A community history map of the Swisshelm Park neighborhood of Pittsburgh (with Duck Hollow and the Nine Mile Run valley), 1800s–today. Sources and credits: see the
project page. Next door: the
Frick Park History Map. Photos (
●), events (
◆), street histories (
━), lost roads (
╍), the old city line (
┈), and census residents (
●) for Swisshelm Park, Duck Hollow, and Nine Mile Run. Photo spots and some event spots are estimates; click any item for its confidence and source. Plats are georeferenced by matching street corners (typical error 5–15 m); USGS topos use their own coordinates (a few meters); the 1938 aerial is a single tilted photo (20–50 m error at the edges).