Brazos River

Tributaries of the Brazos River arise just across the Texas border in New Mexico.   The river flows across most of the state of Texas, passing Brazos Bend State Park and the City of Brazoria before discharging into the Gulf of Mexico near Quintana Beach south of Freeport.
At 840 miles, the Brazos is the longest river in Texas, draining a watershed of 42,800 square miles.  Worldatlas.com cites it as one of the twelve "major rivers" of North America.
Credit: U.S. Geological Survey, Texas Sites by Basin.

The City of Brazoria lies on the southwestern bank of the river, at the intersection of SH35 and FM521.
Credit: Wikimapia.org.

The following map shows the locations of the bridges with respect to historic streets.
Credit: Brazoria County Historical Museum.

The following map shows the locations of the two extant bridges and the China Street Bridge pier.
Credit: US Geological Survey map, 7.5-minute series, Brazoria quadrangle.