US Bridges

Montgomery Road over Neshanic River

Fair

Somerset County, New Jersey · 0.4 Mi. S. of Amwell Rd. · Structure no. 18B0505

Built
1928
97 years old, rebuilt 2008
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
104 ft
2 main spans
Daily traffic
1,113
2023 count
Owner
County
County Highway Agency

About this bridge

Montgomery Road over Neshanic River is a steel stringer/multi-beam or girder carrying Montgomery Road over Neshanic River in Somerset County, New Jersey. It was built in 1928 and reconstructed in 2008, so it is 97 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 1,113 vehicles a day, roughly 3% of them trucks, projected to reach 1,336 by 2043. The structure is 104 ft (31.7 m) long and 28 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesMontgomery Road
CrossesNeshanic River
Location0.4 Mi. S. of Amwell Rd.
CountySomerset County
StateNew Jersey
Coordinates40.48782, -74.75603
Functional classRural Local

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating61 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckClosed grating
Main spans2
Design loadH 20
Structure length104 ft (31.7 m)
Longest span49 ft (14.9 m)
Deck width28 ft (8.6 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,113 (2023)
Projected traffic1,336 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost$308,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Montgomery Road over Neshanic River built?

It was built in 1928, making it 97 years old in 2025. It was reconstructed in 2008.

What condition is Montgomery Road over Neshanic River 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 September 2023.

How much traffic does Montgomery Road over Neshanic River carry?

About 1,113 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Montgomery Road over Neshanic River?

The structure is 104 ft (31.7 m) long with a longest span of 49 ft (14.9 m) and a deck 28 ft wide.

Who owns Montgomery Road over Neshanic River?

It is owned by the County Highway Agency.