US Bridges

County RD 480 over L S & I Railroad

FairPosted for load

Marquette County, Michigan · In Negaunee · Structure no. 000000000006545

Built
1968
57 years old, rebuilt 2015
Condition
Fair
inspected November 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
95 ft
1 main span
Daily traffic
4,000
2015 count
Owner
County
County Highway Agency

About this bridge

County RD 480 over L S & I Railroad is a steel stringer/multi-beam or girder carrying County RD 480 over L S & I Railroad in Marquette County, Michigan. It was built in 1968 and reconstructed in 2015, so it is 57 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. Its operating status is: posted for load restriction.

It carries about 4,000 vehicles a day, projected to reach 4,400 by 2035. The structure is 95 ft (29 m) long and 47 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesCounty RD 480
CrossesL S & I Railroad
LocationIn Negaunee
RouteCounty Highway 5278
CountyMarquette County
StateMichigan
Coordinates46.50255, -87.56672
Functional classUrban Minor Arterial

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.
Superstructure8 Very GoodNo problems noted.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating28.9 US tons
Inventory rating17.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length95 ft (29 m)
Longest span93 ft (28.4 m)
Deck width47 ft (14.3 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,000 (2015)
Projected traffic4,400 by 2035
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed3.1 mi (5 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was County RD 480 over L S & I Railroad built?

It was built in 1968, making it 57 years old in 2025. It was reconstructed in 2015.

What condition is County RD 480 over L S & I Railroad 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 November 2023.

How much traffic does County RD 480 over L S & I Railroad carry?

About 4,000 vehicles per day (2015 count).

How long is County RD 480 over L S & I Railroad?

The structure is 95 ft (29 m) long with a longest span of 93 ft (28.4 m) and a deck 47 ft wide.

Who owns County RD 480 over L S & I Railroad?

It is owned by the County Highway Agency.