US Bridges

M-13 over Flint R

Good

Saginaw County, Michigan · 7.2 MI S of M-46 · Structure no. 000000000009079

Built
2016
9 years old
Condition
Good
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
440 ft
3 main spans
Daily traffic
6,275
2012 count
Owner
State
State Highway Agency

About this bridge

M-13 over Flint R is a steel continuous stringer/multi-beam or girder carrying M-13 over Flint R in Saginaw County, Michigan. It was built in 2016, so it is 9 years old, younger than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 6,275 vehicles a day, roughly 6% of them trucks, projected to reach 7,000 by 2034. The structure is 440 ft (134.1 m) long and 46 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesM-13
CrossesFlint R
Location7.2 MI S of M-46
RouteState Highway 13
CountySaginaw County
StateMichigan
Coordinates43.30848, -83.95323
Functional classRural Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure9 ExcellentNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating55.3 US tons
Inventory rating42.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadGreater than HL 93
Structure length440 ft (134.1 m)
Longest span180 ft (54.9 m)
Deck width46 ft (14.1 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,275 (2012)
Projected traffic7,000 by 2034
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
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 proposedDeck replacement with only incidental widening
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was M-13 over Flint R built?

It was built in 2016, making it 9 years old in 2025.

What condition is M-13 over Flint R in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in July 2023.

How much traffic does M-13 over Flint R carry?

About 6,275 vehicles per day (2012 count), of which roughly 6% are trucks.

How long is M-13 over Flint R?

The structure is 440 ft (134.1 m) long with a longest span of 180 ft (54.9 m) and a deck 46 ft wide.

Who owns M-13 over Flint R?

It is owned by the State Highway Agency.