answers.input_text: short
answers.span_text: Llano Estacado Source confluence Stonewall County , Texas - elevation 453 m ( 1,486 ft ) - coordinates 33 ° 16 ′ 07 '' N 100 ° 0 ′ 37 '' W ﻿ / ﻿ 33.26861 ° N 100.01028 ° W ﻿ / 33.26861 ; - 100.01028 Mouth Gulf of Mexico
questions: where does the brazos river start and stop
name: Brazos River
contexts: Brazos River Texas Brazos River downstream of Possum Kingdom Lake , Palo Pinto County , Texas Country United States State Texas Source Llano Estacado Source confluence Stonewall County , Texas - elevation 453 m ( 1,486 ft ) - coordinates 33 ° 16 ′ 07 '' N 100 ° 0 ′ 37 '' W ﻿ / ﻿ 33.26861 ° N 100.01028 ° W ﻿ / 33.26861 ; - 100.01028 Mouth Gulf of Mexico - location Brazoria County , Texas - elevation 0 m ( 0 ft ) - coordinates 28 ° 52 ′ 33 '' N 95 ° 22 ′ 42 '' W ﻿ / ﻿ 28.87583 ° N 95.37833 ° W ﻿ / 28.87583 ; - 95.37833 Coordinates : 28 ° 52 ′ 33 '' N 95 ° 22 ′ 42 '' W ﻿ / ﻿ 28.87583 ° N 95.37833 ° W ﻿ / 28.87583 ; - 95.37833 Length 1,352 km ( 840 mi ) Basin 116,000 km ( 44,788 sq mi ) Discharge for Rosharon , TX - average 237.5 m / s ( 8,387 cu ft / s ) - max 2,390 m / s ( 84,402 cu ft / s ) - min 0.76 m / s ( 27 cu ft / s ) Brazos River watershed Website : Handbook of Texas : Brazos River