US Bridges

Bristol RD(OLDM121 over I-475

Fair

Genesee County, Michigan · 0.5 MI S of Flint · Structure no. 000000000002651

Built
1971
54 years old, rebuilt 2009
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
140 ft
2 main spans
Daily traffic
17,300
1982 count
Owner
State
State Highway Agency

About this bridge

Bristol RD(OLDM121 over I-475 is a steel continuous stringer/multi-beam or girder carrying Bristol RD(OLDM121 over I-475 in Genesee County, Michigan. It was built in 1971 and reconstructed in 2009, so it is 54 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 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 17,300 vehicles a day, roughly 5% of them trucks, projected to reach 19,895 by 2002. The structure is 140 ft (42.7 m) long and 77 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesBristol RD(OLDM121
CrossesI-475
Location0.5 MI S of Flint
RouteCounty Highway 90300
CountyGenesee County
StateMichigan
Coordinates42.97426, -83.68179
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66.5 US tons
Inventory rating39.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length140 ft (42.7 m)
Longest span69 ft (21 m)
Deck width77 ft (23.4 m)
Roadway width64 ft (19.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic17,300 (1982)
Projected traffic19,895 by 2002
Trucks5%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed3.1 mi (5 km)
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 Bristol RD(OLDM121 over I-475 built?

It was built in 1971, making it 54 years old in 2025. It was reconstructed in 2009.

What condition is Bristol RD(OLDM121 over I-475 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 Bristol RD(OLDM121 over I-475 carry?

About 17,300 vehicles per day (1982 count), of which roughly 5% are trucks.

How long is Bristol RD(OLDM121 over I-475?

The structure is 140 ft (42.7 m) long with a longest span of 69 ft (21 m) and a deck 77 ft wide.

Who owns Bristol RD(OLDM121 over I-475?

It is owned by the State Highway Agency.