US Bridges

21st Street over Little Rabbit River

PoorPosted for load

Allegan County, Michigan · Approx 1/8MI N of 144th a · Structure no. 000000000000238

Built
1973
52 years old
Condition
Poor
inspected April 2024
Type
Culvert
Steel
Length
31 ft
2 main spans
Daily traffic
168
2002 count
Owner
County
County Highway Agency

About this bridge

21st Street over Little Rabbit River is a steel culvert carrying 21st Street over Little Rabbit River in Allegan County, Michigan. It was built in 1973, so it is 52 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 3 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. Its operating status is: posted for load restriction.

It carries about 168 vehicles a day, roughly 7% of them trucks, projected to reach 336 by 2022. The structure is 31 ft (9.3 m) long. If it were closed, the detour would be 3.1 mi (5 km).

Carries21st Street
CrossesLittle Rabbit River
LocationApprox 1/8MI N of 144th a
RouteCounty Highway 0
Coordinates42.74083, -85.75181
Functional classRural Local

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 protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Last inspectionApril 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating30.3 US tons
Inventory rating18.2 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans2
Design loadH 20
Structure length31 ft (9.3 m)
Longest span13 ft (4 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic168 (2002)
Projected traffic336 by 2022
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 21st Street over Little Rabbit River built?

It was built in 1973, making it 52 years old in 2025.

What condition is 21st Street over Little Rabbit 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 April 2024.

How much traffic does 21st Street over Little Rabbit River carry?

About 168 vehicles per day (2002 count), of which roughly 7% are trucks.

How long is 21st Street over Little Rabbit River?

The structure is 31 ft (9.3 m) long with a longest span of 13 ft (4 m).

Who owns 21st Street over Little Rabbit River?

It is owned by the County Highway Agency.