US Bridges

RTE 11C over Allen Brook

Good

St. Lawrence County, New York · 3.4 MI E JCT Rts 11 & 420 · Structure no. 000000001008890

Built
1997
28 years old
Condition
Good
inspected September 2023
Type
Frame
Concrete
Length
41 ft
1 main span
Daily traffic
1,185
2019 count
Owner
State
State Highway Agency

About this bridge

RTE 11C over Allen Brook is a concrete frame carrying RTE 11C over Allen Brook in St. Lawrence County, New York. It was built in 1997, so it is 28 years old, younger than the New York average of 53 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,185 vehicles a day, roughly 7% of them trucks, projected to reach 1,236 by 2041. The structure is 41 ft (12.5 m) long and 36 ft wide.

Location

Open in Google Maps
CarriesRTE 11C
CrossesAllen Brook
Location3.4 MI E JCT Rts 11 & 420
RouteU.S. Route 11C
CountySt. Lawrence County
StateNew York
Coordinates44.80183, -74.72784
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2023
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 adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating79 US tons
Inventory rating47 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHS 25 or greater
Structure length41 ft (12.5 m)
Longest span32 ft (9.7 m)
Deck width36 ft (11.1 m)
Roadway width33 ft (10.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,185 (2019)
Projected traffic1,236 by 2041
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemNo

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$887,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was RTE 11C over Allen Brook built?

It was built in 1997, making it 28 years old in 2025.

What condition is RTE 11C over Allen Brook in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2023.

How much traffic does RTE 11C over Allen Brook carry?

About 1,185 vehicles per day (2019 count), of which roughly 7% are trucks.

How long is RTE 11C over Allen Brook?

The structure is 41 ft (12.5 m) long with a longest span of 32 ft (9.7 m) and a deck 36 ft wide.

Who owns RTE 11C over Allen Brook?

It is owned by the State Highway Agency.