County Route 518 (New Jersey)

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County Route 518

CR 518 highlighted in red
Route information
Length20.58 mi[1] (33.12 km)
ExistedJanuary 1, 1953[2][3]–present
Millstone Valley Scenic Byway
Major junctions
West end Route 29 / Route 165 in Lambertville
Major intersections
East end Route 27 in Franklin Township
CountryUnited States
StateNew Jersey
CountiesHunterdon, Mercer, Somerset
Highway system
CR 517 CR 519

County Route 518 (CR 518) is a county highway in the U.S. state of New Jersey. The highway extends 20.58 miles (33.12 km) from Route 29/Route 165 in Lambertville to Lincoln Highway (Route 27) in Franklin Township. It is also known as the Georgetown Franklin Turnpike.

Route description

Typical section of CR 518 in Hopewell Township, Mercer County

CR 518 begins at an intersection with Route 29/Route 165 in Lambertville, Hunterdon County, heading east on two-lane undivided Brunswick Avenue. The road climbs in elevation heading east through wooded residential areas before turning southeast and crossing into West Amwell Township and becoming Brunswick Pike. The route winds east through forested areas with some homes before entering a mix of farmland, woods, and residences. CR 518 turns northeast and enters Hopewell Township in Mercer County and immediately intersects CR 601 before coming to the CR 579 junction. At this intersection, the road becomes Lambertville-Hopewell Road and continues east, intersecting CR 612 in Woodsville and Route 31.[1][4]

At the intersection with the latter, CR 518 runs east along the border between East Amwell Township, Hunterdon County to the north and Hopwell Township, Mercer County to the south, passing through wooded areas as it crosses fully into Hopewell Township again. CR 518 ascends and descends a spur of the Sourland Mountains before continuing into Hopewell Borough, where it becomes Louellen Street and crosses CSX's Trenton Subdivision before heading into residential areas. At the intersection with CR 654, the route turns east onto Broad Street and passes homes and businesses, intersecting the northern terminus of CR 569 (Princeton Avenue). The road leaves Hopewell Borough for Hopewell Township again, heading northeast into agricultural areas.[1][4]

At Stoutsburg, CR 518 crosses the Keith line and continues into Montgomery Township, Somerset County, passing farms, woods, and residential subdivisions. The road crosses CR 601, at which point it turns to the east and continues to an intersection with US 206/CR 533 a short distance north of Princeton Airport in a commercial area. East of US 206/CR 533, the route enters Rocky Hill, where the name becomes Washington Street, and passes wooded residential areas, intersecting CR 605 in the center of the community. From this point, CR 518 enters woodland and crosses the Millstone River, where it enters Franklin Township and becomes Georgetown-Franklin Turnpike. Immediately following the Millstone River, the road crosses the Delaware and Raritan Canal and reaches the CR 603 intersection. The route ascends Ten Mile Run Mountain and passes through more forests to the north of a quarry, climbing a steep hill, and curves to the northeast, flattening out into a mix of farms, woods, and homes. CR 518 reaches its eastern terminus at an intersection with Route 27 (though which the border between Franklin Township, Somerset County and South Brunswick, Middlesex County runs).[1][4]


The entirety of this road was created as part of the Georgetown and Franklin Turnpike, incorporated in 1816 to run from New Brunswick to the Delaware River at Lambertville. Also included in this turnpike is what is now Route 27 to New Brunswick.

Westbound CR 518 in Hopewell. CR 654 (former CR 518 Spur) southbound begins ahead while CR 518 turns right.

A spur route, County Route 518 Spur, existed, which is now Mercer County Route 654.[5]

Beginning in 2014, Somerset County began reconstruction of a steep, winding section of CR 518 in Franklin Township to reduce the potential for accidents and improve the quality of the road in the area.[6] The $4.6-million project involves blasting into a hillside to allow for a realigned section of roadway and the addition of storm sewers and shoulders.[7] Final completion of the project occurred in August 2015.[8]

Major intersections

HunterdonLambertville0.000.00 Route 29 / Route 165
MercerHopewell Township5.488.82 CR 579 (Harbourton-Rocktown Road)
7.2111.60 Route 31 – Flemington, Trenton
CR 569 south (Princeton Avenue)
Northern terminus of CR 569
SomersetMontgomery Township16.6426.78 US 206 (CR 533) – Somerville, Princeton
Franklin Township20.5833.12 Route 27 – New Brunswick, Princeton
1.000 mi = 1.609 km; 1.000 km = 0.621 mi


  1. ^ a b c d e "County Route 518 straight line diagram" (PDF). Trenton, New Jersey: New Jersey Department of Transportation. 2009. Retrieved January 5, 2011.
  2. ^ "Somerset Road Links Charted for Emergency". The Sunday Times. New Brunswick, New Jersey. March 22, 1953. p. 8. Retrieved January 17, 2021 – via
  3. ^ "State Ready to Push Traffic Off Major Roads in Air Raid". The Sunday Times. New Brunswick, New Jersey. March 15, 1953. pp. 1, 39. Retrieved January 17, 2021 – via
  4. ^ a b c Google (December 31, 2010). "overview of County Route 518" (Map). Google Maps. Google. Retrieved December 31, 2010.
  5. ^ Highway & Facilities Map of Mercer County, New Jersey (Map). Donald T. Harney, County Engineer. 1976. Retrieved October 18, 2015.
  6. ^ O'Brien, Walter (September 24, 2014). "Section of Route 518 in Franklin to close for repairs through 2015". Retrieved September 10, 2015.
  7. ^ "Engineering - Route 518 Project". Somerset County, NJ. Archived from the original on 2016-03-05. Retrieved September 10, 2015.
  8. ^ "Somerset County Detours and Construction Projects, August 14, 2015" (PDF). Somerset County. August 14, 2015. Retrieved October 18, 2015. Georgetown/Franklin Turnpike (CR 518) between Canal Road and Carroll Place, Franklin Township: Final surface paving operations will be underway on August 19, 20, 21.[permanent dead link]

External links