US Bridges

Nj 29 and Ramp B over Ramp D

Fair

Mercer County, New Jersey · 0.5 MI N of US 1 JCT · Structure no. 1131152

Built
1969
56 years old
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
79 ft
1 main span
Daily traffic
48,223
2024 count
Owner
State
State Highway Agency

About this bridge

Nj 29 and Ramp B over Ramp D is a steel stringer/multi-beam or girder carrying Nj 29 and Ramp B over Ramp D in Mercer County, New Jersey. It was built in 1969, so it is 56 years old, younger than the New Jersey average of 58.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 48,223 vehicles a day, roughly 5% of them trucks, projected to reach 57,867 by 2044. The structure is 79 ft (24.1 m) long and 126 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesNj 29 and Ramp B
CrossesRamp D
Location0.5 MI N of US 1 JCT
RouteState Highway 29
CountyMercer County
StateNew Jersey
Coordinates40.21623, -74.76916
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating60 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length79 ft (24.1 m)
Longest span79 ft (24.1 m)
Deck width126 ft (38.4 m)
Roadway width98 ft (29.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic48,223 (2024)
Projected traffic57,867 by 2044
Trucks5%
Lanes on structure7
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$1,000 (2024 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Nj 29 and Ramp B over Ramp D built?

It was built in 1969, making it 56 years old in 2025.

What condition is Nj 29 and Ramp B over Ramp D in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in May 2024.

How much traffic does Nj 29 and Ramp B over Ramp D carry?

About 48,223 vehicles per day (2024 count), of which roughly 5% are trucks.

How long is Nj 29 and Ramp B over Ramp D?

The structure is 79 ft (24.1 m) long with a longest span of 79 ft (24.1 m) and a deck 126 ft wide.

Who owns Nj 29 and Ramp B over Ramp D?

It is owned by the State Highway Agency.