Fall raptor flights have been known to occur on Tussey Mountain for many years, with the former fire tower near Pennsylvania Furnace Rd (5 miles southwest of the spring site) being a popular watch site (see Merrill Wood's classic Birds of Pennsylvania), as well as the Colerain Road near Spruce Creek. Part-time spring counts were begun by David Brandes in March 1995 and continued through 2000 with the help of Dan Ombalski, Nick Bolgiano, Chuck Widmann and other local die-hards. Full-time counts have been conducted from late Feb through April since 2001. Although conventional wisdom maintained that raptors do not follow ridges in the spring, we learned quickly that this did not apply to early season golden eagles.
Summary data can be found at HawkCount