US Bridges

County RD 557 over Big West River

Good

Marquette County, Michigan · 7 Miles No of Mashek · Structure no. 000000000006525

Built
2018
7 years old
Condition
Good
inspected October 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
76 ft
1 main span
Daily traffic
357
2017 count
Owner
County
County Highway Agency

About this bridge

County RD 557 over Big West River is a prestressed concrete stringer/multi-beam or girder carrying County RD 557 over Big West River in Marquette County, Michigan. It was built in 2018, so it is 7 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 357 vehicles a day, roughly 15% of them trucks, projected to reach 500 by 2037. The structure is 76 ft (23.2 m) long and 43 ft wide. If it were closed, the detour would be 29.8 mi (48 km).

Location

Open in Google Maps
CarriesCounty RD 557
CrossesBig West River
Location7 Miles No of Mashek
RouteCounty Highway 5271
CountyMarquette County
StateMichigan
Coordinates46.14665, -87.46254
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 protection8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating64.6 US tons
Inventory rating36.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadGreater than HL 93
Structure length76 ft (23.2 m)
Longest span73 ft (22.1 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic357 (2017)
Projected traffic500 by 2037
Trucks15%
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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$95,000
NavigationNo navigation control on waterway

Frequently asked questions

When was County RD 557 over Big West River built?

It was built in 2018, making it 7 years old in 2025.

What condition is County RD 557 over Big West 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 October 2024.

How much traffic does County RD 557 over Big West River carry?

About 357 vehicles per day (2017 count), of which roughly 15% are trucks.

How long is County RD 557 over Big West River?

The structure is 76 ft (23.2 m) long with a longest span of 73 ft (22.1 m) and a deck 43 ft wide.

Who owns County RD 557 over Big West River?

It is owned by the County Highway Agency.