US Bridges

Nj 33(FRANKLIN St) over Rocky Brook

Fair

Mercer County, New Jersey · 1.84 MI E of US130 Junc · Structure no. 1115150

Built
1907
118 years old, rebuilt 1981
Condition
Fair
inspected June 2024
Type
Arch - Deck
Steel
Length
75 ft
4 main spans
Daily traffic
10,922
2024 count
Owner
State
State Highway Agency

About this bridge

Nj 33(FRANKLIN St) over Rocky Brook is a steel arch - deck carrying Nj 33(FRANKLIN St) over Rocky Brook in Mercer County, New Jersey. It was built in 1907 and reconstructed in 1981, so it is 118 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 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 10,922 vehicles a day, roughly 4% of them trucks, projected to reach 13,327 by 2044. The structure is 75 ft (22.9 m) long and 58 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesNj 33(FRANKLIN St)
CrossesRocky Brook
Location1.84 MI E of US130 Junc
RouteState Highway 33
CountyMercer County
StateNew Jersey
Coordinates40.27017, -74.52261
Functional classUrban Other Principal 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.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating84 US tons

Structure

Structure typeArch - Deck
MaterialSteel
DeckNot applicable
Main spans4
Design loadUnknown
Structure length75 ft (22.9 m)
Longest span14 ft (4.3 m)
Deck width58 ft (17.8 m)
Roadway width37 ft (11.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,922 (2024)
Projected traffic13,327 by 2044
Trucks4%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusEligible for the National Register of Historic Places
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$76,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Nj 33(FRANKLIN St) over Rocky Brook built?

It was built in 1907, making it 118 years old in 2025. It was reconstructed in 1981.

What condition is Nj 33(FRANKLIN St) over Rocky 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 June 2024.

How much traffic does Nj 33(FRANKLIN St) over Rocky Brook carry?

About 10,922 vehicles per day (2024 count), of which roughly 4% are trucks.

How long is Nj 33(FRANKLIN St) over Rocky Brook?

The structure is 75 ft (22.9 m) long with a longest span of 14 ft (4.3 m) and a deck 58 ft wide.

Who owns Nj 33(FRANKLIN St) over Rocky Brook?

It is owned by the State Highway Agency.