State Highways of New Jersey

The original legislation establishing the highway called for it to run “From Trenton to Lambertville, then through Ringoes, Somerville, Bound Brook, North Plainfield, Union, to NJ 25 in Newark.” The section between Lambertville and Ringoes, part of the Old York Road, became part of US 202 and remained so designated until a new toll bridge was built between Lambertville and New Hope, at which time the old highway became NJ 179. NJ 29 was supposed to continue along Old York Road between Ringoes and Somerville; that highway was never taken over by the state (except for the part that is NJ 179) and remains under county jurisdiction. Instead, NJ 29 duplicated NJ 30 (now NJ 31) to Flemington and then used the highway that is now US 202 from Flemington to Raritan, originally supposed to be part of NJ 12. That section of highway was open by 1935. NJ 29 between Bridgewater and Newark became part of US 22 as soon as it was complete, in the late 1930s.

When the State Highway Commission eliminated most concurrent routings of state and US highways in 1953, NJ 29 was truncated to Old York Road in Lambertville. Separately, the highway received two extensions. One was up the Delaware River to NJ 12 in Frenchtown, although the last half-mile or so of the highway in Frenchtown is controlled by Hunterdon County (as is the section of NJ 12 in Frenchtown). The other is a freeway extension on the south end of Trenton, through a tunnel that opened in the early 2000s, beyond NJ 129 all the way to I-295. The highway then continues eastward as I-195 and eventually NJ 138, ending at NJ 35 on the border of Wall and Belmar.

For a number of years, NJ 29 in Lambertville followed Main Street all the way through. However, Main Street is narrow, particularly so south of Bridge Street. As a result, the state legislated NJ 165 over River Road to carry northbound traffic in that quarter-mile section. Recently, jurisdiction over Main Street was turned back to the City of Lambertville, and traffic on NJ 29 in both directions utilizes River Road now. As a result, while NJ 165 still exists, it is now completely overlaid by NJ 29 and is therefore unmarked.

Mile	Street Name	Feature
34.71	Northern terminus of , Frenchtown Boro, Hunterdon Co
34.71	Trenton Rd	Bridge St		Race St
34.54	Trenton Rd	Nishiskawick Creek	culvert	Nishiskawick Creek
34.48	Trenton Rd	Little Nishiskawick Creek	culvert	Little Nishiskawick Creek
34.26	Trenton Rd	Hunterdon Co jurisdiction NJDOT jurisdiction
34.00		Frenchtown Boro, Hunterdon Co Kingwood Twp, Hunterdon Co
33.19		Copper Creek	bridge	Copper Creek
32.11		Branch Delaware River	bridge	Branch Delaware River
30.75		Warford Creed Creek	culvert	Warford Creed Creek
29.87		Cains Run Creek	culvert	Cains Run Creek
26.84				Byram Kingwood Rd
26.24		Kingwood Twp, Hunterdon Co Delaware Twp, Hunterdon Co
25.77		D&R Canal Park entrance		Quarry Rd
24.58		Lockatong Creek	bridge	Lockatong Creek
23.03				Kingwood-Stockton Rd
23.00		Delaware Twp, Hunterdon Co Stockton Boro, Hunterdon Co
23.00		Wickacheoke Creek	bridge	Wickacheoke Creek
22.48	Main St	Ferry St
21.72		Stockton Boro, Hunterdon Co Delaware Twp, Hunterdon Co
21.69		Brookville Creek	culvert	Brookville Creek
20.73		Black River & Western Railroad	at grade	Black River & Western Railroad
20.06			underpass
19.98		Black River & Western Railroad	at grade	Black River & Western Railroad
19.96		Delaware Twp, Hunterdon Co Lambertville City, Hunterdon Co
19.96		Alexauken Creek	culvert	Alexauken Creek
18.89	Main St	Bridge St
18.84	Bridge St			Old York Rd
18.77	River Rd			Brunswick St
18.74	River Rd	Swan Creek	bridge	Swan Creek
18.07	River Rd	Lambertville City, Hunterdon Co West Amwell Twp, Hunterdon Co
17.01	River Rd	West Amwell Twp, Hunterdon Co Hopewell Twp, Mercer Co
15.34	River Rd	Moores Creek	bridge	Moores Creek
13.35	River Rd	Fiddlers Creek	bridge	Fiddlers Creek
13.10	River Rd	Church Rd		Church Rd
12.34	River Rd	Unnamed stream	bridge	Unnamed stream
12.03	River Rd	Pedestrian crossing	underpass	Pedestrian crossing
11.95	River Rd	Washington Crossing Rd		Washington Crossing Rd
10.51	River Rd	Hopewell Twp, Mercer Co Ewing Twp, Mercer Co
10.51	River Rd	Jacobs Creek	bridge	Jacobs Creek
10.45	River Rd			Jacobs Creek Rd
9.55		Upper River Rd		Bernard Dr
9.42		Upper River Rd	bridge	Upper River Rd
9.40		Delaware & Raritan Canal	bridge	Delaware & Raritan Canal
9.13		Delaware Expwy	underpass	Delaware Expwy
8.49				Upper Ferry Rd, to
7.32		Railroad	underpass	Railroad
7.29				Lower Ferry Rd
7.23		Gold Creek	bridge	Gold Creek
6.93		Ewing Twp, Mercer Co Trenton City, Mercer Co
6.74	John Fitch Way			Sanhican Dr
6.18	John Fitch Way	Mount Vernon Ave		Sullivan Way
6.12	John Fitch Way			State St
5.90	John Fitch Way	Lee Ave		Lee Ave
5.59	John Fitch Way	Pedestrian crossing	underpass	Pedestrian crossing
5.45	John Fitch Way		overpass	Parkside Ave
4.34	John Fitch Way	Calhoun St	underpass	Calhoun St
3.98	John Fitch Way		overpass	Warren St
3.90	John Fitch Way	Assunpink Creek	bridge	Assunpink Creek
3.84	John Fitch Way		overpass	State capitol complex
3.63	John Fitch Way		overpass	Market St
3.49	John Fitch Way	Ramp to	underpass	Ramp to
3.42	John Fitch Way	Bridge St	underpass	Bridge St
3.37	John Fitch Way	Trenton Freeway	underpass	Trenton Freeway
3.22	John Fitch Way	Office complex entrance		Warren St
2.94	John Fitch Way	Office/ballpark entrance		Cass St
2.56			tunnel	Lalor St
1.77		Trenton City, Mercer Co Hamilton Twp, Mercer Co
1.76			overpass
1.74		NJ Transit River LINE	overpass	NJ Transit River LINE
0.39		Watsons Creek	bridge	Watsons Creek
0.00			underpass
0.00	Southern terminus of , Hamilton Twp, Mercer Co
	Road continues eastward as