US Bridges

Route 31 over Peters Brook

Good

Hunterdon County, New Jersey · 7.25MI N.Of Penngtn Crcle · Structure no. 1010151

Built
1927
98 years old, rebuilt 2018
Condition
Good
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
47 ft
1 main span
Daily traffic
17,020
2024 count
Owner
State
State Highway Agency

About this bridge

Route 31 over Peters Brook is a steel stringer/multi-beam or girder carrying Route 31 over Peters Brook in Hunterdon County, New Jersey. It was built in 1927 and reconstructed in 2018, so it is 98 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 good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 17,020 vehicles a day, roughly 7% of them trucks, projected to reach 20,426 by 2044. The structure is 47 ft (14.3 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesRoute 31
CrossesPeters Brook
Location7.25MI N.Of Penngtn Crcle
RouteState Highway 31
Coordinates40.39249, -74.83444
Functional classRural Principal Arterial - Other

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure9 ExcellentNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating106.8 US tons
Inventory rating106.8 US tons

Structure

MaterialSteel
DeckConcrete, precast panels
Main spans1
Design loadHL 93
Structure length47 ft (14.3 m)
Longest span42 ft (12.8 m)
Deck width44 ft (13.3 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic17,020 (2024)
Projected traffic20,426 by 2044
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkNon-Interstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedDeck replacement with only incidental widening
Estimated improvement cost$425,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Route 31 over Peters Brook built?

It was built in 1927, making it 98 years old in 2025. It was reconstructed in 2018.

What condition is Route 31 over Peters Brook in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in April 2024.

How much traffic does Route 31 over Peters Brook carry?

About 17,020 vehicles per day (2024 count), of which roughly 7% are trucks.

How long is Route 31 over Peters Brook?

The structure is 47 ft (14.3 m) long with a longest span of 42 ft (12.8 m) and a deck 44 ft wide.

Who owns Route 31 over Peters Brook?

It is owned by the State Highway Agency.