US Bridges

Arenac State Road over Rifle River

Good

Arenac County, Michigan · 1.5 MI South of Omer · Structure no. 000000000000445

Built
1941
84 years old, rebuilt 2011
Condition
Good
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
113 ft
2 main spans
Daily traffic
830
1998 count
Owner
County
County Highway Agency

About this bridge

Arenac State Road over Rifle River is a steel stringer/multi-beam or girder carrying Arenac State Road over Rifle River in Arenac County, Michigan. It was built in 1941 and reconstructed in 2011, so it is 84 years old, older than the Michigan average of 48.3 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 830 vehicles a day, roughly 5% of them trucks, projected to reach 1,450 by 2030. The structure is 113 ft (34.3 m) long and 33 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesArenac State Road
CrossesRifle River
Location1.5 MI South of Omer
RouteCounty Highway 645
Coordinates44.03492, -83.8468
Functional classRural Minor Collector

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating70.3 US tons
Inventory rating42.1 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadH 15
Structure length113 ft (34.3 m)
Longest span56 ft (17 m)
Deck width33 ft (10.1 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic830 (1998)
Projected traffic1,450 by 2030
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Arenac State Road over Rifle River built?

It was built in 1941, making it 84 years old in 2025. It was reconstructed in 2011.

What condition is Arenac State Road over Rifle 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 August 2024.

How much traffic does Arenac State Road over Rifle River carry?

About 830 vehicles per day (1998 count), of which roughly 5% are trucks.

How long is Arenac State Road over Rifle River?

The structure is 113 ft (34.3 m) long with a longest span of 56 ft (17 m) and a deck 33 ft wide.

Who owns Arenac State Road over Rifle River?

It is owned by the County Highway Agency.