US Bridges

Chimney Rock RD over Middle Brook

Good

Somerset County, New Jersey · 0.94 MI N of US 22 JCT · Structure no. 18G0810

Built
2003
22 years old
Condition
Good
inspected September 2023
Type
Arch - Deck
Concrete
Length
54 ft
1 main span
Daily traffic
11,646
2023 count
Owner
County
County Highway Agency

About this bridge

Chimney Rock RD over Middle Brook is a concrete arch - deck carrying Chimney Rock RD over Middle Brook in Somerset County, New Jersey. It was built in 2003, so it is 22 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 11,646 vehicles a day, roughly 3% of them trucks, projected to reach 14,211 by 2043. The structure is 54 ft (16.5 m) long and 41 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesChimney Rock RD
CrossesMiddle Brook
Location0.94 MI N of US 22 JCT
RouteCounty Highway 525
Coordinates40.58475, -74.5607
Functional classUrban Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating110.1 US tons
Inventory rating91.1 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHS 20 + Mod
Structure length54 ft (16.5 m)
Longest span54 ft (16.5 m)
Deck width41 ft (12.4 m)
Roadway width35 ft (10.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,646 (2023)
Projected traffic14,211 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 Chimney Rock RD over Middle Brook built?

It was built in 2003, making it 22 years old in 2025.

What condition is Chimney Rock RD over Middle 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 September 2023.

How much traffic does Chimney Rock RD over Middle Brook carry?

About 11,646 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Chimney Rock RD over Middle Brook?

The structure is 54 ft (16.5 m) long with a longest span of 54 ft (16.5 m) and a deck 41 ft wide.

Who owns Chimney Rock RD over Middle Brook?

It is owned by the County Highway Agency.