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State Highway Network Postmiles Tenth

Postmiles are valid postmile points at 0.1 (1/10th) mile intervals, based on the Caltrans Linear Referencing System. Exceptions that are included are the beginning and ends of routes (and other situations) that don't necessarily begin or end on the even 0.1 mile interval. This geometry is based upon the extraction from TSN on 8 June 2025. . Route geometry updates based upon this extraction include routes 3, 36, 38, 49, 89, 139, 174, and 221. All updates received an update date of 6/8/2025 except for route 221 which received a date of 7/1/2025.

Data files

Data title and descriptionAccess dataFile detailsLast updated

CSV

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CSV
03/29/25

Shapefile

DownloadZIP
03/29/25

GeoJSON

DownloadGEOJSON
03/29/25

KML

DownloadKML
03/29/25

File Geodatabase

DownloadZIP
03/29/25

Supporting files

Data title and descriptionAccess dataFile detailsLast updated

ArcGIS Hub Dataset

HTML
03/29/25

ArcGIS GeoService

ARCGIS GEOSERVICES REST API
03/29/25

API endpoint

Dataset Name

Use the query web API to retrieve data with a set of basic parameters. Copy the API endpoint you need to start.

Usage documentation