US Bridges

M-13 over Ryan Drain

Fair

Bay County, Michigan · 6.4 MI S of Pinconning · Structure no. 000000000000589

Built
1937
88 years old, rebuilt 1951
Condition
Fair
inspected January 2025
Type
Culvert
Concrete Continuous
Length
36 ft
2 main spans
Daily traffic
10,813
2007 count
Owner
State
State Highway Agency

About this bridge

M-13 over Ryan Drain is a concrete continuous culvert carrying M-13 over Ryan Drain in Bay County, Michigan. It was built in 1937 and reconstructed in 1951, 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 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 10,813 vehicles a day, roughly 5% of them trucks, projected to reach 11,064 by 2018. The structure is 36 ft (10.9 m) long. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesM-13
CrossesRyan Drain
Location6.4 MI S of Pinconning
RouteState Highway 13
CountyBay County
StateMichigan
Coordinates43.76479, -83.97685
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
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating107.1 US tons
Inventory rating89 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadH 15
Structure length36 ft (10.9 m)
Longest span17 ft (5.1 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,813 (2007)
Projected traffic11,064 by 2018
Trucks5%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
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-13 over Ryan Drain built?

It was built in 1937, making it 88 years old in 2025. It was reconstructed in 1951.

What condition is M-13 over Ryan Drain 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 January 2025.

How much traffic does M-13 over Ryan Drain carry?

About 10,813 vehicles per day (2007 count), of which roughly 5% are trucks.

How long is M-13 over Ryan Drain?

The structure is 36 ft (10.9 m) long with a longest span of 17 ft (5.1 m).

Who owns M-13 over Ryan Drain?

It is owned by the State Highway Agency.