US Bridges

Shannon Road over Blair Creek

Fair

Warren County, New Jersey · 1 MI N Birch Ridge Road · Structure no. 2100911

Built
1940
85 years old
Condition
Fair
inspected March 2023
Type
Slab
Concrete
Length
26 ft
1 main span
Daily traffic
250
2023 count
Owner
County
County Highway Agency

About this bridge

Shannon Road over Blair Creek is a concrete slab carrying Shannon Road over Blair Creek in Warren County, New Jersey. It was built in 1940, so it is 85 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 250 vehicles a day, roughly 3% of them trucks, projected to reach 305 by 2043. The structure is 26 ft (7.9 m) long and 28 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesShannon Road
CrossesBlair Creek
Location1 MI N Birch Ridge Road
RouteCity Street 0
CountyWarren County
StateNew Jersey
Coordinates41.05016, -74.94439
Functional classRural Local

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating60 US tons
Inventory rating36 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length26 ft (7.9 m)
Longest span23 ft (7 m)
Deck width28 ft (8.5 m)
Roadway width25 ft (7.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic250 (2023)
Projected traffic305 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 Shannon Road over Blair Creek built?

It was built in 1940, making it 85 years old in 2025.

What condition is Shannon Road over Blair Creek 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 March 2023.

How much traffic does Shannon Road over Blair Creek carry?

About 250 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Shannon Road over Blair Creek?

The structure is 26 ft (7.9 m) long with a longest span of 23 ft (7 m) and a deck 28 ft wide.

Who owns Shannon Road over Blair Creek?

It is owned by the County Highway Agency.