US Bridges

M-46 EB over Swan Creek

Fair

Saginaw County, Michigan · 1.6 MI E of M-52 · Structure no. 000000000009092

Built
1958
67 years old, rebuilt 2015
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
155 ft
3 main spans
Daily traffic
9,350
2014 count
Owner
State
State Highway Agency

About this bridge

M-46 EB over Swan Creek is a steel stringer/multi-beam or girder carrying M-46 EB over Swan Creek in Saginaw County, Michigan. It was built in 1958 and reconstructed in 2015, so it is 67 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 9,350 vehicles a day, roughly 4% of them trucks, projected to reach 10,325 by 2034. The structure is 155 ft (47.2 m) long and 39 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesM-46 EB
CrossesSwan Creek
Location1.6 MI E of M-52
RouteState Highway 46
CountySaginaw County
StateMichigan
Coordinates43.41597, -84.09635
Functional classUrban Other Principal 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2023
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 geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating70 US tons
Inventory rating41.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length155 ft (47.2 m)
Longest span65 ft (19.8 m)
Deck width39 ft (12 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,350 (2014)
Projected traffic10,325 by 2034
Trucks4%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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-46 EB over Swan Creek built?

It was built in 1958, making it 67 years old in 2025. It was reconstructed in 2015.

What condition is M-46 EB over Swan Creek 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 August 2023.

How much traffic does M-46 EB over Swan Creek carry?

About 9,350 vehicles per day (2014 count), of which roughly 4% are trucks.

How long is M-46 EB over Swan Creek?

The structure is 155 ft (47.2 m) long with a longest span of 65 ft (19.8 m) and a deck 39 ft wide.

Who owns M-46 EB over Swan Creek?

It is owned by the State Highway Agency.