US Bridges

Old Forge Road over Manalapan Brook

Fair

Middlesex County, New Jersey · 0.39 MI So. of Main ST · Structure no. 125B101

Built
1986
39 years old
Condition
Fair
inspected April 2023
Type
Slab
Prestressed Concrete
Length
51 ft
1 main span
Daily traffic
3,171
2023 count
Owner
County
County Highway Agency

About this bridge

Old Forge Road over Manalapan Brook is a prestressed concrete slab carrying Old Forge Road over Manalapan Brook in Middlesex County, New Jersey. It was built in 1986, so it is 39 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 6 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 3,171 vehicles a day, roughly 3% of them trucks, projected to reach 3,869 by 2043. The structure is 51 ft (15.5 m) long and 52 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesOld Forge Road
CrossesManalapan Brook
Location0.39 MI So. of Main ST
RouteCity Street 0
CountyMiddlesex County
StateNew Jersey
Coordinates40.37481, -74.41539
Functional classUrban Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating86 US tons
Inventory rating51 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length51 ft (15.5 m)
Longest span47 ft (14.3 m)
Deck width52 ft (15.7 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,171 (2023)
Projected traffic3,869 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Old Forge Road over Manalapan Brook built?

It was built in 1986, making it 39 years old in 2025.

What condition is Old Forge Road over Manalapan Brook 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 April 2023.

How much traffic does Old Forge Road over Manalapan Brook carry?

About 3,171 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Old Forge Road over Manalapan Brook?

The structure is 51 ft (15.5 m) long with a longest span of 47 ft (14.3 m) and a deck 52 ft wide.

Who owns Old Forge Road over Manalapan Brook?

It is owned by the County Highway Agency.