US Bridges

M-30 over Tobacco River

Good

Gladwin County, Michigan · 0.3 MI N of Midland Col · Structure no. 000000000002887

Built
2021
4 years old, rebuilt 2024
Condition
Good
inspected November 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
233 ft
3 main spans
Daily traffic
4,100
2022 count
Owner
State
State Highway Agency

About this bridge

M-30 over Tobacco River is a prestressed concrete stringer/multi-beam or girder carrying M-30 over Tobacco River in Gladwin County, Michigan. It was built in 2021 and reconstructed in 2024, so it is 4 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 4,100 vehicles a day, roughly 3% of them trucks, projected to reach 4,825 by 2042. The structure is 233 ft (70.9 m) long and 59 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesM-30
CrossesTobacco River
Location0.3 MI N of Midland Col
RouteState Highway 30
CountyGladwin County
StateMichigan
Coordinates43.81699, -84.38625
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
Deck8 Very GoodNo problems noted.
Superstructure9 ExcellentNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating74.3 US tons
Inventory rating49.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadGreater than HL 93
Structure length233 ft (70.9 m)
Longest span102 ft (31.1 m)
Deck width59 ft (18.1 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,100 (2022)
Projected traffic4,825 by 2042
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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-30 over Tobacco River built?

It was built in 2021, making it 4 years old in 2025. It was reconstructed in 2024.

What condition is M-30 over Tobacco River 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 November 2024.

How much traffic does M-30 over Tobacco River carry?

About 4,100 vehicles per day (2022 count), of which roughly 3% are trucks.

How long is M-30 over Tobacco River?

The structure is 233 ft (70.9 m) long with a longest span of 102 ft (31.1 m) and a deck 59 ft wide.

Who owns M-30 over Tobacco River?

It is owned by the State Highway Agency.