US Bridges

M-55 over E Br Au Gres River

Poor

Iosco County, Michigan · 4.0 MI E of M-65 · Structure no. 000000000004122

Built
1954
71 years old
Condition
Poor
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
177 ft
3 main spans
Daily traffic
3,110
2007 count
Owner
State
State Highway Agency

About this bridge

M-55 over E Br Au Gres River is a steel stringer/multi-beam or girder carrying M-55 over E Br Au Gres River in Iosco County, Michigan. It was built in 1954, so it is 71 years old, older than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 3,110 vehicles a day, roughly 9% of them trucks, projected to reach 3,767 by 2018. The structure is 177 ft (53.9 m) long and 33 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesM-55
CrossesE Br Au Gres River
Location4.0 MI E of M-65
RouteState Highway 55
CountyIosco County
StateMichigan
Coordinates44.2779, -83.72337
Functional classRural Minor Arterial

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating88.6 US tons
Inventory rating52.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length177 ft (53.9 m)
Longest span70 ft (21.3 m)
Deck width33 ft (10.2 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,110 (2007)
Projected traffic3,767 by 2018
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 proposedDeck replacement with only incidental widening
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was M-55 over E Br Au Gres River built?

It was built in 1954, making it 71 years old in 2025.

What condition is M-55 over E Br Au Gres River in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in July 2024.

How much traffic does M-55 over E Br Au Gres River carry?

About 3,110 vehicles per day (2007 count), of which roughly 9% are trucks.

How long is M-55 over E Br Au Gres River?

The structure is 177 ft (53.9 m) long with a longest span of 70 ft (21.3 m) and a deck 33 ft wide.

Who owns M-55 over E Br Au Gres River?

It is owned by the State Highway Agency.