Blanco River (Texas)
Location of the Blanco River in central Texas
|Origin||Kendall County, Texas, U.S.A|
|Mouth||San Marcos River, Hays County, Texas, U.S.A.|
|Length||87 miles (140 km)|
|Source elevation||1,607 feet (490 m)|
|Avg. discharge||93 ft³/s (3 m³/s)|
|Basin area||412 square miles (1,067 km2)|
The primary source for the river is a series of springs in northern Kendall County. The river flows generally eastward for 87 miles (140 km) through Kendall County, Blanco County and Hays County. Near San Marcos, it takes a southerly turn and joins with the San Marcos River.
The river is generally quite shallow, and it briefly dips below ground in some areas in the Hill Country. As with many of the rivers in the Texas Hill Country, there is great variability in the Blanco River's flow. The mean flow is 93 ft³/s (3 m³/s), but heavy rains in the river's watershed can cause flash flooding with little warning.
In 1998 the Blanco River had peak flooding discharge of 2,970 m3 /s from a 1,067 km2 basin.
Early in the morning on May 24th, during the 2015 Texas–Oklahoma floods, the Blanco River caused severe flooding. The river at Wimberley rose more than 30 feet in less than three hours, and set a new record high crest of more than 40 feet while disabling the gauge.
The upper reaches of the Blanco River are hilly, and the river's slopes are frequently steep. As the river reaches the Balcones Escarpment near San Marcos, it widens and its slopes moderate; this is typical of rivers in the central part of the state.
The Blanco River provides drinking water for the city of Blanco, as well as water supplies for nearby ranches. The river also supports a number of recreational areas, including the Blanco State Recreation Area in Blanco, the Boy Scouts camp El Rancho Cima near Wimberley, and other private parks and resorts.
- Richard A. Earl (2007). "The October 1998 flood of the upper Guadalupe River system, Central Texas". Texas State University.
- Blanco River from the Handbook of Texas Online
- The Narrows (of the Blanco River) from the Handbook of Texas Online
- Pull: Texas Canoe trip Video of a canoe trip down the river with winching.