McPherson Ridge is a landform used for military engagements during the 1863 Battle of Gettysburg, First Day, when the I Corps (Union Army) had a headquarters on the ridge and was defeated by the Confederate division of Major General Henry Heth. The ridge has terrain above ~530 ft and is almost entirely a federally protected area except for township portions at the southern end and along Pennsylvania Route 116, including a PennDOT facility.