US Bridges

Dyke Road over Mohawk River

Good

Herkimer County, New York · .7 MI SW JCT CR 37 & I90 · Structure no. 000000003307660

Built
1981
44 years old
Condition
Good
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
326 ft
2 main spans
Daily traffic
6,235
2018 count
Owner
County
County Highway Agency

About this bridge

Dyke Road over Mohawk River is a steel continuous stringer/multi-beam or girder carrying Dyke Road over Mohawk River in Herkimer County, New York. It was built in 1981, so it is 44 years old, younger 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 6,235 vehicles a day, roughly 13% of them trucks, projected to reach 7,574 by 2041. The structure is 326 ft (99.4 m) long and 46 ft wide. If it were closed, the detour would be 7.5 mi (12 km).

Location

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CarriesDyke Road
CrossesMohawk River
Location.7 MI SW JCT CR 37 & I90
RouteCounty Highway 0
CountyHerkimer County
StateNew York
Coordinates43.09156, -75.15754
Functional classUrban Minor Arterial

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 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 geometry6: Equal to present minimum criteria
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating88 US tons
Inventory rating53 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length326 ft (99.4 m)
Longest span162 ft (49.3 m)
Deck width46 ft (14 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,235 (2018)
Projected traffic7,574 by 2041
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed7.5 mi (12 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$4.6 million (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Dyke Road over Mohawk River built?

It was built in 1981, making it 44 years old in 2025.

What condition is Dyke Road over Mohawk 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 June 2023.

How much traffic does Dyke Road over Mohawk River carry?

About 6,235 vehicles per day (2018 count), of which roughly 13% are trucks.

How long is Dyke Road over Mohawk River?

The structure is 326 ft (99.4 m) long with a longest span of 162 ft (49.3 m) and a deck 46 ft wide.

Who owns Dyke Road over Mohawk River?

It is owned by the County Highway Agency.