US Bridges

Birch Run Road over Flint River

Fair

Saginaw County, Michigan · 0.1 MI E of Seymour Road · Structure no. 000000000009273

Built
1978
47 years old
Condition
Fair
inspected November 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
220 ft
3 main spans
Daily traffic
3,400
2018 count
Owner
County
County Highway Agency

About this bridge

Birch Run Road over Flint River is a steel continuous stringer/multi-beam or girder carrying Birch Run Road over Flint River in Saginaw County, Michigan. It was built in 1978, so it is 47 years old, younger 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 6 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 3,400 vehicles a day, roughly 5% of them trucks, projected to reach 3,570 by 2028. The structure is 220 ft (67 m) long and 41 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesBirch Run Road
CrossesFlint River
Location0.1 MI E of Seymour Road
RouteCounty Highway 7322
CountySaginaw County
StateMichigan
Coordinates43.24987, -83.87264
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating73.5 US tons
Inventory rating44 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length220 ft (67 m)
Longest span90 ft (27.4 m)
Deck width41 ft (12.6 m)
Roadway width39 ft (11.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,400 (2018)
Projected traffic3,570 by 2028
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Birch Run Road over Flint River built?

It was built in 1978, making it 47 years old in 2025.

What condition is Birch Run Road over Flint River 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 November 2023.

How much traffic does Birch Run Road over Flint River carry?

About 3,400 vehicles per day (2018 count), of which roughly 5% are trucks.

How long is Birch Run Road over Flint River?

The structure is 220 ft (67 m) long with a longest span of 90 ft (27.4 m) and a deck 41 ft wide.

Who owns Birch Run Road over Flint River?

It is owned by the County Highway Agency.