US Bridges

M-18 over S Br Little Sugar River

Good

Gladwin County, Michigan · 2.2 MI SE of Oberlin · Structure no. 000000000002877

Built
1923
102 years old
Condition
Good
inspected June 2024
Type
Tee Beam
Concrete
Length
27 ft
1 main span
Daily traffic
5,963
2007 count
Owner
State
State Highway Agency

About this bridge

M-18 over S Br Little Sugar River is a concrete tee beam carrying M-18 over S Br Little Sugar River in Gladwin County, Michigan. It was built in 1923, so it is 102 years old, older 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 5,963 vehicles a day, roughly 3% of them trucks, projected to reach 10,919 by 2018. The structure is 27 ft (8.2 m) long and 34 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesM-18
CrossesS Br Little Sugar River
Location2.2 MI SE of Oberlin
RouteState Highway 18
Coordinates44.05526, -84.48669
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.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation7: Better than present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating64.3 US tons
Inventory rating38.6 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length27 ft (8.2 m)
Longest span27 ft (8.2 m)
Deck width34 ft (10.4 m)
Roadway width32 ft (9.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,963 (2007)
Projected traffic10,919 by 2018
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was M-18 over S Br Little Sugar River built?

It was built in 1923, making it 102 years old in 2025.

What condition is M-18 over S Br Little Sugar 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 June 2024.

How much traffic does M-18 over S Br Little Sugar River carry?

About 5,963 vehicles per day (2007 count), of which roughly 3% are trucks.

How long is M-18 over S Br Little Sugar River?

The structure is 27 ft (8.2 m) long with a longest span of 27 ft (8.2 m) and a deck 34 ft wide.

Who owns M-18 over S Br Little Sugar River?

It is owned by the State Highway Agency.