The Texas Historical Commission (THC) is a state agency that has a GIS database that includes information related to historical sites, historical markers, cemeteries, county courthouses, and more. Another useful resource for environmental-related data is TNRIS. This online database has information regarding natural resources such as flood areas, culverts, bridges, low points, ground covers, and the Federal Emergency Management Agency (FEMA) zones.

Environmental data related to US Fish and Wildlife Service (USFWS) and US Army Corps of Engineers (USACE) can be reviewed as well. While information related to these resources is tied more to the Environmental Assessment (EA) process, avoiding areas such as wetlands, critical habitats, and superfund sites could help prevent untimely changes that affect the design, cost, and schedule.