US Bridges

M-30 over Little Tobacco River

Fair

Gladwin County, Michigan · 1.0 MI N of M-61 · Structure no. 000000000002889

Built
1958
67 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
180 ft
3 main spans
Daily traffic
2,536
2007 count
Owner
State
State Highway Agency

About this bridge

M-30 over Little Tobacco River is a steel stringer/multi-beam or girder carrying M-30 over Little Tobacco River in Gladwin County, Michigan. It was built in 1958, so it is 67 years old, older 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 5 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 2,536 vehicles a day, roughly 7% of them trucks, projected to reach 3,043 by 2018. The structure is 180 ft (54.8 m) long and 33 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesM-30
CrossesLittle Tobacco River
Location1.0 MI N of M-61
RouteState Highway 30
CountyGladwin County
StateMichigan
Coordinates43.99089, -84.3706
Functional classRural Minor Arterial

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating77.2 US tons
Inventory rating46.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length180 ft (54.8 m)
Longest span60 ft (18.2 m)
Deck width33 ft (10.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,536 (2007)
Projected traffic3,043 by 2018
Trucks7%
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 proposedDeck replacement with only incidental widening
Estimated improvement cost$134,000
NavigationNo navigation control on waterway

Frequently asked questions

When was M-30 over Little Tobacco River built?

It was built in 1958, making it 67 years old in 2025.

What condition is M-30 over Little Tobacco River 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 June 2024.

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

About 2,536 vehicles per day (2007 count), of which roughly 7% are trucks.

How long is M-30 over Little Tobacco River?

The structure is 180 ft (54.8 m) long with a longest span of 60 ft (18.2 m) and a deck 33 ft wide.

Who owns M-30 over Little Tobacco River?

It is owned by the State Highway Agency.