US Bridges

29 1/2 Mile Road over Kalamazoo River

Poor

Calhoun County, Michigan · Albion Twp Sec 1 · Structure no. 000000000001337

Built
1940
85 years old
Condition
Poor
inspected September 2024
Type
Culvert
Steel
Length
51 ft
6 main spans
Daily traffic
648
1995 count
Owner
County
County Highway Agency

About this bridge

29 1/2 Mile Road over Kalamazoo River is a steel culvert carrying 29 1/2 Mile Road over Kalamazoo River in Calhoun County, Michigan. It was built in 1940, so it is 85 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 648 vehicles a day, roughly 9% of them trucks, projected to reach 1,160 by 2023. The structure is 51 ft (15.5 m) long. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
Carries29 1/2 Mile Road
CrossesKalamazoo River
LocationAlbion Twp Sec 1
RouteCounty Highway 0
CountyCalhoun County
StateMichigan
Coordinates42.24585, -84.72673
Functional classUrban Minor Arterial

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
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Culvert4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionSeptember 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating107.1 US tons
Inventory rating69.3 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans6
Design loadHS 20
Structure length51 ft (15.5 m)
Longest span6 ft (1.8 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic648 (1995)
Projected traffic1,160 by 2023
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 29 1/2 Mile Road over Kalamazoo River built?

It was built in 1940, making it 85 years old in 2025.

What condition is 29 1/2 Mile Road over Kalamazoo 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 September 2024.

How much traffic does 29 1/2 Mile Road over Kalamazoo River carry?

About 648 vehicles per day (1995 count), of which roughly 9% are trucks.

How long is 29 1/2 Mile Road over Kalamazoo River?

The structure is 51 ft (15.5 m) long with a longest span of 6 ft (1.8 m).

Who owns 29 1/2 Mile Road over Kalamazoo River?

It is owned by the County Highway Agency.