US Bridges

Seven Mile Road over Saganing River

Fair

Bay County, Michigan · 1.1 MI S of Worth Road · Structure no. 000000000013977

Built
1967
58 years old
Condition
Fair
inspected May 2023
Type
Culvert
Concrete
Length
29 ft
2 main spans
Daily traffic
50
2017 count
Owner
County
County Highway Agency

About this bridge

Seven Mile Road over Saganing River is a concrete culvert carrying Seven Mile Road over Saganing River in Bay County, Michigan. It was built in 1967, so it is 58 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 50 vehicles a day, projected to reach 100 by 2037. The structure is 29 ft (8.8 m) long. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesSeven Mile Road
CrossesSaganing River
Location1.1 MI S of Worth Road
RouteCounty Highway 929
CountyBay County
StateMichigan
Coordinates43.90933, -84.02584
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMay 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
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating60.1 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadUnknown
Structure length29 ft (8.8 m)
Longest span14 ft (4.3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2017)
Projected traffic100 by 2037
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 Seven Mile Road over Saganing River built?

It was built in 1967, making it 58 years old in 2025.

What condition is Seven Mile Road over Saganing 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 May 2023.

How much traffic does Seven Mile Road over Saganing River carry?

About 50 vehicles per day (2017 count).

How long is Seven Mile Road over Saganing River?

The structure is 29 ft (8.8 m) long with a longest span of 14 ft (4.3 m).

Who owns Seven Mile Road over Saganing River?

It is owned by the County Highway Agency.