US Bridges

M-6 Ramp M over US-131SB C-D & Ramp C

Fair

Kent County, Michigan · Byron Twp Sec 1&2 · Structure no. 000000000012919

Built
2000
25 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
188 ft
1 main span
Daily traffic
9,250
2000 count
Owner
State
State Highway Agency

About this bridge

M-6 Ramp M over US-131SB C-D & Ramp C is a steel stringer/multi-beam or girder carrying M-6 Ramp M over US-131SB C-D & Ramp C in Kent County, Michigan. It was built in 2000, so it is 25 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 9,250 vehicles a day, roughly 8% of them trucks, projected to reach 9,250 by 2015. The structure is 188 ft (57.3 m) long and 34 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesM-6 Ramp M
CrossesUS-131SB C-D & Ramp C
LocationByron Twp Sec 1&2
RouteState Highway 6
CountyKent County
StateMichigan
Coordinates42.84394, -85.67923
Functional classUrban Principal Arterial - Other Freeway or Expressway

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating76.4 US tons
Inventory rating55.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length188 ft (57.3 m)
Longest span188 ft (57.3 m)
Deck width34 ft (10.3 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,250 (2000)
Projected traffic9,250 by 2015
Trucks8%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 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 M-6 Ramp M over US-131SB C-D & Ramp C built?

It was built in 2000, making it 25 years old in 2025.

What condition is M-6 Ramp M over US-131SB C-D & Ramp C 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 September 2023.

How much traffic does M-6 Ramp M over US-131SB C-D & Ramp C carry?

About 9,250 vehicles per day (2000 count), of which roughly 8% are trucks.

How long is M-6 Ramp M over US-131SB C-D & Ramp C?

The structure is 188 ft (57.3 m) long with a longest span of 188 ft (57.3 m) and a deck 34 ft wide.

Who owns M-6 Ramp M over US-131SB C-D & Ramp C?

It is owned by the State Highway Agency.