US Bridges

County Route 510 over Yellow Dog River

Fair

Marquette County, Michigan · 6 MI South of Big Bay · Structure no. 000000000006556

Built
1973
52 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
70 ft
1 main span
Daily traffic
314
2001 count
Owner
County
County Highway Agency

About this bridge

County Route 510 over Yellow Dog River is a steel stringer/multi-beam or girder carrying County Route 510 over Yellow Dog River in Marquette County, Michigan. It was built in 1973, so it is 52 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 5 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 314 vehicles a day, projected to reach 320 by 2020. The structure is 70 ft (21.3 m) long and 24 ft wide. If it were closed, the detour would be 28 mi (45 km).

Location

Open in Google Maps
CarriesCounty Route 510
CrossesYellow Dog River
Location6 MI South of Big Bay
RouteCounty Highway 0
CountyMarquette County
StateMichigan
Coordinates46.72663, -87.71496
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
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating29.3 US tons
Inventory rating22.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckWood or timber
Main spans1
Design loadHS 20 + Mod
Structure length70 ft (21.3 m)
Longest span69 ft (21 m)
Deck width24 ft (7.3 m)
Roadway width23 ft (7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic314 (2001)
Projected traffic320 by 2020
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed28 mi (45 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$20,000 (2050 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was County Route 510 over Yellow Dog River built?

It was built in 1973, making it 52 years old in 2025.

What condition is County Route 510 over Yellow Dog 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 Route 510 over Yellow Dog River carry?

About 314 vehicles per day (2001 count).

How long is County Route 510 over Yellow Dog River?

The structure is 70 ft (21.3 m) long with a longest span of 69 ft (21 m) and a deck 24 ft wide.

Who owns County Route 510 over Yellow Dog River?

It is owned by the County Highway Agency.