Pennypack Creek is a tidal tributary of the Delaware River Estuary, flowing through Montgomery and Philadelphia Counties in southeastern Pennsylvania. The creek transitions from a freshwater stream in its upper reaches to a tidal estuary as it approaches its confluence with the Delaware River near Torresdale Avenue. It is a heavily utilized urban fishery, managed primarily as a put-and-take trout stream with a diverse mix of both freshwater and tidal species. The creek is bordered by significant greenways, including Lorimer Park and Pennypack Park, which provide extensive public access via a network of trails and parking areas.