US Bridges

M-81 Washington ST over I-75

Good

Saginaw County, Michigan · @ M-81 · Structure no. 000000000009164

Built
2006
19 years old
Condition
Good
inspected February 2025
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
195 ft
2 main spans
Daily traffic
16,400
2005 count
Owner
State
State Highway Agency

About this bridge

M-81 Washington ST over I-75 is a steel continuous stringer/multi-beam or girder carrying M-81 Washington ST over I-75 in Saginaw County, Michigan. It was built in 2006, so it is 19 years old, younger than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 16,400 vehicles a day, roughly 8% of them trucks, projected to reach 29,620 by 2025. The structure is 195 ft (59.3 m) long and 51 ft wide.

Location

Open in Google Maps
CarriesM-81 Washington ST
CrossesI-75
Location@ M-81
RouteState Highway 81
CountySaginaw County
StateMichigan
Coordinates43.45063, -83.89067
Functional classUrban Other Principal Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating90.7 US tons
Inventory rating54.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 25 or greater
Structure length195 ft (59.3 m)
Longest span96 ft (29.2 m)
Deck width51 ft (15.6 m)
Roadway width48 ft (14.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic16,400 (2005)
Projected traffic29,620 by 2025
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was M-81 Washington ST over I-75 built?

It was built in 2006, making it 19 years old in 2025.

What condition is M-81 Washington ST over I-75 in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in February 2025.

How much traffic does M-81 Washington ST over I-75 carry?

About 16,400 vehicles per day (2005 count), of which roughly 8% are trucks.

How long is M-81 Washington ST over I-75?

The structure is 195 ft (59.3 m) long with a longest span of 96 ft (29.2 m) and a deck 51 ft wide.

Who owns M-81 Washington ST over I-75?

It is owned by the State Highway Agency.