US Bridges

M-77 over E Br Fox River

Fair

Schoolcraft County, Michigan · 4.1 MI N of M-28 · Structure no. 000000000009688

Built
1953
72 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
59 ft
1 main span
Daily traffic
406
2007 count
Owner
State
State Highway Agency

About this bridge

M-77 over E Br Fox River is a steel stringer/multi-beam or girder carrying M-77 over E Br Fox River in Schoolcraft County, Michigan. It was built in 1953, so it is 72 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 406 vehicles a day, roughly 14% of them trucks, projected to reach 651 by 2018. The structure is 59 ft (17.9 m) long and 33 ft wide. If it were closed, the detour would be 29.2 mi (47 km).

Location

Open in Google Maps
CarriesM-77
CrossesE Br Fox River
Location4.1 MI N of M-28
RouteState Highway 77
CountySchoolcraft County
StateMichigan
Coordinates46.40545, -85.9479
Functional classRural Minor Arterial

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating94.2 US tons
Inventory rating56.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length59 ft (17.9 m)
Longest span56 ft (17.2 m)
Deck width33 ft (10.2 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic406 (2007)
Projected traffic651 by 2018
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed29.2 mi (47 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was M-77 over E Br Fox River built?

It was built in 1953, making it 72 years old in 2025.

What condition is M-77 over E Br Fox 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 August 2023.

How much traffic does M-77 over E Br Fox River carry?

About 406 vehicles per day (2007 count), of which roughly 14% are trucks.

How long is M-77 over E Br Fox River?

The structure is 59 ft (17.9 m) long with a longest span of 56 ft (17.2 m) and a deck 33 ft wide.

Who owns M-77 over E Br Fox River?

It is owned by the State Highway Agency.