US Bridges

I-75 NB|US-23 NB over Sunsmith Drain

Fair

Arenac County, Michigan · 0.5 MI N of Worth RD · Structure no. 000000000000409

Built
1968
57 years old
Condition
Fair
inspected April 2024
Type
Culvert
Concrete
Length
22 ft
2 main spans
Daily traffic
27,470
2007 count
Owner
State
State Highway Agency

About this bridge

I-75 NB|US-23 NB over Sunsmith Drain is a concrete culvert carrying I-75 NB|US-23 NB over Sunsmith Drain in Arenac County, Michigan. It was built in 1968, so it is 57 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 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 27,470 vehicles a day, roughly 9% of them trucks, projected to reach 28,546 by 2018. The structure is 22 ft (6.8 m) long.

Location

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CarriesI-75 NB|US-23 NB
CrossesSunsmith Drain
Location0.5 MI N of Worth RD
RouteInterstate 75
CountyArenac County
StateMichigan
Coordinates43.93293, -84.0176
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionApril 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
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating80 US tons
Inventory rating47.8 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20 + Mod
Structure length22 ft (6.8 m)
Longest span10 ft (3.2 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic27,470 (2007)
Projected traffic28,546 by 2018
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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-75 NB|US-23 NB over Sunsmith Drain built?

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

What condition is I-75 NB|US-23 NB over Sunsmith Drain 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 April 2024.

How much traffic does I-75 NB|US-23 NB over Sunsmith Drain carry?

About 27,470 vehicles per day (2007 count), of which roughly 9% are trucks.

How long is I-75 NB|US-23 NB over Sunsmith Drain?

The structure is 22 ft (6.8 m) long with a longest span of 10 ft (3.2 m).

Who owns I-75 NB|US-23 NB over Sunsmith Drain?

It is owned by the State Highway Agency.