US Bridges

RTE 345 over Grasse River

Good

St. Lawrence County, New York · 0.2 MI NW of 345 310 Int. · Structure no. 000000001027310

Built
1882
143 years old, rebuilt 2009
Condition
Good
inspected July 2023
Type
Arch - Deck
Masonry
Length
403 ft
9 main spans
Daily traffic
3,405
2020 count
Owner
State
State Highway Agency

About this bridge

RTE 345 over Grasse River is a masonry arch - deck carrying RTE 345 over Grasse River in St. Lawrence County, New York. It was built in 1882 and reconstructed in 2009, so it is 143 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 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 3,405 vehicles a day, roughly 10% of them trucks, projected to reach 3,552 by 2041. The structure is 403 ft (122.8 m) long and 28 ft wide. If it were closed, the detour would be 10.6 mi (17 km).

Location

Open in Google Maps
CarriesRTE 345
CrossesGrasse River
Location0.2 MI NW of 345 310 Int.
RouteState Highway 345
CountySt. Lawrence County
StateNew York
Coordinates44.74688, -75.1304
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
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating84 US tons
Inventory rating50 US tons

Structure

Structure typeArch - Deck
MaterialMasonry
DeckNot applicable
Main spans9
Design loadHS 25 or greater
Structure length403 ft (122.8 m)
Longest span45 ft (13.7 m)
Deck width28 ft (8.5 m)
Roadway width24 ft (7.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,405 (2020)
Projected traffic3,552 by 2041
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed10.6 mi (17 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusEligible for the National Register of Historic Places
Work proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$8.3 million (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was RTE 345 over Grasse River built?

It was built in 1882, making it 143 years old in 2025. It was reconstructed in 2009.

What condition is RTE 345 over Grasse River 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 July 2023.

How much traffic does RTE 345 over Grasse River carry?

About 3,405 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is RTE 345 over Grasse River?

The structure is 403 ft (122.8 m) long with a longest span of 45 ft (13.7 m) and a deck 28 ft wide.

Who owns RTE 345 over Grasse River?

It is owned by the State Highway Agency.