Route 57 is a state highway located in Warren County in the U.S. state of New Jersey. It runs 21.10 mi (33.96 km) from an interchange with U.S. Route 22 (US 22) in Lopatcong Township to an intersection with Route 182 and County Route 517 (CR 517) in Hackettstown. The route passes through mostly rural areas of farmland and mountains in Warren County. It also passes through Washington, where Route 57 crosses Route 31. The route is designated a scenic byway, the Warren Heritage Scenic Byway, by the state of New Jersey due to the physical environments it passes through as well as from historical sites along the way such as the Morris Canal.
The current alignment of Route 57 was designated as a part of pre-1927 Route 12 in 1917. In 1927, Route 24 was designated along this route between the Phillipsburg area and Penwell in Mansfield Township while a spur of Route 24 called Route S24 replaced pre-1927 Route 12 between Penwell and US 46 in Hackettstown. When New Jersey renumbered its state highways in 1953, the portion of Route S24 between Penwell and CR 517 in Hackettstown became a part of Route 24 to complete a gap in that route while Route S24 north of there became Route 57. A never-built segment of Route 57 running from the intersection of Route 24 and Route 57 to US 46 east of Hackettstown was legislated in 1965. Around 1970, Route 57 was designated along Route 24 west of Hackettstown while the portion of Route 57 in Hackettstown became Route 182.
^"Route 57 straight line diagram" (PDF). New Jersey Department of Transportation. Retrieved March 17, 2020.
^"New Route Markers Go Up Next Month" (PDF). The Hackettstown Gazette. December 18, 1952. p. 17. Retrieved September 26, 2018.
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