US Bridges

M-14 WB over Earhart RD

Fair

Washtenaw County, Michigan · 0.5 MI E of US-23 · Structure no. 000000000010919

Built
1964
61 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
109 ft
3 main spans
Daily traffic
29,770
2007 count
Owner
State
State Highway Agency

About this bridge

M-14 WB over Earhart RD is a prestressed concrete stringer/multi-beam or girder carrying M-14 WB over Earhart RD in Washtenaw County, Michigan. It was built in 1964, so it is 61 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 29,770 vehicles a day, roughly 10% of them trucks, projected to reach 27,352 by 2018. The structure is 109 ft (33.2 m) long and 55 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesM-14 WB
CrossesEarhart RD
Location0.5 MI E of US-23
RouteState Highway 14
CountyWashtenaw County
StateMichigan
Coordinates42.32472, -83.68345
Functional classUrban Principal Arterial - Other Freeway or Expressway

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
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 rating76.4 US tons
Inventory rating45.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length109 ft (33.2 m)
Longest span41 ft (12.6 m)
Deck width55 ft (16.9 m)
Roadway width52 ft (15.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic29,770 (2007)
Projected traffic27,352 by 2018
Trucks10%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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 M-14 WB over Earhart RD built?

It was built in 1964, making it 61 years old in 2025.

What condition is M-14 WB over Earhart RD 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 September 2024.

How much traffic does M-14 WB over Earhart RD carry?

About 29,770 vehicles per day (2007 count), of which roughly 10% are trucks.

How long is M-14 WB over Earhart RD?

The structure is 109 ft (33.2 m) long with a longest span of 41 ft (12.6 m) and a deck 55 ft wide.

Who owns M-14 WB over Earhart RD?

It is owned by the State Highway Agency.