Harvey Basemap Data Collections

This collection contains map data often used as base layers for hydrologic and geographic analysis, organized by these categories:
- Addresses and Boundaries (Texas address points, counties, Councils of Government boundaries, Texas Dept of Public Safety districts and regions)
- Hydrology for the Harvey study area across southeast Texas, Louisiana, Mississippi and Arkansas (streams, gages, dams, catchments, watersheds)
- Transportation (Texas roads, railways, bridges, low water crossings)
- Social Vulnerability Index (SVI) developed by the U.S. Centers for Disease Control (CDC). This is used by the emergency response community to anticipate areas where social support systems are weaker, and residents may be more likely to need help.

These data layers generally date to 2015-2016, so could be considered reasonably representative of the base layers at the time of Hurricane Harvey.

Note on November 2023 updates: due to numerous updates among the resources linked below, this collection has been updated to point to the most recent resources.