Wallace Run is a tributary of Bald Eagle Creek in Centre County, Pennsylvania, in the United States. It is long and is a low-alkalinity stream. The stream flows through Union Township and Boggs Township in Centre County. Most of the watershed is in Boggs Township. The North Branch of Wallace Run is one tributary of the stream. The watershed has an area of . Oaks, maples, ash trees, birches, hemlocks, and rhododendrons all exist in the upper reaches of the stream, which is mostly forested. The lower reaches of the stream are mostly developed. Course Wallace Run begins in a valley in the Pennsylvania State Game Lands Number 163 in western Union Township. The headwaters are situated on the southern side of the Allegheny Plateau. Foxy Hollow is to the south of the headwaters and Bear Knob is to the east. The stream flows northeast past Dry Hollow and picks up Rock Cabin Run on the left. The stream continues northeast, passing Grindstone Gap on the right and picking up Birch Lick Run on the left. After this, the creek flows around Ganderstep Knob, picking up its north branch. It turns southeast and exits the township. Wallace Run then enters Boggs Township and its valley becomes shallower. The stream passes Gum Stump and begins to parallel Pennsylvania Route 144 for several miles to its mouth, passing the community of Runville along the way. Wallace Run enters Bald Eagle Creek at the community of Wingate, a short distance upstream of Milesburg. Tributaries Wallace Run's North Branch begins near the edge of Boggs Township, just south of Pennsylvania Route 144. It flows southwest a short distance into Union Township, where it joins the main stem. Hydrology The concentration of alkalinity in Wallace Run near its source is 10 parts per million. Near its mouth, the concentration is 28 parts per million. At an unnamed tributary of Wallace Run downstream of Gum Stump, the pH was measured in 2008 to be 7.9 and 8.0 and the conductivity was 387 and 390 micro-siemens. In August 2008, the water temperature was in the lower reaches of the creek and two miles (three kilometers) upstream. In 2009, before a storm, the size of particles in Wallace Run was measured. 10% had a diameter of less than one millimeter, about one third had a diameter of less than one centimeter, and over 90% had a diameter of