US Bridges

RTE 56 over Parkhurst Brook

Fair

St. Lawrence County, New York · .3 MI NW JCT SH 56 & SH 7 · Structure no. 000000001061060

Built
1947
78 years old
Condition
Fair
inspected May 2024
Type
Slab
Concrete
Length
32 ft
1 main span
Daily traffic
4,069
2018 count
Owner
State
State Highway Agency

About this bridge

RTE 56 over Parkhurst Brook is a concrete slab carrying RTE 56 over Parkhurst Brook in St. Lawrence County, New York. It was built in 1947, so it is 78 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 4,069 vehicles a day, roughly 8% of them trucks, projected to reach 4,943 by 2041. The structure is 32 ft (9.8 m) long and 41 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesRTE 56
CrossesParkhurst Brook
Location.3 MI NW JCT SH 56 & SH 7
RouteState Highway 56
CountySt. Lawrence County
StateNew York
Coordinates44.653, -74.9709
Functional classUrban Minor 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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation6: Equal to 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 rating59 US tons
Inventory rating35.1 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckNot applicable
Main spans1
Design loadH 20
Structure length32 ft (9.8 m)
Longest span30 ft (9.1 m)
Deck width41 ft (12.4 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,069 (2018)
Projected traffic4,943 by 2041
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
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$703,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was RTE 56 over Parkhurst Brook built?

It was built in 1947, making it 78 years old in 2025.

What condition is RTE 56 over Parkhurst 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 56 over Parkhurst Brook carry?

About 4,069 vehicles per day (2018 count), of which roughly 8% are trucks.

How long is RTE 56 over Parkhurst Brook?

The structure is 32 ft (9.8 m) long with a longest span of 30 ft (9.1 m) and a deck 41 ft wide.

Who owns RTE 56 over Parkhurst Brook?

It is owned by the State Highway Agency.