US Bridges

S. Middlebush RD over Six Mile Run

Good

Somerset County, New Jersey · 0.33 MI S of Hilltop LN · Structure no. 18H0403

Built
2017
8 years old
Condition
Good
inspected September 2023
Type
Slab
Wood or Timber
Length
30 ft
1 main span
Daily traffic
16,717
2023 count
Owner
County
County Highway Agency

About this bridge

S. Middlebush RD over Six Mile Run is a wood or timber slab carrying S. Middlebush RD over Six Mile Run in Somerset County, New Jersey. It was built in 2017, so it is 8 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 16,717 vehicles a day, roughly 4% of them trucks, projected to reach 20,398 by 2043. The structure is 30 ft (9.1 m) long and 32 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesS. Middlebush RD
CrossesSix Mile Run
Location0.33 MI S of Hilltop LN
RouteCounty Highway 615
CountySomerset County
StateNew Jersey
Coordinates40.46979, -74.54435
Functional classUrban Minor Arterial

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.
Substructure9 ExcellentNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation9: Superior to present desirable criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating73 US tons

Structure

Structure typeSlab
MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadHS 25 or greater
Structure length30 ft (9.1 m)
Longest span28 ft (8.5 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic16,717 (2023)
Projected traffic20,398 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$336,000
NavigationNo navigation control on waterway

Frequently asked questions

When was S. Middlebush RD over Six Mile Run built?

It was built in 2017, making it 8 years old in 2025.

What condition is S. Middlebush RD over Six Mile Run 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 September 2023.

How much traffic does S. Middlebush RD over Six Mile Run carry?

About 16,717 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is S. Middlebush RD over Six Mile Run?

The structure is 30 ft (9.1 m) long with a longest span of 28 ft (8.5 m) and a deck 32 ft wide.

Who owns S. Middlebush RD over Six Mile Run?

It is owned by the County Highway Agency.