US Bridges

County Route 602 over Tributary Back Brook

Fair

Hunterdon County, New Jersey · 0.3MI E of Runyon Mill RD · Structure no. 1000118

Built
2015
10 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
57 ft
1 main span
Daily traffic
1,854
2023 count
Owner
County
County Highway Agency

About this bridge

County Route 602 over Tributary Back Brook is a steel stringer/multi-beam or girder carrying County Route 602 over Tributary Back Brook in Hunterdon County, New Jersey. It was built in 2015, so it is 10 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 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 1,854 vehicles a day, roughly 3% of them trucks, projected to reach 2,263 by 2043. The structure is 57 ft (17.4 m) long and 42 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesCounty Route 602
CrossesTributary Back Brook
Location0.3MI E of Runyon Mill RD
RouteCounty Highway 602
CountyHunterdon County
StateNew Jersey
Coordinates40.43564, -74.81893
Functional classRural Major 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.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating106.8 US tons
Inventory rating106.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length57 ft (17.4 m)
Longest span49 ft (14.9 m)
Deck width42 ft (12.8 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,854 (2023)
Projected traffic2,263 by 2043
Trucks3%
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 County Route 602 over Tributary Back Brook built?

It was built in 2015, making it 10 years old in 2025.

What condition is County Route 602 over Tributary Back 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 County Route 602 over Tributary Back Brook carry?

About 1,854 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is County Route 602 over Tributary Back Brook?

The structure is 57 ft (17.4 m) long with a longest span of 49 ft (14.9 m) and a deck 42 ft wide.

Who owns County Route 602 over Tributary Back Brook?

It is owned by the County Highway Agency.