US Bridges

Dayton Road over Walnut Brook

Fair

Hunterdon County, New Jersey · 0.1 Mi.W.Of S. Main ST · Structure no. 1000129

Built
1900
125 years old, rebuilt 1962
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
31 ft
1 main span
Daily traffic
778
2023 count
Owner
County
County Highway Agency

About this bridge

Dayton Road over Walnut Brook is a steel stringer/multi-beam or girder carrying Dayton Road over Walnut Brook in Hunterdon County, New Jersey. It was built in 1900 and reconstructed in 1962, so it is 125 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 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 778 vehicles a day, roughly 1% of them trucks, projected to reach 949 by 2043. The structure is 31 ft (9.4 m) long and 25 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesDayton Road
CrossesWalnut Brook
Location0.1 Mi.W.Of S. Main ST
RouteCity Street 0
CountyHunterdon County
StateNew Jersey
Coordinates40.49394, -74.86473
Functional classUrban 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
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 rating57 US tons
Inventory rating34 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckOpen grating
Main spans1
Design loadHS 20
Structure length31 ft (9.4 m)
Longest span28 ft (8.5 m)
Deck width25 ft (7.6 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic778 (2023)
Projected traffic949 by 2043
Trucks1%
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$147,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Dayton Road over Walnut Brook built?

It was built in 1900, making it 125 years old in 2025. It was reconstructed in 1962.

What condition is Dayton Road over Walnut 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 Dayton Road over Walnut Brook carry?

About 778 vehicles per day (2023 count), of which roughly 1% are trucks.

How long is Dayton Road over Walnut Brook?

The structure is 31 ft (9.4 m) long with a longest span of 28 ft (8.5 m) and a deck 25 ft wide.

Who owns Dayton Road over Walnut Brook?

It is owned by the County Highway Agency.