US Bridges

US-12BR M-17 over Huron River

Poor

Washtenaw County, Michigan · In Ypsilanti (e Mich Ave) · Structure no. 000000000010815

Built
1912
113 years old
Condition
Poor
inspected August 2024
Type
Arch - Deck
Concrete
Length
105 ft
1 main span
Daily traffic
18,300
2021 count
Owner
State
State Highway Agency

About this bridge

US-12BR M-17 over Huron River is a concrete arch - deck carrying US-12BR M-17 over Huron River in Washtenaw County, Michigan. It was built in 1912, so it is 113 years old, older than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 18,300 vehicles a day, roughly 2% of them trucks, projected to reach 19,700 by 2036. The structure is 105 ft (32 m) long and 81 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesUS-12BR M-17
CrossesHuron River
LocationIn Ypsilanti (e Mich Ave)
RouteU.S. Route 12
CountyWashtenaw County
StateMichigan
Coordinates42.24104, -83.6116
Functional classUrban Other Principal Arterial

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50 US tons
Inventory rating29.9 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length105 ft (32 m)
Longest span105 ft (32 m)
Deck width81 ft (24.7 m)
Roadway width66 ft (20.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic18,300 (2021)
Projected traffic19,700 by 2036
Trucks2%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was US-12BR M-17 over Huron River built?

It was built in 1912, making it 113 years old in 2025.

What condition is US-12BR M-17 over Huron River in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in August 2024.

How much traffic does US-12BR M-17 over Huron River carry?

About 18,300 vehicles per day (2021 count), of which roughly 2% are trucks.

How long is US-12BR M-17 over Huron River?

The structure is 105 ft (32 m) long with a longest span of 105 ft (32 m) and a deck 81 ft wide.

Who owns US-12BR M-17 over Huron River?

It is owned by the State Highway Agency.