US Bridges

Ann Arbor Road over Bear Swamp Creek

Fair

Monroe County, Michigan · 3.95 MI N of M 50 · Structure no. 000000000007257

Built
1947
78 years old, rebuilt 2003
Condition
Fair
inspected August 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
35 ft
1 main span
Daily traffic
2,766
2017 count
Owner
County
County Highway Agency

About this bridge

Ann Arbor Road over Bear Swamp Creek is a prestressed concrete box beam or girders - multiple carrying Ann Arbor Road over Bear Swamp Creek in Monroe County, Michigan. It was built in 1947 and reconstructed in 2003, so it is 78 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 2,766 vehicles a day, roughly 15% of them trucks, projected to reach 3,181 by 2037. The structure is 35 ft (10.7 m) long and 47 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

CarriesAnn Arbor Road
CrossesBear Swamp Creek
Location3.95 MI N of M 50
RouteCounty Highway 5817
Coordinates42.01409, -83.67396
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating77.2 US tons
Inventory rating46.1 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length35 ft (10.7 m)
Longest span33 ft (10 m)
Deck width47 ft (14.4 m)
Roadway width45 ft (13.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,766 (2017)
Projected traffic3,181 by 2037
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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 Ann Arbor Road over Bear Swamp Creek built?

It was built in 1947, making it 78 years old in 2025. It was reconstructed in 2003.

What condition is Ann Arbor Road over Bear Swamp Creek 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 August 2023.

How much traffic does Ann Arbor Road over Bear Swamp Creek carry?

About 2,766 vehicles per day (2017 count), of which roughly 15% are trucks.

How long is Ann Arbor Road over Bear Swamp Creek?

The structure is 35 ft (10.7 m) long with a longest span of 33 ft (10 m) and a deck 47 ft wide.

Who owns Ann Arbor Road over Bear Swamp Creek?

It is owned by the County Highway Agency.