US Bridges

CR 601 over Black River

Good

Marquette County, Michigan · 0.75 MI N of CR 478 · Structure no. 000000000014291

Built
2018
7 years old
Condition
Good
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
34 ft
1 main span
Daily traffic
83
2016 count
Owner
County
County Highway Agency

About this bridge

CR 601 over Black River is a steel stringer/multi-beam or girder carrying CR 601 over Black 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 83 vehicles a day, projected to reach 95 by 2036. The structure is 34 ft (10.4 m) long and 14 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

Location

Open in Google Maps
CarriesCR 601
CrossesBlack River
Location0.75 MI N of CR 478
RouteCounty Highway 5211
CountyMarquette County
StateMichigan
Coordinates46.44365, -87.93565
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating107.1 US tons
Inventory rating107.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckOpen grating
Main spans1
Design loadGreater than HL 93
Structure length34 ft (10.4 m)
Longest span25 ft (7.7 m)
Deck width14 ft (4.2 m)
Roadway width13 ft (4.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic83 (2016)
Projected traffic95 by 2036
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.9 mi (24 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 CR 601 over Black River built?

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

What condition is CR 601 over Black 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 2024.

How much traffic does CR 601 over Black River carry?

About 83 vehicles per day (2016 count).

How long is CR 601 over Black River?

The structure is 34 ft (10.4 m) long with a longest span of 25 ft (7.7 m) and a deck 14 ft wide.

Who owns CR 601 over Black River?

It is owned by the County Highway Agency.