Blair Gap Run is a 28 square mile watershed located primarily in southwest Blair County. A small section of the watershed lies within Cambria County to the west. The watershed contains parts of State Game Lands 198 and land owned by the US National Parks Service (associated with the Portage National Railroad and the Lemon House). 30% of Juniata Township, 40% of Allegheny Township, and all of Duncansville Borough are located with the watershed. The Blair Gap Run Watershed also crosses small sections of Blair Township and Freedom Township. Forest is the primary land use and covers approximately 75% of the watershed.
Tributaries to Blair Gap Run include Redlick Run, Adams Run, Gillans Run, and Dry Run. Blair Gap Run flows east until it meets the Beaverdam Branch.
Drinking Water Supplies in this Watershed
Three reservoirs are located in the Blair Gap Run Watershed. The Blair Gap and Plane 9 reservoirs are fed by Blair Gap Run. A third reservoir in the same vicinity, the Muleshoe, is fed by Adams Run and Blair Run. These reservoirs are operated by the Hollidaysburg Borough Authority and the Altoona Water Authority, which provides clean drinking water to thousands of people in Blair County. Click here to learn more about Blair County Drinking Water and what your role is in preventing drinking water pollution.