US Bridges

RTE 921C over Mohawk River

Fair

Oneida County, New York · 0.2 MI S JCT Rts 31 & I90 · Structure no. 000000004051710

Built
1968
57 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
249 ft
3 main spans
Daily traffic
22,488
2020 count
Owner
State
State Highway Agency

About this bridge

RTE 921C over Mohawk River is a steel stringer/multi-beam or girder carrying RTE 921C over Mohawk River in Oneida County, New York. It was built in 1968, so it is 57 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 22,488 vehicles a day, roughly 9% of them trucks, projected to reach 22,593 by 2041. The structure is 249 ft (75.9 m) long and 66 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesRTE 921C
CrossesMohawk River
Location0.2 MI S JCT Rts 31 & I90
RouteState Highway 921C
CountyOneida County
StateNew York
Coordinates43.11127, -75.21704
Functional classUrban Other Principal 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating75.9 US tons
Inventory rating45 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length249 ft (75.9 m)
Longest span82 ft (24.9 m)
Deck width66 ft (20.2 m)
Roadway width52 ft (15.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic22,488 (2020)
Projected traffic22,593 by 2041
Trucks9%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

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$4.6 million (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was RTE 921C over Mohawk River built?

It was built in 1968, making it 57 years old in 2025.

What condition is RTE 921C over Mohawk River 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 August 2024.

How much traffic does RTE 921C over Mohawk River carry?

About 22,488 vehicles per day (2020 count), of which roughly 9% are trucks.

How long is RTE 921C over Mohawk River?

The structure is 249 ft (75.9 m) long with a longest span of 82 ft (24.9 m) and a deck 66 ft wide.

Who owns RTE 921C over Mohawk River?

It is owned by the State Highway Agency.