 3:56 pm
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Abstract:
Maintenance Holes Maintained by the Los Angeles County Sewer Maintenance Districts (SMD).
 
Purpose:
Identifies sanitary sewer maintence holes maintained by the Department of Public Works 
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Street Lights

January 27, 2011, 3:56 pm
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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 Department of Public Works (Traffic and Lighting Division).
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Storm Drains

January 27, 2011, 3:56 pm
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