US Bridges

Jackson Avenue over Peapack Brook

Fair

Somerset County, New Jersey · At Main ST Intersection · Structure no. 18D1304

Built
1920
105 years old, rebuilt 1982
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
36 ft
1 main span
Daily traffic
1,483
2023 count
Owner
County
County Highway Agency

About this bridge

Jackson Avenue over Peapack Brook is a wood or timber stringer/multi-beam or girder carrying Jackson Avenue over Peapack Brook in Somerset County, New Jersey. It was built in 1920 and reconstructed in 1982, so it is 105 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 1,483 vehicles a day, roughly 3% of them trucks, projected to reach 1,779 by 2043. The structure is 36 ft (11 m) long and 31 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesJackson Avenue
CrossesPeapack Brook
LocationAt Main ST Intersection
RouteCounty Highway 628
CountySomerset County
StateNew Jersey
Coordinates40.72485, -74.66801
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating32 US tons
Inventory rating21.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadHS 20
Structure length36 ft (11 m)
Longest span32 ft (9.8 m)
Deck width31 ft (9.5 m)
Roadway width29 ft (8.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,483 (2023)
Projected traffic1,779 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 statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Jackson Avenue over Peapack Brook built?

It was built in 1920, making it 105 years old in 2025. It was reconstructed in 1982.

What condition is Jackson Avenue over Peapack 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 October 2023.

How much traffic does Jackson Avenue over Peapack Brook carry?

About 1,483 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Jackson Avenue over Peapack Brook?

The structure is 36 ft (11 m) long with a longest span of 32 ft (9.8 m) and a deck 31 ft wide.

Who owns Jackson Avenue over Peapack Brook?

It is owned by the County Highway Agency.