Cow Bridge Branch is a long third-order tributary to Millsboro Pond in Sussex County, Delaware. This is the only stream of this name in the United States.
According to the Geographic Names Information System, it has also been known historically as:
Cow Bridge Branch begins at the outlet of Morris Millpond at Morris Mill, Delaware, where Deep Branch and Gills Branch join. Cow Bridge Branch then flows south-southeast to Millsboro Pond.
Cow Bridge Branch drains of area, receives about 45.1 in/year of precipitation, and is about 23.07% forested.