US Bridges

Capac Road over I-69

Fair

St. Clair County, Michigan · 2.5 MI S of Capac · Structure no. 000000000009948

Built
1979
46 years old
Condition
Fair
inspected December 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
270 ft
2 main spans
Daily traffic
5,850
1990 count
Owner
State
State Highway Agency

About this bridge

Capac Road over I-69 is a steel continuous stringer/multi-beam or girder carrying Capac Road over I-69 in St. Clair County, Michigan. It was built in 1979, so it is 46 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 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 5,850 vehicles a day, roughly 4% of them trucks, projected to reach 6,728 by 2010. The structure is 270 ft (82.3 m) long and 46 ft wide.

Location

Open in Google Maps
CarriesCapac Road
CrossesI-69
Location2.5 MI S of Capac
RouteCounty Highway 7707
CountySt. Clair County
StateMichigan
Coordinates42.9865, -82.92773
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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating85.3 US tons
Inventory rating51 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadH 20
Structure length270 ft (82.3 m)
Longest span137 ft (41.7 m)
Deck width46 ft (13.9 m)
Roadway width43 ft (13.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,850 (1990)
Projected traffic6,728 by 2010
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Capac Road over I-69 built?

It was built in 1979, making it 46 years old in 2025.

What condition is Capac Road over I-69 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 December 2023.

How much traffic does Capac Road over I-69 carry?

About 5,850 vehicles per day (1990 count), of which roughly 4% are trucks.

How long is Capac Road over I-69?

The structure is 270 ft (82.3 m) long with a longest span of 137 ft (41.7 m) and a deck 46 ft wide.

Who owns Capac Road over I-69?

It is owned by the State Highway Agency.