US Bridges

County Road 49 over Plum Brook

Good

St. Lawrence County, New York · Located in Brookdale · Structure no. 000000003341900

Built
1938
87 years old, rebuilt 2009
Condition
Good
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
42 ft
1 main span
Daily traffic
415
2018 count
Owner
County
County Highway Agency

About this bridge

County Road 49 over Plum Brook is a steel stringer/multi-beam or girder carrying County Road 49 over Plum Brook in St. Lawrence County, New York. It was built in 1938 and reconstructed in 2009, so it is 87 years old, older 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 415 vehicles a day, roughly 10% of them trucks, projected to reach 581 by 2038. The structure is 42 ft (12.8 m) long and 33 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

CarriesCounty Road 49
CrossesPlum Brook
LocationLocated in Brookdale
RouteCounty Highway 0
Coordinates44.80907, -74.89611
Functional classRural Minor Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Deck9 ExcellentNo problems noted.
Superstructure9 ExcellentNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating80 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length42 ft (12.8 m)
Longest span40 ft (12.1 m)
Deck width33 ft (10.1 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic415 (2018)
Projected traffic581 by 2038
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$890,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was County Road 49 over Plum Brook built?

It was built in 1938, making it 87 years old in 2025. It was reconstructed in 2009.

What condition is County Road 49 over Plum 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 June 2023.

How much traffic does County Road 49 over Plum Brook carry?

About 415 vehicles per day (2018 count), of which roughly 10% are trucks.

How long is County Road 49 over Plum Brook?

The structure is 42 ft (12.8 m) long with a longest span of 40 ft (12.1 m) and a deck 33 ft wide.

Who owns County Road 49 over Plum Brook?

It is owned by the County Highway Agency.