An Invisible Bridge spans a broad half-mile deep valley that separates the Charmbridge Academy from the Muggle world. The span is reinforced with stabilization and windbreaker charms, and "is charmed against wind, rain, snow, and other weather conditions."

In September 2007, the bridge suffered a catastrophic failure, allowing Alexandra Quick and David Washington to plummet toward the valley floor.

In September 2010, Quick deliberately leaped from the bridge with her broom after being attacked by an ensorcelled murder of crows.