US Bridges

County RD 601 over Michigamme River

Fair

Marquette County, Michigan · In Republic · Structure no. 000000000006530

Built
1911
114 years old, rebuilt 1985
Condition
Fair
inspected October 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
147 ft
2 main spans
Daily traffic
81
2023 count
Owner
County
County Highway Agency

About this bridge

County RD 601 over Michigamme River is a prestressed concrete box beam or girders - multiple carrying County RD 601 over Michigamme River in Marquette County, Michigan. It was built in 1911 and reconstructed in 1985, so it is 114 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 81 vehicles a day. The structure is 147 ft (44.8 m) long and 34 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesCounty RD 601
CrossesMichigamme River
LocationIn Republic
RouteCounty Highway 0
CountyMarquette County
StateMichigan
Coordinates46.40634, -87.98192
Functional classRural Major Collector

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 protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation*: *
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating—
Inventory rating—

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans2
Design loadHS 20 + Mod
Structure length147 ft (44.8 m)
Longest span72 ft (21.9 m)
Deck width34 ft (10.4 m)
Roadway width34 ft (10.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic81 (2023)
Projected traffic—
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 RD 601 over Michigamme River built?

It was built in 1911, making it 114 years old in 2025. It was reconstructed in 1985.

What condition is County RD 601 over Michigamme 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 October 2024.

How much traffic does County RD 601 over Michigamme River carry?

About 81 vehicles per day (2023 count).

How long is County RD 601 over Michigamme River?

The structure is 147 ft (44.8 m) long with a longest span of 72 ft (21.9 m) and a deck 34 ft wide.

Who owns County RD 601 over Michigamme River?

It is owned by the County Highway Agency.