US Bridges

M-29 over Swan Creek

Fair

St. Clair County, Michigan · 3.9 MI SE of Macomb Col · Structure no. 000000000009968

Built
1932
93 years old, rebuilt 1973
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
58 ft
1 main span
Daily traffic
14,431
2007 count
Owner
State
State Highway Agency

About this bridge

M-29 over Swan Creek is a steel stringer/multi-beam or girder carrying M-29 over Swan Creek in St. Clair County, Michigan. It was built in 1932 and reconstructed in 1973, so it is 93 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 14,431 vehicles a day, roughly 2% of them trucks, projected to reach 17,903 by 2018. The structure is 58 ft (17.7 m) long and 54 ft wide.

Location

Open in Google Maps
CarriesM-29
CrossesSwan Creek
Location3.9 MI SE of Macomb Col
RouteState Highway 29
CountySt. Clair County
StateMichigan
Coordinates42.68029, -82.65778
Functional classRural Minor 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.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2023
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
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating75 US tons
Inventory rating57.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length58 ft (17.7 m)
Longest span54 ft (16.6 m)
Deck width54 ft (16.6 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,431 (2007)
Projected traffic17,903 by 2018
Trucks2%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemNo

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-29 over Swan Creek built?

It was built in 1932, making it 93 years old in 2025. It was reconstructed in 1973.

What condition is M-29 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 March 2023.

How much traffic does M-29 over Swan Creek carry?

About 14,431 vehicles per day (2007 count), of which roughly 2% are trucks.

How long is M-29 over Swan Creek?

The structure is 58 ft (17.7 m) long with a longest span of 54 ft (16.6 m) and a deck 54 ft wide.

Who owns M-29 over Swan Creek?

It is owned by the State Highway Agency.