US Bridges

N Twentieth ST over Kalamazoo River

Fair

Calhoun County, Michigan · 0.2 MI S of Michigan Ave · Structure no. 000000000001401

Built
1963
62 years old, rebuilt 1985
Condition
Fair
inspected November 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
335 ft
8 main spans
Daily traffic
6,500
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

N Twentieth ST over Kalamazoo River is a prestressed concrete box beam or girders - multiple carrying N Twentieth ST over Kalamazoo River in Calhoun County, Michigan. It was built in 1963 and reconstructed in 1985, so it is 62 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 6,500 vehicles a day, roughly 17% of them trucks, projected to reach 8,800 by 2042. The structure is 335 ft (102.1 m) long and 58 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesN Twentieth ST
CrossesKalamazoo River
Location0.2 MI S of Michigan Ave
RouteCity Street 2011
CountyCalhoun County
StateMichigan
Coordinates42.3348, -85.21941
Functional classUrban 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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating63.6 US tons
Inventory rating37.8 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans8
Design loadHS 20 + Mod
Structure length335 ft (102.1 m)
Longest span42 ft (12.8 m)
Deck width58 ft (17.8 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,500 (2022)
Projected traffic8,800 by 2042
Trucks17%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 N Twentieth ST over Kalamazoo River built?

It was built in 1963, making it 62 years old in 2025. It was reconstructed in 1985.

What condition is N Twentieth ST 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 November 2023.

How much traffic does N Twentieth ST over Kalamazoo River carry?

About 6,500 vehicles per day (2022 count), of which roughly 17% are trucks.

How long is N Twentieth ST over Kalamazoo River?

The structure is 335 ft (102.1 m) long with a longest span of 42 ft (12.8 m) and a deck 58 ft wide.

Who owns N Twentieth ST over Kalamazoo River?

It is owned by the City or Municipal Highway Agency.