US Bridges

M-25 over Cm RR

Fair

Bay County, Michigan · In Bay City · Structure no. 000000000000649

Built
1957
68 years old, rebuilt 1993
Condition
Fair
inspected August 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
246 ft
5 main spans
Daily traffic
30,724
2018 count
Owner
State
State Highway Agency

About this bridge

M-25 over Cm RR is a prestressed concrete box beam or girders - multiple carrying M-25 over Cm RR in Bay County, Michigan. It was built in 1957 and reconstructed in 1993, so it is 68 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 6 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 30,724 vehicles a day, roughly 3% of them trucks, projected to reach 35,333 by 2038. The structure is 246 ft (75.1 m) long and 68 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesM-25
CrossesCm RR
LocationIn Bay City
RouteState Highway 25
CountyBay County
StateMichigan
Coordinates43.59725, -83.89805
Functional classUrban Other Principal 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
Deck8 Very GoodNo problems noted.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating72.1 US tons
Inventory rating43.2 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans5
Design loadHS 25 or greater
Structure length246 ft (75.1 m)
Longest span53 ft (16.3 m)
Deck width68 ft (20.8 m)
Roadway width52 ft (15.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30,724 (2018)
Projected traffic35,333 by 2038
Trucks3%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesRailroad
Detour if closed1.2 mi (2 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 proposedDeck replacement with only incidental widening
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was M-25 over Cm RR built?

It was built in 1957, making it 68 years old in 2025. It was reconstructed in 1993.

What condition is M-25 over Cm RR 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 August 2023.

How much traffic does M-25 over Cm RR carry?

About 30,724 vehicles per day (2018 count), of which roughly 3% are trucks.

How long is M-25 over Cm RR?

The structure is 246 ft (75.1 m) long with a longest span of 53 ft (16.3 m) and a deck 68 ft wide.

Who owns M-25 over Cm RR?

It is owned by the State Highway Agency.