US Bridges

Seven Mile RD over US-10

Fair

Bay County, Michigan · 6.0 MI W of Bay City · Structure no. 000000000000667

Built
1958
67 years old
Condition
Fair
inspected June 2023
Type
Tee Beam
Concrete Continuous
Length
183 ft
4 main spans
Daily traffic
1,869
1997 count
Owner
State
State Highway Agency

About this bridge

Seven Mile RD over US-10 is a concrete continuous tee beam carrying Seven Mile RD over US-10 in Bay County, Michigan. It was built in 1958, so it is 67 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 1,869 vehicles a day, roughly 3% of them trucks, projected to reach 580 by 1977. The structure is 183 ft (55.7 m) long and 33 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesSeven Mile RD
CrossesUS-10
Location6.0 MI W of Bay City
RouteCounty Highway 929
CountyBay County
StateMichigan
Coordinates43.59666, -84.03193
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
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
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 geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating54.2 US tons
Inventory rating32.5 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadH 15
Structure length183 ft (55.7 m)
Longest span54 ft (16.4 m)
Deck width33 ft (10.1 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,869 (1997)
Projected traffic580 by 1977
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed6.2 mi (10 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$78,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was Seven Mile RD over US-10 built?

It was built in 1958, making it 67 years old in 2025.

What condition is Seven Mile RD over US-10 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 June 2023.

How much traffic does Seven Mile RD over US-10 carry?

About 1,869 vehicles per day (1997 count), of which roughly 3% are trucks.

How long is Seven Mile RD over US-10?

The structure is 183 ft (55.7 m) long with a longest span of 54 ft (16.4 m) and a deck 33 ft wide.

Who owns Seven Mile RD over US-10?

It is owned by the State Highway Agency.