US Bridges

US 46 over Branch of Troy Brook

Fair

Morris County, New Jersey · 0.20 MI W of I-80 WB · Structure no. 1410156

Built
1971
54 years old
Condition
Fair
inspected March 2023
Type
Slab
Prestressed Concrete
Length
22 ft
1 main span
Daily traffic
47,910
2023 count
Owner
State
State Highway Agency

About this bridge

US 46 over Branch of Troy Brook is a prestressed concrete slab carrying US 46 over Branch of Troy Brook in Morris County, New Jersey. It was built in 1971, so it is 54 years old, younger 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 47,910 vehicles a day, roughly 4% of them trucks, projected to reach 57,492 by 2043. The structure is 22 ft (6.7 m) long and 132 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesUS 46
CrossesBranch of Troy Brook
Location0.20 MI W of I-80 WB
RouteU.S. Route 46
CountyMorris County
StateNew Jersey
Coordinates40.86164, -74.37134
Functional classUrban Other Principal Arterial

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.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 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 geometry9: Superior to present desirable criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating69 US tons
Inventory rating41 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length22 ft (6.7 m)
Longest span20 ft (6.1 m)
Deck width132 ft (40.3 m)
Roadway width87 ft (26.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic47,910 (2023)
Projected traffic57,492 by 2043
Trucks4%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 US 46 over Branch of Troy Brook built?

It was built in 1971, making it 54 years old in 2025.

What condition is US 46 over Branch of Troy 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 US 46 over Branch of Troy Brook carry?

About 47,910 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is US 46 over Branch of Troy Brook?

The structure is 22 ft (6.7 m) long with a longest span of 20 ft (6.1 m) and a deck 132 ft wide.

Who owns US 46 over Branch of Troy Brook?

It is owned by the State Highway Agency.