| Segment Number | Segment Description
|
|---|
| 2001 | Mission River Tidal: from the confluence with Mission Bay in Refugio County to a point 7.4 km (4.6 miles) downstream of US 77 in Refugio County |
| 2002 | Mission River Above Tidal: from a point 7.4 km (4.6 miles) downstream of US 77 in Refugio County to the confluence of Blanco Creek and Medio Creek in Refugio County |
| 2003 | Aransas River Tidal: from the confluence with Copano Bay in Aransas/Refugio County to a point 1.6 km (1.0 mile) upstream of US 77 in Refugio/San Patricio County |
| 2004 | Aransas River Above Tidal: from a point 1.6 km (1.0 mile) upstream of US 77 in Refugio/San Patricio County to the confluence of Poesta Creek and Aransas Creek in Bee County |
| 2101 | Nueces River Tidal: from the confluence with Nueces Bay in Nueces County to Calallen Dam 1.7 km (1.1 miles) upstream of US 77/IH 37 in Nueces/San Patricio County |
| 2102 | Nueces River Below Lake Corpus Christi: from Calallen Dam 1.7 km (1.1 miles) upstream of US 77/IH 37 in Nueces/San Patricio County to Wesley E. Seale Dam in Jim Wells/San Patricio County |
| 2103 | Lake Corpus Christi: from Wesley E. Seale Dam in Jim Wells/San Patricio County to a point 100 m (110 yards) upstream of US 59 in Live Oak County, up to the normal pool elevation of 94.0 feet (impounds Nueces River) |
| 2104 | Nueces River Above Frio River: from the confluence of the Frio River in Live Oak County to Holland Dam in LaSalle County |
| 2105 | Nueces River Above Holland Dam: from Holland Dam in LaSalle County to a point 100 m (110 yards) upstream of FM 1025 in Zavala County |
| 2106 | Nueces/Lower Frio River: from a point 100 m (110 yards) upstream of US 59 in Live Oak County to Choke Canyon Dam in Live Oak County |
| 2107 | Atascosa River: from the confluence with the Frio River in Live Oak County to the confluence of the West Prong Atascosa River and the North Prong Atascosa River in Atascosa County |
| 2108 | San Miguel Creek: from a point immediately upstream of the confluence of Mustang Branch in McMullen County to the confluence of San Francisco Perez Creek and Chacon Creek in Frio County |
| 2109 | Leona River: from the confluence with the Frio River in Frio County to US 83 in Uvalde County |
| 2110 | Lower Sabinal River: from the confluence with the Frio River in Uvalde County to a point 100 m (110 yards) upstream of SH 127 in Uvalde County |
| 2111 | Upper Sabinal River: from a point 100 m (110 yards) upstream of SH 127 in Uvalde County to the most upstream crossing of FM 187 in Bandera County |
| 2112 | Upper Nueces River: from a point 100 m (110 yards) upstream of FM 1025 in Zavala County to the confluence of the East Prong Nueces River and Hackberry Creek in Edwards County |
| 2113 | Upper Frio River: from a point 100 m (110 yards) upstream of US 90 in Uvalde County to the confluence of the West Frio River and the East Frio River in Real County |
| 2114 | Hondo Creek: from the confluence with the Frio River in Frio County to FM 470 in Bandera County |
| 2115 | Seco Creek: from the confluence with Hondo Creek in Frio County to the confluence of West Seco Creek in Bandera County |
| 2116 | Choke Canyon Reservoir: from Choke Canyon Dam in Live Oak County to a point 4.2 km (2.6 miles) downstream of SH 16 on the Frio River Arm in McMullen County and to a point 100 m (110 yards) upstream of the confluence of Mustang Branch on the San Miguel Creek Arm in McMullen County, up to the normal pool elevation of 220.5 feet (impounds Frio River) |
| 2117 | Frio River Above Choke Canyon Reservoir: from a point 4.2 km (2.6 miles) downstream of SH 16 in McMullen County to a point 100 m (110 yards) upstream of US 90 in Uvalde County |
| 2201 | Arroyo Colorado Tidal: from the confluence with Laguna Madre in Cameron/Willacy County to a point 100 m (110 yards) downstream of Cemetery Road south of Port Harlingen in Cameron County |
| 2202 | Arroyo Colorado Above Tidal: from a point 100 m (110 yards) downstream of Cemetery Road south of Port Harlingen in Cameron County to FM 2062 in Hidalgo County |
| 2203 | Petronila Creek Tidal: from the confluence of Chiltipin Creek in Kleberg County to a point 1 km (0.6 miles) upstream of private road crossing near Laureles Ranch in Kleberg County |
| 2204 | Petronila Creek Above Tidal: from a point 1 km (0.6 miles) upstream of private road crossing near Laureles Ranch in Kleberg County to the confluence of Agua Dulce and Banquete Creeks in Nueces County |
| 2462 | San Antonio Bay/Hynes Bay/Guadalupe Bay |
| 2463 | Mesquite Bay/Carlos Bay/Ayres Bay |
| 2471 | Aransas Bay |
| 2472 | Copano Bay/Port Bay/Mission Bay |
| 2473 | St. Charles Bay |
| 2481 | Corpus Christi Bay |
| 2482 | Nueces Bay |
| 2483 | Redfish Bay |
| 2484 | Corpus Christi Inner Harbor: from US 181 to Viola Turning Basin |
| 2485 | Oso Bay |
| 2491 | Laguna Madre |
| 2492 | Baffin Bay/Alazan Bay/Cayo del Grullo/Laguna Salada |
| 2493 | South Bay |
| 2494 | Brownsville Ship Channel |
| 2501 | Gulf of Mexico: from the Gulf shoreline to the limit of Texas' jurisdiction between Sabine Pass and Brazos Santiago Pass |
