US Bridges

Squan-Yellowbrk RD over Marsh Bog Brook

Fair

Monmouth County, New Jersey · 1/2 MI West of CR 524/547 · Structure no. 130HL47

Built
1948
77 years old, rebuilt 1981
Condition
Fair
inspected April 2023
Type
Slab
Concrete Continuous
Length
25 ft
2 main spans
Daily traffic
8,120
2023 count
Owner
County
County Highway Agency

About this bridge

Squan-Yellowbrk RD over Marsh Bog Brook is a concrete continuous slab carrying Squan-Yellowbrk RD over Marsh Bog Brook in Monmouth County, New Jersey. It was built in 1948 and reconstructed in 1981, so it is 77 years old, older 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 8,120 vehicles a day, roughly 3% of them trucks, projected to reach 9,744 by 2043. The structure is 25 ft (7.6 m) long and 30 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesSquan-Yellowbrk RD
CrossesMarsh Bog Brook
Location1/2 MI West of CR 524/547
RouteCounty Highway 524
CountyMonmouth County
StateNew Jersey
Coordinates40.16693, -74.15903
Functional classUrban 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.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionApril 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 geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating69 US tons
Inventory rating41 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length25 ft (7.6 m)
Longest span11 ft (3.4 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,120 (2023)
Projected traffic9,744 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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$237,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Squan-Yellowbrk RD over Marsh Bog Brook built?

It was built in 1948, making it 77 years old in 2025. It was reconstructed in 1981.

What condition is Squan-Yellowbrk RD over Marsh Bog 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 Squan-Yellowbrk RD over Marsh Bog Brook carry?

About 8,120 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Squan-Yellowbrk RD over Marsh Bog Brook?

The structure is 25 ft (7.6 m) long with a longest span of 11 ft (3.4 m) and a deck 30 ft wide.

Who owns Squan-Yellowbrk RD over Marsh Bog Brook?

It is owned by the County Highway Agency.