US Bridges

County Road 550 over Dead River

Fair

Marquette County, Michigan · In Marquette · Structure no. 000000000006557

Built
1995
30 years old
Condition
Fair
inspected July 2023
Type
Box Beam or Girders - Multiple
Concrete
Length
194 ft
3 main spans
Daily traffic
2,812
1994 count
Owner
City
City or Municipal Highway Agency

About this bridge

County Road 550 over Dead River is a concrete box beam or girders - multiple carrying County Road 550 over Dead River in Marquette County, Michigan. It was built in 1995, so it is 30 years old, younger 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 2,812 vehicles a day, roughly 4% of them trucks, projected to reach 3,450 by 2014. The structure is 194 ft (59.1 m) long and 40 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesCounty Road 550
CrossesDead River
LocationIn Marquette
RouteCity Street 2018
CountyMarquette County
StateMichigan
Coordinates46.572, -87.40987
Functional classUrban 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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment9: Superior to present desirable criteria
Operating rating77.2 US tons
Inventory rating38.6 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete
DeckConcrete, precast panels
Main spans3
Design loadHS 20
Structure length194 ft (59.1 m)
Longest span100 ft (30.4 m)
Deck width40 ft (12.3 m)
Roadway width40 ft (12.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,812 (1994)
Projected traffic3,450 by 2014
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was County Road 550 over Dead River built?

It was built in 1995, making it 30 years old in 2025.

What condition is County Road 550 over Dead 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 July 2023.

How much traffic does County Road 550 over Dead River carry?

About 2,812 vehicles per day (1994 count), of which roughly 4% are trucks.

How long is County Road 550 over Dead River?

The structure is 194 ft (59.1 m) long with a longest span of 100 ft (30.4 m) and a deck 40 ft wide.

Who owns County Road 550 over Dead River?

It is owned by the City or Municipal Highway Agency.