From the junction of the two forks, the main stream flows south the entire length of
Washington and
Upper Mt. Bethel townships, passing through the boroughs of
Roseto and
Bangor, an area heavily marked by
slate quarries. A former
DL&W rail line, now operated by
Norfolk Southern, follows it south from Bangor, where it passes through
Flicksville and meets Greenwalk Creek just below Martins Creek Junction at the abandoned DL&W line, and runs northwest to
Pen Argyl. The creek valley then becomes wide, steep, and then increasingly narrow and twisty as it flows further south and meets Little Martins Creek. At the town of
Martins Creek, the DL&W line connects to the former
PRR Martins Creek Branch (now also Norfolk Southern), and
PA Route 611 crosses the creek and runs along it before continuing south along the Delaware River. The creek passes the former Alpha Portland Cement plant, the major industry in the town, and empties into the Delaware River. ==Tributaries==