US Bridges

Willow RD over US-23

Fair

Washtenaw County, Michigan · 2.1 MI N of Monroe Col · Structure no. 000000000010892

Built
1962
63 years old
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
209 ft
4 main spans
Daily traffic
2,525
2020 count
Owner
State
State Highway Agency

About this bridge

Willow RD over US-23 is a prestressed concrete stringer/multi-beam or girder carrying Willow RD over US-23 in Washtenaw County, Michigan. It was built in 1962, 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 2,525 vehicles a day, roughly 3% of them trucks, projected to reach 3,650 by 2040. The structure is 209 ft (63.6 m) long and 31 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesWillow RD
CrossesUS-23
Location2.1 MI N of Monroe Col
RouteCounty Highway 0
CountyWashtenaw County
StateMichigan
Coordinates42.11315, -83.68231
Functional classRural 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment7: Better than present minimum criteria
Operating rating79.7 US tons
Inventory rating47.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length209 ft (63.6 m)
Longest span70 ft (21.2 m)
Deck width31 ft (9.4 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,525 (2020)
Projected traffic3,650 by 2040
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.1 mi (5 km)
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 Willow RD over US-23 built?

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

What condition is Willow 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 Willow RD over US-23 carry?

About 2,525 vehicles per day (2020 count), of which roughly 3% are trucks.

How long is Willow RD over US-23?

The structure is 209 ft (63.6 m) long with a longest span of 70 ft (21.2 m) and a deck 31 ft wide.

Who owns Willow RD over US-23?

It is owned by the State Highway Agency.