US Bridges

Fifth ST M-21 over I-475 & Ramps C&d

Fair

Genesee County, Michigan · In Flint · Structure no. 000000000002665

Built
1970
55 years old, rebuilt 2004
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
223 ft
2 main spans
Daily traffic
19,000
2007 count
Owner
State
State Highway Agency

About this bridge

Fifth ST M-21 over I-475 & Ramps C&d is a steel stringer/multi-beam or girder carrying Fifth ST M-21 over I-475 & Ramps C&d in Genesee County, Michigan. It was built in 1970 and reconstructed in 2004, so it is 55 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 19,000 vehicles a day, roughly 2% of them trucks, projected to reach 15,277 by 2018. The structure is 223 ft (67.9 m) long and 66 ft wide.

Location

Open in Google Maps
CarriesFifth ST M-21
CrossesI-475 & Ramps C&d
LocationIn Flint
RouteState Highway 21
CountyGenesee County
StateMichigan
Coordinates43.01414, -83.68159
Functional classUrban Other Principal 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating70.3 US tons
Inventory rating42.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length223 ft (67.9 m)
Longest span122 ft (37.2 m)
Deck width66 ft (20.2 m)
Roadway width48 ft (14.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic19,000 (2007)
Projected traffic15,277 by 2018
Trucks2%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 Fifth ST M-21 over I-475 & Ramps C&d built?

It was built in 1970, making it 55 years old in 2025. It was reconstructed in 2004.

What condition is Fifth ST M-21 over I-475 & Ramps C&d 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 2024.

How much traffic does Fifth ST M-21 over I-475 & Ramps C&d carry?

About 19,000 vehicles per day (2007 count), of which roughly 2% are trucks.

How long is Fifth ST M-21 over I-475 & Ramps C&d?

The structure is 223 ft (67.9 m) long with a longest span of 122 ft (37.2 m) and a deck 66 ft wide.

Who owns Fifth ST M-21 over I-475 & Ramps C&d?

It is owned by the State Highway Agency.