US Bridges

Black River Road over Herzog Brook

Good

Somerset County, New Jersey · 0.6 MI So Pottersville RD · Structure no. 18C1301

Built
1998
27 years old
Condition
Good
inspected August 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
31 ft
1 main span
Daily traffic
1,166
2023 count
Owner
County
County Highway Agency

About this bridge

Black River Road over Herzog Brook is a wood or timber stringer/multi-beam or girder carrying Black River Road over Herzog Brook in Somerset County, New Jersey. It was built in 1998, so it is 27 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 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 1,166 vehicles a day, roughly 5% of them trucks, projected to reach 1,400 by 2043. The structure is 31 ft (9.4 m) long and 30 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

CarriesBlack River Road
CrossesHerzog Brook
Location0.6 MI So Pottersville RD
Coordinates40.70682, -74.71653
Functional classRural Minor Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
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 alignment7: Better than present minimum criteria
Operating rating60 US tons
Inventory rating40 US tons

Structure

MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadHS 20 + Mod
Structure length31 ft (9.4 m)
Longest span26 ft (7.9 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,166 (2023)
Projected traffic1,400 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 Black River Road over Herzog Brook built?

It was built in 1998, making it 27 years old in 2025.

What condition is Black River Road over Herzog 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 August 2023.

How much traffic does Black River Road over Herzog Brook carry?

About 1,166 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Black River Road over Herzog Brook?

The structure is 31 ft (9.4 m) long with a longest span of 26 ft (7.9 m) and a deck 30 ft wide.

Who owns Black River Road over Herzog Brook?

It is owned by the County Highway Agency.