US Bridges

M-100 over Sharp Drain

Good

Eaton County, Michigan · 3.6 MI N of Potterville · Structure no. 000000000013823

Built
2016
9 years old
Condition
Good
inspected July 2023
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete
Length
34 ft
1 main span
Daily traffic
5,425
2015 count
Owner
State
State Highway Agency

About this bridge

M-100 over Sharp Drain is a prestressed concrete box beam or girders - single or spread carrying M-100 over Sharp Drain in Eaton County, Michigan. It was built in 2016, so it is 9 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 34 ft (10.3 m) long and 46 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesM-100
CrossesSharp Drain
Location3.6 MI N of Potterville
RouteState Highway 100
Coordinates42.6742, -84.73943
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.
Superstructure9 ExcellentNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating88.6 US tons
Inventory rating68.6 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadGreater than HL 93
Structure length34 ft (10.3 m)
Longest span32 ft (9.8 m)
Deck width46 ft (14.1 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
CrossesWaterway
Detour if closed1.2 mi (2 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was M-100 over Sharp Drain built?

It was built in 2016, making it 9 years old in 2025.

What condition is M-100 over Sharp Drain 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 Sharp Drain carry?

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

How long is M-100 over Sharp Drain?

The structure is 34 ft (10.3 m) long with a longest span of 32 ft (9.8 m) and a deck 46 ft wide.

Who owns M-100 over Sharp Drain?

It is owned by the State Highway Agency.