US Bridges

I-69 NB over Sauk River

Fair

Branch County, Michigan · 0.8 MI S of US-12 · Structure no. 000000000001076

Built
1967
58 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
47 ft
1 main span
Daily traffic
17,675
2013 count
Owner
State
State Highway Agency

About this bridge

I-69 NB over Sauk River is a steel stringer/multi-beam or girder carrying I-69 NB over Sauk River in Branch County, Michigan. It was built in 1967, so it is 58 years old, older 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 17,675 vehicles a day, roughly 31% of them trucks, projected to reach 19,525 by 2033. The structure is 47 ft (14.3 m) long and 42 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-69 NB
CrossesSauk River
Location0.8 MI S of US-12
RouteInterstate 69
CountyBranch County
StateMichigan
Coordinates41.92443, -84.97267
Functional classRural 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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating64.6 US tons
Inventory rating38.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length47 ft (14.3 m)
Longest span47 ft (14.3 m)
Deck width42 ft (12.9 m)
Roadway width39 ft (11.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic17,675 (2013)
Projected traffic19,525 by 2033
Trucks31%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was I-69 NB over Sauk River built?

It was built in 1967, making it 58 years old in 2025.

What condition is I-69 NB over Sauk 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 May 2023.

How much traffic does I-69 NB over Sauk River carry?

About 17,675 vehicles per day (2013 count), of which roughly 31% are trucks.

How long is I-69 NB over Sauk River?

The structure is 47 ft (14.3 m) long with a longest span of 47 ft (14.3 m) and a deck 42 ft wide.

Who owns I-69 NB over Sauk River?

It is owned by the State Highway Agency.