US Bridges

County Road 550 over Big Garlic River

Good

Marquette County, Michigan · 3 Miles West of Buckroe · Structure no. 000000000006561

Built
2015
10 years old
Condition
Good
inspected July 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
60 ft
1 main span
Daily traffic
1,900
2014 count
Owner
County
County Highway Agency

About this bridge

County Road 550 over Big Garlic River is a prestressed concrete box beam or girders - multiple carrying County Road 550 over Big Garlic River in Marquette County, Michigan. It was built in 2015, so it is 10 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,900 vehicles a day, roughly 11% of them trucks, projected to reach 2,100 by 2034. The structure is 60 ft (18.3 m) long and 44 ft wide. If it were closed, the detour would be 29.8 mi (48 km).

Location

Open in Google Maps
CarriesCounty Road 550
CrossesBig Garlic River
Location3 Miles West of Buckroe
RouteCounty Highway 5283
CountyMarquette County
StateMichigan
Coordinates46.68319, -87.56997
Functional classRural Major Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66 US tons
Inventory rating51 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadGreater than HL 93
Structure length60 ft (18.3 m)
Longest span59 ft (17.9 m)
Deck width44 ft (13.4 m)
Roadway width41 ft (12.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,900 (2014)
Projected traffic2,100 by 2034
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed29.8 mi (48 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 County Road 550 over Big Garlic River built?

It was built in 2015, making it 10 years old in 2025.

What condition is County Road 550 over Big Garlic River 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 July 2023.

How much traffic does County Road 550 over Big Garlic River carry?

About 1,900 vehicles per day (2014 count), of which roughly 11% are trucks.

How long is County Road 550 over Big Garlic River?

The structure is 60 ft (18.3 m) long with a longest span of 59 ft (17.9 m) and a deck 44 ft wide.

Who owns County Road 550 over Big Garlic River?

It is owned by the County Highway Agency.