US Bridges

US 206 over Stony Brook

Fair

Mercer County, New Jersey · 2.31 MI N of CR 569 · Structure no. 1129155

Built
1792
233 years old, rebuilt 2017
Condition
Fair
inspected September 2023
Type
Arch - Deck
Concrete
Length
82 ft
3 main spans
Daily traffic
11,724
2023 count
Owner
State
State Highway Agency

About this bridge

US 206 over Stony Brook is a concrete arch - deck carrying US 206 over Stony Brook in Mercer County, New Jersey. It was built in 1792 and reconstructed in 2017, so it is 233 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 11,724 vehicles a day, roughly 4% of them trucks, projected to reach 2,032 by 2043. The structure is 82 ft (25 m) long and 34 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesUS 206
CrossesStony Brook
Location2.31 MI N of CR 569
RouteU.S. Route 206
CountyMercer County
StateNew Jersey
Coordinates40.33308, -74.68207
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.
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 inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating53.9 US tons
Inventory rating41.8 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHL 93
Structure length82 ft (25 m)
Longest span27 ft (8.2 m)
Deck width34 ft (10.3 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,724 (2023)
Projected traffic2,032 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusListed on the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was US 206 over Stony Brook built?

It was built in 1792, making it 233 years old in 2025. It was reconstructed in 2017.

What condition is US 206 over Stony 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 September 2023.

How much traffic does US 206 over Stony Brook carry?

About 11,724 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is US 206 over Stony Brook?

The structure is 82 ft (25 m) long with a longest span of 27 ft (8.2 m) and a deck 34 ft wide.

Who owns US 206 over Stony Brook?

It is owned by the State Highway Agency.