U.S. Route 611 Alternate (US 611 Alt.) was an alternate alignment of US 611 that ran between Portland and Stroudsburg across the Delaware Water Gap. US 611 Alt. began at Portland in Northampton County, where US 611 crossed the Portland-Columbia Toll Bridge into New Jersey. From here, it headed north on the west bank of the Delaware River, passing through Slateford. The route traversed the Delaware Water Gap into Monroe County and continued to the community of Delaware Water Gap. Here, US 611 Alt. reached its northern terminus at an intersection with US 611 at Foxtown Hill Road. US 611 Alt. was designated during the 1950s on the former alignment of US 611 when US 611 was realigned to use a new alignment across the river in New Jersey, crossing the Delaware River twice on the Portland-Columbia Toll Bridge and the Delaware Water Gap Toll Bridge. In 1963, the Pennsylvania Highways Department recommended replacing US 611 Alt. with US 611, with the US 611 designation to be removed from I-80. US 611 Alt. was replaced by US 611 in 1965 when it was rerouted out of New Jersey. I-80 had replaced the alignment of US 611 in New Jersey.