Attoyac Bayou and Bacterial Source Tracking

The Attoyac Bayou, a sub-watershed within the Upper Neches River Watershed, extends approximately 82 miles through Rusk, Nacogdoches, San Augustine and Shelby counties before emptying into Sam Rayburn Reservoir. With several rural communities in the area, the majority of the land in the watershed is used for cattle and poultry operations, forestry or recreational and wildlife uses.

The bayou is one of many rural watersheds listed as an impaired water body on the Texas Integrated Report for Clean Water Act. Sections 305(b) and 303(d) note high levels of E. coli, the non-pathogenic indicator bacteria. Three monitoring stations managed by the Angelina & Neches River Authority, U.S. Geological Survey, and Texas Commission on Environmental Quality have provided water quality data on the bayou for a number of years. Beginning in 2000, data collected for E. coli have consistently shown elevated E. coli levels that exceed the Texas Water Quality Standards.

Attoyac Bayou Watershed Partnership

Fact Sheet (PDF)



Bacterial Source Tracking

Bacterial source tracking is a tool for determining the impact of humans and animals on water quality.  It helps identify the sources of bacteria pollution entering a watershed.  It is also used to determine where targeted control efforts would be the most beneficial. Bacterial source tracking has been used in Buck Creek, Leon River, San Antonio River, Bosque River, and other rivers and creeks.


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