US Bridges

Main St. (cr 684) over Conrail(abandoned)

Poor

Middlesex County, New Jersey · 150 Ft North of Rt 9 Entr · Structure no. 1207151

Built
1909
116 years old, rebuilt 1930
Condition
Poor
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
33 ft
1 main span
Daily traffic
8,450
2022 count
Owner
State
State Highway Agency

About this bridge

Main St. (cr 684) over Conrail(abandoned) is a steel stringer/multi-beam or girder carrying Main St. (cr 684) over Conrail(abandoned) in Middlesex County, New Jersey. It was built in 1909 and reconstructed in 1930, so it is 116 years old, older than the New Jersey average of 58.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 8,450 vehicles a day, roughly 4% of them trucks, projected to reach 10,300 by 2042. The structure is 33 ft (10.1 m) long and 69 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesMain St. (cr 684)
CrossesConrail(abandoned)
Location150 Ft North of Rt 9 Entr
RouteCounty Highway 684
Coordinates40.47843, -74.29024
Functional classUrban Minor Arterial

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating69 US tons
Inventory rating41 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length33 ft (10.1 m)
Longest span30 ft (9.1 m)
Deck width69 ft (21 m)
Roadway width50 ft (15.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,450 (2022)
Projected traffic10,300 by 2042
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesOther
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Main St. (cr 684) over Conrail(abandoned) built?

It was built in 1909, making it 116 years old in 2025. It was reconstructed in 1930.

What condition is Main St. (cr 684) over Conrail(abandoned) in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in August 2024.

How much traffic does Main St. (cr 684) over Conrail(abandoned) carry?

About 8,450 vehicles per day (2022 count), of which roughly 4% are trucks.

How long is Main St. (cr 684) over Conrail(abandoned)?

The structure is 33 ft (10.1 m) long with a longest span of 30 ft (9.1 m) and a deck 69 ft wide.

Who owns Main St. (cr 684) over Conrail(abandoned)?

It is owned by the State Highway Agency.