US Bridges

M-13 over I-69

Fair

Genesee County, Michigan · @ Shiawassee CO Line · Structure no. 000000000002531

Built
1959
66 years old
Condition
Fair
inspected July 2024
Type
Tee Beam
Concrete Continuous
Length
226 ft
4 main spans
Daily traffic
8,600
2010 count
Owner
State
State Highway Agency

About this bridge

M-13 over I-69 is a concrete continuous tee beam carrying M-13 over I-69 in Genesee County, Michigan. It was built in 1959, so it is 66 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 8,600 vehicles a day, roughly 7% of them trucks, projected to reach 10,000 by 2031. The structure is 226 ft (68.9 m) long and 61 ft wide.

Location

Open in Google Maps
CarriesM-13
CrossesI-69
Location@ Shiawassee CO Line
RouteState Highway 13
CountyGenesee County
StateMichigan
Coordinates42.96439, -83.92886
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating71.8 US tons
Inventory rating45 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length226 ft (68.9 m)
Longest span71 ft (21.5 m)
Deck width61 ft (18.7 m)
Roadway width58 ft (17.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,600 (2010)
Projected traffic10,000 by 2031
Trucks7%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was M-13 over I-69 built?

It was built in 1959, making it 66 years old in 2025.

What condition is M-13 over I-69 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 July 2024.

How much traffic does M-13 over I-69 carry?

About 8,600 vehicles per day (2010 count), of which roughly 7% are trucks.

How long is M-13 over I-69?

The structure is 226 ft (68.9 m) long with a longest span of 71 ft (21.5 m) and a deck 61 ft wide.

Who owns M-13 over I-69?

It is owned by the State Highway Agency.