US Bridges

Superior Road over Huron River

Fair

Washtenaw County, Michigan · Ypsilanti Twp Section 5 · Structure no. 000000000011006

Built
1973
52 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
175 ft
3 main spans
Daily traffic
4,169
2016 count
Owner
County
County Highway Agency

About this bridge

Superior Road over Huron River is a steel stringer/multi-beam or girder carrying Superior Road over Huron River in Washtenaw County, Michigan. It was built in 1973, so it is 52 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 4,169 vehicles a day, roughly 1% of them trucks, projected to reach 4,321 by 2036. The structure is 175 ft (53.4 m) long and 64 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesSuperior Road
CrossesHuron River
LocationYpsilanti Twp Section 5
RouteCounty Highway 2006
CountyWashtenaw County
StateMichigan
Coordinates42.26047, -83.63857
Functional classUrban 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating75 US tons
Inventory rating45 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length175 ft (53.4 m)
Longest span58 ft (17.6 m)
Deck width64 ft (19.4 m)
Roadway width51 ft (15.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,169 (2016)
Projected traffic4,321 by 2036
Trucks1%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
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 statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.5 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Superior Road over Huron River built?

It was built in 1973, making it 52 years old in 2025.

What condition is Superior 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 September 2023.

How much traffic does Superior Road over Huron River carry?

About 4,169 vehicles per day (2016 count), of which roughly 1% are trucks.

How long is Superior Road over Huron River?

The structure is 175 ft (53.4 m) long with a longest span of 58 ft (17.6 m) and a deck 64 ft wide.

Who owns Superior Road over Huron River?

It is owned by the County Highway Agency.