US Bridges

County Route 520 over Big Brook

Fair

Monmouth County, New Jersey · 0.08 MI W of Route Nj 79 · Structure no. 130ML23

Built
1973
52 years old
Condition
Fair
inspected February 2023
Type
Frame
Concrete
Length
24 ft
1 main span
Daily traffic
13,440
2023 count
Owner
County
County Highway Agency

About this bridge

County Route 520 over Big Brook is a concrete frame carrying County Route 520 over Big Brook in Monmouth County, New Jersey. It was built in 1973, so it is 52 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 13,440 vehicles a day, roughly 4% of them trucks, projected to reach 16,128 by 2043. The structure is 24 ft (7.3 m) long and 62 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesCounty Route 520
CrossesBig Brook
Location0.08 MI W of Route Nj 79
RouteCounty Highway 520
CountyMonmouth County
StateNew Jersey
Coordinates40.33336, -74.24717
Functional classUrban Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating33 US tons
Inventory rating20 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckNot applicable
Main spans1
Design loadUnknown
Structure length24 ft (7.3 m)
Longest span21 ft (6.4 m)
Deck width62 ft (18.9 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,440 (2023)
Projected traffic16,128 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 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 520 over Big Brook built?

It was built in 1973, making it 52 years old in 2025.

What condition is County Route 520 over Big 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 February 2023.

How much traffic does County Route 520 over Big Brook carry?

About 13,440 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is County Route 520 over Big Brook?

The structure is 24 ft (7.3 m) long with a longest span of 21 ft (6.4 m) and a deck 62 ft wide.

Who owns County Route 520 over Big Brook?

It is owned by the County Highway Agency.