US Bridges

M-100 over Gtw RR

Good

Eaton County, Michigan · N Lts of Potterville · Structure no. 000000000002285

Built
2015
10 years old
Condition
Good
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
108 ft
1 main span
Daily traffic
5,425
2015 count
Owner
State
State Highway Agency

About this bridge

M-100 over Gtw RR is a steel stringer/multi-beam or girder carrying M-100 over Gtw RR in Eaton County, Michigan. It was built in 2015, so it is 10 years old, younger than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 5,425 vehicles a day, roughly 4% of them trucks, projected to reach 6,300 by 2035. The structure is 108 ft (32.8 m) long and 57 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesM-100
CrossesGtw RR
LocationN Lts of Potterville
RouteState Highway 100
Coordinates42.63253, -84.73902
Functional classRural Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating58.5 US tons
Inventory rating45 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadGreater than HL 93
Structure length108 ft (32.8 m)
Longest span101 ft (30.7 m)
Deck width57 ft (17.5 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,425 (2015)
Projected traffic6,300 by 2035
Trucks4%
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

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-100 over Gtw RR built?

It was built in 2015, making it 10 years old in 2025.

What condition is M-100 over Gtw RR in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in July 2023.

How much traffic does M-100 over Gtw RR carry?

About 5,425 vehicles per day (2015 count), of which roughly 4% are trucks.

How long is M-100 over Gtw RR?

The structure is 108 ft (32.8 m) long with a longest span of 101 ft (30.7 m) and a deck 57 ft wide.

Who owns M-100 over Gtw RR?

It is owned by the State Highway Agency.