US Bridges

Allegan Dam RD over Kalamazoo River

FairPosted for load

Allegan County, Michigan · 0.35 MI W of 41st ST · Structure no. 000000000014569

Built
1930
95 years old
Condition
Fair
inspected August 2024
Type
Girder and Floorbeam System
Steel
Length
225 ft
5 main spans
Daily traffic
50
2022 count
Owner
Private
Private (other than railroad)

About this bridge

Allegan Dam RD over Kalamazoo River is a steel girder and floorbeam system carrying Allegan Dam RD over Kalamazoo River in Allegan County, Michigan. It was built in 1930, so it is 95 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. Its operating status is: posted for load restriction.

It carries about 50 vehicles a day, roughly 1% of them trucks, projected to reach 100 by 2042. The structure is 225 ft (68.6 m) long and 19 ft wide.

Location

Open in Google Maps
CarriesAllegan Dam RD
CrossesKalamazoo River
Location0.35 MI W of 41st ST
RouteCounty Highway 0
CountyAllegan County
StateMichigan
Coordinates42.5638, -85.9537
Functional classRural Minor Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating28.2 US tons
Inventory rating16.8 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel
DeckConcrete, cast-in-place
Main spans5
Design loadUnknown
Structure length225 ft (68.6 m)
Longest span52 ft (15.7 m)
Deck width19 ft (5.9 m)
Roadway width18 ft (5.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2022)
Projected traffic100 by 2042
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerPrivate (other than railroad)
Maintained byPrivate (other than railroad)
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 Allegan Dam RD over Kalamazoo River built?

It was built in 1930, making it 95 years old in 2025.

What condition is Allegan Dam RD over Kalamazoo 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 August 2024.

How much traffic does Allegan Dam RD over Kalamazoo River carry?

About 50 vehicles per day (2022 count), of which roughly 1% are trucks.

How long is Allegan Dam RD over Kalamazoo River?

The structure is 225 ft (68.6 m) long with a longest span of 52 ft (15.7 m) and a deck 19 ft wide.

Who owns Allegan Dam RD over Kalamazoo River?

It is owned by the Private (other than railroad).