US Bridges

M-60 over Portage River

Fair

St. Joseph County, Michigan · In Three Rivers (e Mich) · Structure no. 000000000010272

Built
1925
100 years old
Condition
Fair
inspected September 2023
Type
Arch - Deck
Concrete Continuous
Length
56 ft
2 main spans
Daily traffic
4,978
2007 count
Owner
State
State Highway Agency

About this bridge

M-60 over Portage River is a concrete continuous arch - deck carrying M-60 over Portage River in St. Joseph County, Michigan. It was built in 1925, so it is 100 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 4,978 vehicles a day, roughly 8% of them trucks, projected to reach 8,572 by 2018. The structure is 56 ft (17 m) long and 66 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesM-60
CrossesPortage River
LocationIn Three Rivers (e Mich)
RouteState Highway 60
CountySt. Joseph County
StateMichigan
Coordinates41.94442, -85.63133
Functional classUrban 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
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60.1 US tons
Inventory rating36 US tons

Structure

Structure typeArch - Deck
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadH 15
Structure length56 ft (17 m)
Longest span28 ft (8.5 m)
Deck width66 ft (20.1 m)
Roadway width46 ft (14 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,978 (2007)
Projected traffic8,572 by 2018
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 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-60 over Portage River built?

It was built in 1925, making it 100 years old in 2025.

What condition is M-60 over Portage 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 September 2023.

How much traffic does M-60 over Portage River carry?

About 4,978 vehicles per day (2007 count), of which roughly 8% are trucks.

How long is M-60 over Portage River?

The structure is 56 ft (17 m) long with a longest span of 28 ft (8.5 m) and a deck 66 ft wide.

Who owns M-60 over Portage River?

It is owned by the State Highway Agency.