Water Planning Data for Region M (Rio Grande)

Arroyo Colorado

This tidal segment of the Arroyo Colorado (TNRCC classified segment 2201) runs just upstream of Port of Harlingen to its confluence with Laguna Madre in Willacy/Cameron Counties.

Las Moras Creek

From the confluence with the Rio Grande in Maverick County upstream to the Maverick/Kinney County line.

Rio Grande

From the confluence with the Gulf of Mexico in Cameron County upstream to Falcon Dam in Starr County (TNRCC classified stream segments 2301 and 2302).