US Bridges

RTE I81 over Swamp Road

Fair

Oswego County, New York · W Monroe @ Oneida Lake · Structure no. 000000001031772

Built
1959
66 years old
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
134 ft
3 main spans
Daily traffic
16,277
2020 count
Owner
State
State Highway Agency

About this bridge

RTE I81 over Swamp Road is a steel stringer/multi-beam or girder carrying RTE I81 over Swamp Road in Oswego County, New York. It was built in 1959, so it is 66 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 5 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 16,277 vehicles a day, roughly 13% of them trucks, projected to reach 23,479 by 2041. The structure is 134 ft (40.8 m) long and 53 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesRTE I81
CrossesSwamp Road
LocationW Monroe @ Oneida Lake
RouteInterstate 81
CountyOswego County
StateNew York
Coordinates43.24146, -76.13097
Functional classUrban Principal Arterial - Interstate

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating63.1 US tons
Inventory rating38 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length134 ft (40.8 m)
Longest span45 ft (13.7 m)
Deck width53 ft (16.1 m)
Roadway width49 ft (14.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic16,277 (2020)
Projected traffic23,479 by 2041
Trucks13%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedDeck replacement with only incidental widening
Estimated improvement cost$2.6 million (2024 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was RTE I81 over Swamp Road built?

It was built in 1959, making it 66 years old in 2025.

What condition is RTE I81 over Swamp Road 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 I81 over Swamp Road carry?

About 16,277 vehicles per day (2020 count), of which roughly 13% are trucks.

How long is RTE I81 over Swamp Road?

The structure is 134 ft (40.8 m) long with a longest span of 45 ft (13.7 m) and a deck 53 ft wide.

Who owns RTE I81 over Swamp Road?

It is owned by the State Highway Agency.