US Bridges

Stone Sign Post RD over Plum Brook

Fair

Hunterdon County, New Jersey · 0.6 Mi. West of CR 579 · Structure no. 1000113

Built
1932
93 years old, rebuilt 1995
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
25 ft
1 main span
Daily traffic
149
2023 count
Owner
County
County Highway Agency

About this bridge

Stone Sign Post RD over Plum Brook is a steel stringer/multi-beam or girder carrying Stone Sign Post RD over Plum Brook in Hunterdon County, New Jersey. It was built in 1932 and reconstructed in 1995, so it is 93 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 149 vehicles a day, roughly 3% of them trucks, projected to reach 182 by 2043. The structure is 25 ft (7.6 m) long and 21 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesStone Sign Post RD
CrossesPlum Brook
Location0.6 Mi. West of CR 579
Coordinates40.48708, -74.9428
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
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 alignment6: Equal to present minimum criteria
Operating rating59 US tons
Inventory rating35.1 US tons

Structure

MaterialSteel
DeckCorrugated steel
Main spans1
Design loadUnknown
Structure length25 ft (7.6 m)
Longest span23 ft (7 m)
Deck width21 ft (6.4 m)
Roadway width20 ft (6.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic149 (2023)
Projected traffic182 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Stone Sign Post RD over Plum Brook built?

It was built in 1932, making it 93 years old in 2025. It was reconstructed in 1995.

What condition is Stone Sign Post RD over Plum 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 March 2023.

How much traffic does Stone Sign Post RD over Plum Brook carry?

About 149 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Stone Sign Post RD over Plum Brook?

The structure is 25 ft (7.6 m) long with a longest span of 23 ft (7 m) and a deck 21 ft wide.

Who owns Stone Sign Post RD over Plum Brook?

It is owned by the County Highway Agency.