US Bridges

Locktn-Sgtville RD over Plum Brook

Fair

Hunterdon County, New Jersey · 1.6 MI North of CR 523 · Structure no. 100D424

Built
1925
100 years old, rebuilt 2002
Condition
Fair
inspected April 2023
Type
Truss - Thru
Steel
Length
49 ft
1 main span
Daily traffic
477
2023 count
Owner
County
County Highway Agency

About this bridge

Locktn-Sgtville RD over Plum Brook is a steel truss - thru carrying Locktn-Sgtville RD over Plum Brook in Hunterdon County, New Jersey. It was built in 1925 and reconstructed in 2002, so it is 100 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 477 vehicles a day, roughly 5% of them trucks, projected to reach 572 by 2043. The structure is 49 ft (14.9 m) long and 25 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesLocktn-Sgtville RD
CrossesPlum Brook
Location1.6 MI North of CR 523
CountyHunterdon County
StateNew Jersey
Coordinates40.46864, -74.95755
Functional classRural Minor 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
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
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 adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating41 US tons
Inventory rating24 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckCorrugated steel
Main spans1
Design loadUnknown
Structure length49 ft (14.9 m)
Longest span47 ft (14.3 m)
Deck width25 ft (7.7 m)
Roadway width25 ft (7.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic477 (2023)
Projected traffic572 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 Locktn-Sgtville RD over Plum Brook built?

It was built in 1925, making it 100 years old in 2025. It was reconstructed in 2002.

What condition is Locktn-Sgtville 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 April 2023.

How much traffic does Locktn-Sgtville RD over Plum Brook carry?

About 477 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Locktn-Sgtville RD over Plum Brook?

The structure is 49 ft (14.9 m) long with a longest span of 47 ft (14.3 m) and a deck 25 ft wide.

Who owns Locktn-Sgtville RD over Plum Brook?

It is owned by the County Highway Agency.