US Bridges

M-77 over W Br Sucker River

Fair

Alger County, Michigan · 6.2 MI S of Grand Marais · Structure no. 000000000000053

Built
1928
97 years old
Condition
Fair
inspected August 2023
Type
Tee Beam
Concrete
Length
23 ft
1 main span
Daily traffic
406
2007 count
Owner
State
State Highway Agency

About this bridge

M-77 over W Br Sucker River is a concrete tee beam carrying M-77 over W Br Sucker River in Alger County, Michigan. It was built in 1928, so it is 97 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 406 vehicles a day, roughly 14% of them trucks, projected to reach 651 by 2018. The structure is 23 ft (7 m) long and 34 ft wide. If it were closed, the detour would be 24.2 mi (39 km).

Location

Open in Google Maps
CarriesM-77
CrossesW Br Sucker River
Location6.2 MI S of Grand Marais
RouteState Highway 77
CountyAlger County
StateMichigan
Coordinates46.5899, -86.00881
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
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating66.5 US tons
Inventory rating39.7 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length23 ft (7 m)
Longest span23 ft (7 m)
Deck width34 ft (10.5 m)
Roadway width31 ft (9.4 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 closed24.2 mi (39 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 W Br Sucker River built?

It was built in 1928, making it 97 years old in 2025.

What condition is M-77 over W Br Sucker 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 W Br Sucker River carry?

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

How long is M-77 over W Br Sucker River?

The structure is 23 ft (7 m) long with a longest span of 23 ft (7 m) and a deck 34 ft wide.

Who owns M-77 over W Br Sucker River?

It is owned by the State Highway Agency.