US Bridges

Maple Road over Huron River

FairPosted for load

Washtenaw County, Michigan · Ann Arbor Twp Sec 7 · Structure no. 000000000011030

Built
1876
149 years old, rebuilt 2003
Condition
Fair
inspected May 2024
Type
Truss - Thru
Steel
Length
150 ft
1 main span
Daily traffic
1,963
2004 count
Owner
County
County Highway Agency

About this bridge

Maple Road over Huron River is a steel truss - thru carrying Maple Road over Huron River in Washtenaw County, Michigan. It was built in 1876 and reconstructed in 2003, so it is 149 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. Its operating status is: posted for load restriction.

It carries about 1,963 vehicles a day, roughly 2% of them trucks, projected to reach 3,545 by 2024. The structure is 150 ft (45.7 m) long and 16 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesMaple Road
CrossesHuron River
LocationAnn Arbor Twp Sec 7
RouteCounty Highway 0
CountyWashtenaw County
StateMichigan
Coordinates42.31693, -83.77811
Functional classUrban 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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment2: Basically intolerable, requiring high priority of replacement
Operating rating25 US tons
Inventory rating15 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckWood or timber
Main spans1 (+2 approach)
Design loadHS 20 + Mod
Structure length150 ft (45.7 m)
Longest span120 ft (36.5 m)
Deck width16 ft (4.9 m)
Roadway width16 ft (4.9 m)
Vertical clearance over deck14 ft (4.3 m)

Traffic and service

Average daily traffic1,963 (2004)
Projected traffic3,545 by 2024
Trucks2%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusListed on the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$728,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Maple Road over Huron River built?

It was built in 1876, making it 149 years old in 2025. It was reconstructed in 2003.

What condition is Maple Road over Huron 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 May 2024.

How much traffic does Maple Road over Huron River carry?

About 1,963 vehicles per day (2004 count), of which roughly 2% are trucks.

How long is Maple Road over Huron River?

The structure is 150 ft (45.7 m) long with a longest span of 120 ft (36.5 m) and a deck 16 ft wide.

Who owns Maple Road over Huron River?

It is owned by the County Highway Agency.