US Bridges

I-75 NB over Kochville Drain

Fair

Saginaw County, Michigan · 1.0 MI S of Bay CO Line · Structure no. 000000000009166

Built
1960
65 years old, rebuilt 2017
Condition
Fair
inspected October 2024
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete
Length
52 ft
1 main span
Daily traffic
25,430
2014 count
Owner
State
State Highway Agency

About this bridge

I-75 NB over Kochville Drain is a prestressed concrete box beam or girders - single or spread carrying I-75 NB over Kochville Drain in Saginaw County, Michigan. It was built in 1960 and reconstructed in 2017, so it is 65 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 25,430 vehicles a day, roughly 6% of them trucks, projected to reach 58,489 by 2034. The structure is 52 ft (15.8 m) long and 61 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-75 NB
CrossesKochville Drain
Location1.0 MI S of Bay CO Line
RouteInterstate 75
CountySaginaw County
StateMichigan
Coordinates43.50629, -83.93302
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61.4 US tons
Inventory rating47.2 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadGreater than HL 93
Structure length52 ft (15.8 m)
Longest span49 ft (15 m)
Deck width61 ft (18.6 m)
Roadway width58 ft (17.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic25,430 (2014)
Projected traffic58,489 by 2034
Trucks6%
Lanes on structure3
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-75 NB over Kochville Drain built?

It was built in 1960, making it 65 years old in 2025. It was reconstructed in 2017.

What condition is I-75 NB over Kochville 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 October 2024.

How much traffic does I-75 NB over Kochville Drain carry?

About 25,430 vehicles per day (2014 count), of which roughly 6% are trucks.

How long is I-75 NB over Kochville Drain?

The structure is 52 ft (15.8 m) long with a longest span of 49 ft (15 m) and a deck 61 ft wide.

Who owns I-75 NB over Kochville Drain?

It is owned by the State Highway Agency.