US Bridges

Monmouth ST over Assunpink Creek

Fair

Mercer County, New Jersey · 0.1 MI West of E State ST · Structure no. 1100054

Built
1938
87 years old, rebuilt 2020
Condition
Fair
inspected February 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
70 ft
1 main span
Daily traffic
2,130
2023 count
Owner
County
County Highway Agency

About this bridge

Monmouth ST over Assunpink Creek is a steel stringer/multi-beam or girder carrying Monmouth ST over Assunpink Creek in Mercer County, New Jersey. It was built in 1938 and reconstructed in 2020, so it is 87 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 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 2,130 vehicles a day, roughly 3% of them trucks, projected to reach 2,595 by 2043. The structure is 70 ft (21.3 m) long and 50 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesMonmouth ST
CrossesAssunpink Creek
Location0.1 MI West of E State ST
RouteCity Street 0
CountyMercer County
StateNew Jersey
Coordinates40.22277, -74.75094
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
Deck8 Very GoodNo problems noted.
Superstructure9 ExcellentNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating106.8 US tons
Inventory rating101.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length70 ft (21.3 m)
Longest span68 ft (20.7 m)
Deck width50 ft (15.1 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,130 (2023)
Projected traffic2,595 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedDeck replacement with only incidental widening
Estimated improvement cost$1.1 million (2019 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Monmouth ST over Assunpink Creek built?

It was built in 1938, making it 87 years old in 2025. It was reconstructed in 2020.

What condition is Monmouth ST over Assunpink Creek 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 February 2023.

How much traffic does Monmouth ST over Assunpink Creek carry?

About 2,130 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Monmouth ST over Assunpink Creek?

The structure is 70 ft (21.3 m) long with a longest span of 68 ft (20.7 m) and a deck 50 ft wide.

Who owns Monmouth ST over Assunpink Creek?

It is owned by the County Highway Agency.