US Bridges

Willis RD over US-23

Fair

Washtenaw County, Michigan · 3.5 MI S of US-12 · Structure no. 000000000010894

Built
1962
63 years old, rebuilt 2023
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
252 ft
4 main spans
Daily traffic
3,800
2020 count
Owner
State
State Highway Agency

About this bridge

Willis RD over US-23 is a steel stringer/multi-beam or girder carrying Willis RD over US-23 in Washtenaw County, Michigan. It was built in 1962 and reconstructed in 2023, so it is 63 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.

It carries about 3,800 vehicles a day, roughly 3% of them trucks, projected to reach 4,575 by 2040. The structure is 252 ft (76.8 m) long and 35 ft wide.

Location

Open in Google Maps
CarriesWillis RD
CrossesUS-23
Location3.5 MI S of US-12
RouteCounty Highway 8120
CountyWashtenaw County
StateMichigan
Coordinates42.15687, -83.68385
Functional classRural Major 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
Deck9 ExcellentNo problems noted.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating95 US tons
Inventory rating56.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length252 ft (76.8 m)
Longest span80 ft (24.5 m)
Deck width35 ft (10.6 m)
Roadway width32 ft (9.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,800 (2020)
Projected traffic4,575 by 2040
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemNo

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 Willis RD over US-23 built?

It was built in 1962, making it 63 years old in 2025. It was reconstructed in 2023.

What condition is Willis RD over US-23 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 April 2024.

How much traffic does Willis RD over US-23 carry?

About 3,800 vehicles per day (2020 count), of which roughly 3% are trucks.

How long is Willis RD over US-23?

The structure is 252 ft (76.8 m) long with a longest span of 80 ft (24.5 m) and a deck 35 ft wide.

Who owns Willis RD over US-23?

It is owned by the State Highway Agency.