US Bridges

Maple ST over Au Sable River

Fair

Crawford County, Michigan · 0.3 MI N of M-72 · Structure no. 000000000014265

Built
1975
50 years old, rebuilt 1994
Condition
Fair
inspected June 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
60 ft
1 main span
Daily traffic
2,000
2018 count
Owner
City
City or Municipal Highway Agency

About this bridge

Maple ST over Au Sable River is a prestressed concrete box beam or girders - multiple carrying Maple ST over Au Sable River in Crawford County, Michigan. It was built in 1975 and reconstructed in 1994, so it is 50 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 6 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 2,000 vehicles a day, roughly 1% of them trucks, projected to reach 2,300 by 2038. The structure is 60 ft (18.3 m) long and 47 ft wide.

CarriesMaple ST
CrossesAu Sable River
Location0.3 MI N of M-72
RouteCity Street 0
Coordinates44.6611, -84.7082
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating65.7 US tons
Inventory rating39.2 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length60 ft (18.3 m)
Longest span58 ft (17.7 m)
Deck width47 ft (14.4 m)
Roadway width39 ft (11.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,000 (2018)
Projected traffic2,300 by 2038
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Maple ST over Au Sable River built?

It was built in 1975, making it 50 years old in 2025. It was reconstructed in 1994.

What condition is Maple ST over Au Sable 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 June 2024.

How much traffic does Maple ST over Au Sable River carry?

About 2,000 vehicles per day (2018 count), of which roughly 1% are trucks.

How long is Maple ST over Au Sable River?

The structure is 60 ft (18.3 m) long with a longest span of 58 ft (17.7 m) and a deck 47 ft wide.

Who owns Maple ST over Au Sable River?

It is owned by the City or Municipal Highway Agency.