US Bridges

RTE 11 over Allen Brook

Fair

St. Lawrence County, New York · 2.5 MI W of Lawrenceville · Structure no. 000000003341190

Built
1940
85 years old, rebuilt 1990
Condition
Fair
inspected May 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
31 ft
1 main span
Daily traffic
2,342
2021 count
Owner
State
State Highway Agency

About this bridge

RTE 11 over Allen Brook is a prestressed concrete box beam or girders - multiple carrying RTE 11 over Allen Brook in St. Lawrence County, New York. It was built in 1940 and reconstructed in 1990, so it is 85 years old, older than the New York average of 53 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 2,342 vehicles a day, roughly 17% of them trucks, projected to reach 2,364 by 2041. The structure is 31 ft (9.4 m) long and 38 ft wide. If it were closed, the detour would be 2.5 mi (4 km).

Location

Open in Google Maps
CarriesRTE 11
CrossesAllen Brook
Location2.5 MI W of Lawrenceville
RouteState Highway 11
CountySt. Lawrence County
StateNew York
Coordinates44.77439, -74.69632
Functional classRural Principal Arterial - Other

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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating95 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckNot applicable
Main spans1
Design loadHS 20
Structure length31 ft (9.4 m)
Longest span29 ft (8.8 m)
Deck width38 ft (11.6 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,342 (2021)
Projected traffic2,364 by 2041
Trucks17%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed2.5 mi (4 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$574,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was RTE 11 over Allen Brook built?

It was built in 1940, making it 85 years old in 2025. It was reconstructed in 1990.

What condition is RTE 11 over Allen 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 May 2024.

How much traffic does RTE 11 over Allen Brook carry?

About 2,342 vehicles per day (2021 count), of which roughly 17% are trucks.

How long is RTE 11 over Allen Brook?

The structure is 31 ft (9.4 m) long with a longest span of 29 ft (8.8 m) and a deck 38 ft wide.

Who owns RTE 11 over Allen Brook?

It is owned by the State Highway Agency.