US Bridges

M-115 over West Branch River

Poor

Osceola County, Michigan · 0.3 M NW of M-66 · Structure no. 000000000008599

Built
1937
88 years old
Condition
Poor
inspected June 2024
Type
Tee Beam
Concrete
Length
28 ft
1 main span
Daily traffic
4,184
2007 count
Owner
State
State Highway Agency

About this bridge

M-115 over West Branch River is a concrete tee beam carrying M-115 over West Branch River in Osceola County, Michigan. It was built in 1937, so it is 88 years old, older than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 4,184 vehicles a day, roughly 14% of them trucks, projected to reach 5,004 by 2018. The structure is 28 ft (8.4 m) long and 47 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesM-115
CrossesWest Branch River
Location0.3 M NW of M-66
RouteState Highway 115
CountyOsceola County
StateMichigan
Coordinates44.03505, -85.15345
Functional classRural Principal Arterial - Other

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

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.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating86.8 US tons
Inventory rating52.1 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length28 ft (8.4 m)
Longest span28 ft (8.4 m)
Deck width47 ft (14.3 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,184 (2007)
Projected traffic5,004 by 2018
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemYes

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-115 over West Branch River built?

It was built in 1937, making it 88 years old in 2025.

What condition is M-115 over West Branch River in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in June 2024.

How much traffic does M-115 over West Branch River carry?

About 4,184 vehicles per day (2007 count), of which roughly 14% are trucks.

How long is M-115 over West Branch River?

The structure is 28 ft (8.4 m) long with a longest span of 28 ft (8.4 m) and a deck 47 ft wide.

Who owns M-115 over West Branch River?

It is owned by the State Highway Agency.