The Barker Reservoir watershed encompasses the area that drains into Barker Reservoir. This reservoir, together with Addicks Reservoir, was created as part of a federal project to control flooding on Buffalo Bayou and protect downtown Houston. The U.S. Army Corps of Engineers (the Corps) completed construction of the Barker Dam and outlet facility in 1945 and continues to own, operate and maintain the dam and outlet facilities. The watershed is located in west Harris County and extends into Fort Bend and Waller counties, encompassing portions of the cities of Houston and Katy. The Barker Reservoir watershed covers approximately 126 square miles and includes two primary streams: Mason Creek and Upper Buffalo Bayou. There are about 47 miles of open streams within the watershed, including the primary streams and tributary channels. Based on the 2010 U.S. Census, the estimated population of the Harris County portion of the Barker Reservoir watershed is 88,895.