US Bridges

M-21 over Mistequay Creek

Good

Genesee County, Michigan · 2.1 MI E of Shiawassee CO · Structure no. 000000000002572

Built
2010
15 years old
Condition
Good
inspected March 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
44 ft
1 main span
Daily traffic
6,400
2008 count
Owner
State
State Highway Agency

About this bridge

M-21 over Mistequay Creek is a prestressed concrete stringer/multi-beam or girder carrying M-21 over Mistequay Creek in Genesee County, Michigan. It was built in 2010, so it is 15 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 6,400 vehicles a day, roughly 4% of them trucks, projected to reach 7,900 by 2031. The structure is 44 ft (13.4 m) long and 89 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesM-21
CrossesMistequay Creek
Location2.1 MI E of Shiawassee CO
RouteState Highway 56
CountyGenesee County
StateMichigan
Coordinates43.00076, -83.88799
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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating70.3 US tons
Inventory rating44.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadGreater than HL 93
Structure length44 ft (13.4 m)
Longest span42 ft (12.7 m)
Deck width89 ft (27.1 m)
Roadway width86 ft (26.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,400 (2008)
Projected traffic7,900 by 2031
Trucks4%
Lanes on structure4
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-21 over Mistequay Creek built?

It was built in 2010, making it 15 years old in 2025.

What condition is M-21 over Mistequay Creek 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 March 2024.

How much traffic does M-21 over Mistequay Creek carry?

About 6,400 vehicles per day (2008 count), of which roughly 4% are trucks.

How long is M-21 over Mistequay Creek?

The structure is 44 ft (13.4 m) long with a longest span of 42 ft (12.7 m) and a deck 89 ft wide.

Who owns M-21 over Mistequay Creek?

It is owned by the State Highway Agency.