US Bridges

Saginaw Road over South Br. Flint River

Good

Lapeer County, Michigan · Sec. 28-29 Mayfield Twp. · Structure no. 000000000005389

Built
1935
90 years old, rebuilt 2021
Condition
Good
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
41 ft
1 main span
Daily traffic
5,200
2021 count
Owner
County
County Highway Agency

About this bridge

Saginaw Road over South Br. Flint River is a steel stringer/multi-beam or girder carrying Saginaw Road over South Br. Flint River in Lapeer County, Michigan. It was built in 1935 and reconstructed in 2021, so it is 90 years old, older 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 5,200 vehicles a day, roughly 10% of them trucks, projected to reach 9,392 by 2041. The structure is 41 ft (12.6 m) long and 40 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesSaginaw Road
CrossesSouth Br. Flint River
LocationSec. 28-29 Mayfield Twp.
RouteCounty Highway 4433
CountyLapeer County
StateMichigan
Coordinates43.07871, -83.30679
Functional classUrban 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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation8: Equal to present desirable 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 alignment7: Better than present minimum criteria
Operating rating57.5 US tons
Inventory rating44.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length41 ft (12.6 m)
Longest span37 ft (11.2 m)
Deck width40 ft (12.3 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,200 (2021)
Projected traffic9,392 by 2041
Trucks10%
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

OwnerCounty Highway Agency
Maintained byCounty 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 Saginaw Road over South Br. Flint River built?

It was built in 1935, making it 90 years old in 2025. It was reconstructed in 2021.

What condition is Saginaw Road over South Br. Flint River 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 September 2023.

How much traffic does Saginaw Road over South Br. Flint River carry?

About 5,200 vehicles per day (2021 count), of which roughly 10% are trucks.

How long is Saginaw Road over South Br. Flint River?

The structure is 41 ft (12.6 m) long with a longest span of 37 ft (11.2 m) and a deck 40 ft wide.

Who owns Saginaw Road over South Br. Flint River?

It is owned by the County Highway Agency.