Stream/Reservoir Segments
Water quality standards are used by TCEQ as the maximum or minimum instream concentrations
that may result from permitted discharges and nonpoint sources and still meet designated uses. To resolve the
issues of regional and geological diversity of the state, standards are developed for classified segments.
Classified segments are defined segments of waterways that are unique from other segments. Each classified
segment has been designated a four-digit code. The Brazos River Basin is designated by the number 12. Each
classified segment is distinguished by the next two numbers, for example, the Brazos River Tidal Segment: 1201.
Appropriate water uses such as contact recreation, public water supply, and aquatic life are then applied to
the segments. Site-specific water quality criteria have been developed for water temperature, dissolved oxygen,
pH, bacteria, chloride, sulfate and total dissolved solids for classified segments. Site-specific chlorophyll
a standards have been developed for several reservoirs. Many streams that are not classified segments are
assessed throughout the state and are considered unclassified waterbodies and are coded with the four-digit
designation followed by a letter, such as 1201A. Most of these unclassified waterbodies do not have specific
water quality standards developed for them. For assessment purposes, unclassified streams are assessed using
the numeric criteria developed for the classified segment into which the stream flows unless site-specific
criteria have been developed. Site-specific water quality criteria have been developed for dissolved oxygen
and bacteria for several unclassified waterbodies.
The Brazos River basin includes 59 classified segments and 171 unclassified segments.
The classified and unclassified segments of the Brazos River basin are listed below. Of the 230 classified
segments, 185 are stream segments and 45 are reservoirs.
Brazos River Basin Subwatersheds
Double Mountain Fork and Salt Fork Watershed
| Segment 1208 |
- Brazos River above Possum Kingdom Lake |
| 1208A |
- Millers Creek Reservoir |
| Segment 1238 |
- Salt Fork Brazos River |
| 1238A |
- Croton Creek |
| Segment 1239 |
- White River |
| Segment 1240 |
- White River Lake |
| 1240A |
- White River above White River Lake |
| Segment 1241 |
- Double Mountain Fork Brazos River |
| 1241A |
- North Fork Double Mountain Fork Brazos River |
| 1241B |
- Lake Alan Henry |
| 1241C |
- Buffalo Springs Lake |
| 1241D |
- South Fork Double Mountain Fork Brazos River upstream of confluence with North Fork Double Mountain Fork |
Clear Fork Watershed
| Segment 1232 |
- Clear Fork Brazos River |
| 1232A |
- California Creek |
| 1232B |
- Deadman Creek |
| 1232C |
- Paint Creek |
| Segment 1233 |
- Hubbard Creek Reservoir |
| 1233A |
- Big Sandy Creek |
| 1233B |
- Hubbard Creek |
| Segment 1234 |
- Lake Cisco |
| Segment 1235 |
- Lake Stamford |
| Segment 1236 |
- Fort Phantom Hill Reservoir |
| 1236A |
- Cedar Creek |
| Segment 1237 |
- Lake Sweetwater |
Upper Brazos River Watershed
| Segment 1203 |
- Lake Whitney |
| 1203A |
- Steele Creek |
| Segment 1204 |
- Brazos River below Lake Granbury |
| 1204A |
- Camp Creek |
| Segment 1205 |
- Lake Granbury |
| 1205A |
- McCarty Branch |
| 1205B |
- Bee Creek |
| 1205C |
- Walnut Creek |
| 1205D |
- Contrary Creek |
| 1205E |
- Rucker Creek |
| 1205F |
- Strouds Creek |
| 1205G |
- Robinson Creek |
| 1205H |
- Long Creek |
| Segment 1206 |
- Brazos River below Possum Kingdom Lake |
| 1206B |
- Rock Creek |
| 1206D |
- Palo Pinto Creek below Palo Pinto Lake |
| 1206E |
- Lake Mineral Wells |
| Segment 1207 |
- Possum Kingdom Lake |
| Segment 1208 |
- Brazos River Above Possum Kingdom Lake |
| Segment 1227 |
- Nolan River |
| 1227A |
- Buffalo Creek |
| Segment 1228 |
- Lake Pat Cleburne |
| Segment 1229 |
- Paluxy River |
| 1229A |
- Squaw Creek Reservoir |
| Segment 1230 |
- Lake Palo Pinto |
| 1230A |
- Palo Pinto Creek above Lake Palo Pinto |
| Segment 1231 |
- Lake Graham |
| Segment 1257 |
- Brazos River below Lake Whitney |
Aquilla Creek Watershed
| Segment 1254 |
- Lake Aquilla |
| 1254A |
- Hackberry Creek |
| 1254B |
- Aquilla Creek upstream of Aquilla Reservoir |
| 1256A |
- Aquilla Creek |
Bosque River Watershed
| Segment 1225 |
- Lake Waco |
| 1225A |
- Hog Creek |
| Segment 1226 |
- North Bosque River |
| 1226A |
- Duffau Creek |
| 1226B |
- Green Creek |
| 1226C |
- Meridian Creek |
| 1226D |
- Neils Creek |
| 1226E |
- Indian Creek |
| 1226F |
- Sims Creek |
| 1226G |
- Spring Creek |
| 1226H |
- Alarm Creek |
| 1226I |
- Gilmore Creek |
| 1226J |
- Honey Creek |
| 1226K |
- Little Duffau Creek |
| 1226L |
- South Fork Little Green Creek |
| 1226M |
- Little Green Creek |
| 1226N |
- Indian Creek Reservoir |
| 1226O |
- Sims Creek Reservoir |
| 1226P |
- Spring Creek Reservoir |
| 1226Q |
- Walker Branch |
| Segment 1246 |
- Middle Bosque/South Bosque River |
| 1246A |
- Harris Creek |
| 1246C |
- Unnamed Tributary of South Bosque River |
| 1246D |
- Tonk Creek |
| 1246E |
- Wasp Creek |
| Segment 1255 |
- Upper North Bosque River |
| 1255A |
- Goose Branch |
| 1255B |
- North Fork Upper North Bosque River |
| 1255C |
- Scarborough Creek |
| 1255D |
- South Fork North Bosque River |
| 1255E |
- Unnamed Tributary of Goose Branch |
| 1255F |
- Unnamed Tributary of Scarborough Creek |
| 1255G |
- Woodhollow Branch |
| 1255H |
- South Fork Upper North Bosque River Reservoir |
| 1255I |
- Dry Branch |
| 1255J |
- Goose Branch Reservoir |
| 1255K |
- Scarborough Creek Reservoir |
| Segment 1256 |
- Brazos River/Lake Brazos |
Leon River Watershed
| Segment 1218 |
- Nolan Creek |
| 1218A |
- Unnamed Tributary to Little Nolan Creek |
| 1218B |
- South Nolan Creek |
| 1218C |
- Little Nolan Creek |
| Segment 1219 |
- Leon River below Belton Lake |
| Segment 1220 |
- Belton Lake |
| 1220A |
- Cowhouse Creek |
| Segment 1221 |
- Leon River below Lake Proctor |
| 1221A |
- Resley Creek |
| 1221B |
- South Leon River |
| 1221C |
- Pecan Creek |
| 1221D |
- Indian Creek |
| 1221E |
- Plum Creek |
| 1221F |
- Walnut Creek |
| 1221G |
- Coryell Creek |
| Segment 1222 |
- Lake Proctor |
| 1222A |
- Duncan Creek |
| 1222B |
- Rush-Copperas Creek |
| 1222C |
- Sabana River |
| 1222D |
- Sowells Creek |
| 1222E |
- Sweetwater Creek |
| 1222F |
- Hackberry Creek |
| Segment 1223 |
- Leon River below Leon Reservoir |
| 1223A |
- Armstrong Creek |
| 1223B |
- Cow Creek |
| Segment 1224 |
- Lake Leon |
| Segment 1259 |
- Leon River Above Belton Lake |
Lampasas River Watershed
| Segment 1215 |
- Lampasas River below Stillhouse Hollow Lake |
| Segment 1216 |
- Stillhouse Hollow Lake |
| 1216A |
- Trimmier Creek |
| 1216B |
- Onion Creek |
| Segment 1217 |
- Lampasas River above Stillhouse Hollow Lake |
| 1217A |
- Rocky Creek |
| 1217B |
- Sulphur Creek |
| 1217C |
- Simms Creek |
| 1217D |
- North Fork Rocky Creek |
| 1217E |
- South Fork Rocky Creek |
| 1217F |
- Reese Creek |
| 1217G |
- Clear Creek |
| Segment 1242 |
- Brazos River Above Navasota River |
| Segment 1243 |
- Salado Creek |
Little River Watershed
| Segment 1213 |
- Little River |
| 1213A |
- Big Elm Creek |
| 1213B |
- Little Elm Creek |
| 1213C |
- Unnamed Tributary of Little Elm Creek |
| Segment 1214 |
- San Gabriel River |
| Segment 1244 |
- Brushy Creek |
| 1244A |
- Brushy Creek above South Brushy Creek |
| 1244B |
- Lake Creek |
| 1244D |
- South Brushy Creek |
| Segment 1247 |
- Lake Granger |
| 1247A |
- Willis Creek |
| Segment 1248 |
- San Gabriel/North Fork San Gabriel River |
| 1248A |
- Berry Creek |
| 1248B |
- Huddleston Branch |
| 1248C |
- Mankins Branch |
| 1248D |
- Middle Fork San Gabriel River |
| Segment 1249 |
- Lake Georgetown |
| Segment 1250 |
- South Fork San Gabriel River |
| Segment 1251 |
- North Fork San Gabriel River |
Navasota River Watershed
| Segment 1209 |
- Navasota River below Lake Limestone |
| 1209A |
- Country Club Lake |
| 1209B |
- Fin Feather Lake |
| 1209C |
- Carters Creek |
| 1209D |
- Country Club Branch |
| 1209E |
- Wickson Creek |
| 1209F |
- Wolfpen Creek |
| 1209G |
- Cedar Creek |
| 1209H |
- Duck Creek |
| 1209I |
- Gibbons Creek |
| 1209J |
- Shepherd Creek |
| 1209K |
- Steele Creek |
| 1209L |
- Burton Creek |
| 1209N |
- Gibbons Creek Reservoir |
| 1209O |
- Normangee Lake |
| 1209P |
- Clear Creek |
| Segment 1210 |
- Lake Mexia |
| 1210A |
- Navasota River above Lake Mexia |
| Segment 1252 |
- Lake Limestone |
| Segment 1253 |
- Navasota River below Lake Mexia |
| 1253A |
- Springfield Lake |
Central Brazos River Watershed
| Segment 1242 |
- Brazos River above Navasota River |
| 1242A |
- Marlin City Lakes System |
| 1242B |
- Cottonwood Branch |
| 1242C |
- Still Creek |
| 1242D |
- Thompson Creek |
| 1242E |
- Little Brazos River |
| 1242F |
- Pond Creek |
| 1242H |
- Tradinghouse Reservoir |
| 1242I |
- Campbells Creek |
| 1242J |
- Deer Creek |
| 1242K |
- Mud Creek |
| 1242L |
- Pin Oak Creek |
| 1242M |
- Spring Creek |
| 1242N |
- Tehuacana Creek |
| 1242O |
- Walnut Creek |
| 1242P |
- Big Creek |
| 1242Q |
- Bull Hide Creek |
| 1242R |
- Cow Bayou |
| Segment 1256 |
- Brazos River/Lake Brazos |
Yegua Creek Watershed
| Segment 1211 |
- Yegua Creek |
| 1211A |
- Davidson Creek |
| Segment 1212 |
- Somerville Lake |
| 1212A |
- Middle Yegua Creek |
| 1212B |
- East Yegua Creek |
| 1212C |
- Nail Creek |
| 1212D |
- Cedar Creek |
| 1212E |
- McCain Creek |
| 1212F |
- Burns Creek |
| 1212G |
- Jerdelle Creek |
| 1212H |
- Sandy Branch |
| 1212I |
- Birch Creek |
| 1212J |
- Big Creek |
| 1212K |
- Brushy Creek |
| 1212L |
- Yegua Creek |
Lower Brazos River Watershed
| Segment 1201 |
- Brazos River Tidal |
| Segment 1202 |
- Brazos River below Navasota River |
| 1202B |
- Rabbs Bayou |
| 1202C |
- Hog Branch |
| 1202E |
- Little Sandy Creek |
| 1202H |
- Allen's Creek |
| 1202I |
- Bessie's Creek |
| 1202J |
- Big Creek |
| 1202K |
- Mill Creek |
| 1202P |
- Pond Creek |
| 1202Q |
- Clear Creek |
| Segment 1245 |
- Upper Oyster Creek |
| 1245B |
- Brown's Bayou |
| 1245C |
- Bullhead Bayou |
| 1245D |
- Unnamed Tributary of Bullhead Bayou |
| 1245F |
- Alcorn Bayou |
| 1245I |
- Steep Bank Creek |
Upper Oyster Creek Watershed
| Segment 1245 |
- Upper Oyster Creek |
| 1245A |
- Red Gully |
| 1245E |
- Flewellen Creek |
| 1245F |
- Alcorn Bayou |
| 1245G |
- Brooks Lake |
| 1245H |
- Alkire Lake |
| 1245J |
- Stafford Run |