US Bridges

M-64 & M-38 over Ontonagon R River RD RR

Fair

Ontonagon County, Michigan · Ontonagon · Structure no. 000000000013265

Built
2005
20 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
1,697 ft
13 main spans
Daily traffic
3,625
2007 count
Owner
State
State Highway Agency

About this bridge

M-64 & M-38 over Ontonagon R River RD RR is a prestressed concrete stringer/multi-beam or girder carrying M-64 & M-38 over Ontonagon R River RD RR in Ontonagon County, Michigan. It was built in 2005, so it is 20 years old, younger than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 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 3,625 vehicles a day, roughly 5% of them trucks, projected to reach 6,800 by 2025. The structure is 1,697 ft (517.1 m) long and 57 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

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CarriesM-64 & M-38
CrossesOntonagon R River RD RR
LocationOntonagon
RouteState Highway 64
CountyOntonagon County
StateMichigan
Coordinates46.86678, -89.31505
Functional classRural Minor 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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating104.6 US tons
Inventory rating30.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans13
Design loadHS 25 or greater
Structure length1,697 ft (517.1 m)
Longest span131 ft (39.8 m)
Deck width57 ft (17.4 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,625 (2007)
Projected traffic6,800 by 2025
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway, waterway and railroad
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was M-64 & M-38 over Ontonagon R River RD RR built?

It was built in 2005, making it 20 years old in 2025.

What condition is M-64 & M-38 over Ontonagon R River RD RR 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 June 2024.

How much traffic does M-64 & M-38 over Ontonagon R River RD RR carry?

About 3,625 vehicles per day (2007 count), of which roughly 5% are trucks.

How long is M-64 & M-38 over Ontonagon R River RD RR?

The structure is 1,697 ft (517.1 m) long with a longest span of 131 ft (39.8 m) and a deck 57 ft wide.

Who owns M-64 & M-38 over Ontonagon R River RD RR?

It is owned by the State Highway Agency.