Rio Grande

About

Juan de Oñate, 1598 — First Spanish Settlement on the Rio Grande. The Rio Grande measures 1,896 miles from its source in the San Juan Mountains of Colorado to the Gulf of Mexico, making it the fifth-longest river in North America. For 1,255 of those miles it forms the border between the United States and Mexico. The Texas segment covered here — 145 miles through Presidio, Brewster, and Terrell counties — is a slower, canyon-cut stretch, rated Class I-II, with an optimal boating range of roughly 325 to 950 CFS against a long-term average of 635 CFS at gauge 08375300.

Long before any survey crew arrived, the river flowed through the ancestral territory of the region's Indigenous peoples, serving as a primary travel corridor, hunting ground, and gathering place. The nineteenth-century treaties, the 1830 Indian Removal Act, and the allotment era of the 1840s through the 1890s established the cession framework that reshaped who held the land along its banks.

The European chapter opens with Juan de Oñate. On April 30, 1598, the conquistador — soon the first Spanish governor of Nuevo México — crossed the Rio Grande at El Paso del Norte and claimed the whole valley for Spain. His expedition established the first permanent Spanish settlements in the upper Rio Grande, and the river became the spine of Spanish colonization across what is now the American Southwest. The Pueblo Revolt of 1680 drove the Spanish south from New Mexico; the refugees established Ysleta Mission that same year, now the oldest continuously active parish in Texas.

The towns that followed made the river a lifeline. Rio Grande City, the seat of Starr County and one of the oldest settlements in South Texas, sits on the water exactly 100 miles from both Brownsville and Laredo. The watershed was logged from the 1830s through the 1920s to feed the regional timber industry and the railroad expansion of the 1860s through the 1910s, until the old-growth stands were exhausted around 1910 and state forestry conservation, beginning in 1915, brought large-scale cutting to an end. Systematic hydrology arrived with the USGS surveys of the 1870s through the 1890s and the gauging stations established between the 1880s and the 1910s — the first comprehensive measurements of the river's flow. Later Clean Water Act assessments from 1972 onward, and modern TMDL programs, took up the accumulated century of logging, agricultural, and industrial impacts.

Today the National Park Service manages the Texas Rio Grande as a National Wild & Scenic River. Its canyon runs read like a route card: Mariscal Canyon, San Vincente & Hot Springs Canyon, Boquillas Canyon, and the remote Lower Canyons. Since 2010, Texas DNR and local watershed partnerships have pursued streambank stabilization (2015–2024), native fish restocking (2017–2024), a nutrient reduction strategy (2018–2024), and water-quality improvements (2020–2024). The river's oldest fight, meanwhile, reached a truce: on May 27, 2026, the U.S. Supreme Court accepted a settlement ending the more than decade-long dispute among Texas, New Mexico, and the federal government over how the Rio Grande's water should be divided. From a conquistador's claim to a courtroom resolution, the river endures as the contested, indispensable artery of the borderlands it has shaped for more than four hundred years.