US Bridges

Twelfth ST over Iowa Br

Fair

Jasper County, Missouri · S 11 T 27 N R 33 W · Structure no. 19422

Built
1960
65 years old
Condition
Fair
inspected February 2025
Type
Slab
Concrete Continuous
Length
28 ft
3 main spans
Daily traffic
1,000
2025 count
Owner
City
City or Municipal Highway Agency

About this bridge

Twelfth ST over Iowa Br is a concrete continuous slab carrying Twelfth ST over Iowa Br in Jasper County, Missouri. It was built in 1960, so it is 65 years old, older than the Missouri average of 45.1 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 1,000 vehicles a day, roughly 10% of them trucks, projected to reach 1,500 by 2045. The structure is 28 ft (8.5 m) long and 36 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesTwelfth ST
CrossesIowa Br
LocationS 11 T 27 N R 33 W
RouteCity Street 0
CountyJasper County
StateMissouri
Coordinates37.07809, -94.50578
Functional classUrban Local

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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2025
Inspection intervalevery 24 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
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating54.6 US tons
Inventory rating17.9 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 10
Structure length28 ft (8.5 m)
Longest span9 ft (2.7 m)
Deck width36 ft (11 m)
Roadway width30 ft (9.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,000 (2025)
Projected traffic1,500 by 2045
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed0.6 mi (1 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 Twelfth ST over Iowa Br built?

It was built in 1960, making it 65 years old in 2025.

What condition is Twelfth ST over Iowa Br 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 February 2025.

How much traffic does Twelfth ST over Iowa Br carry?

About 1,000 vehicles per day (2025 count), of which roughly 10% are trucks.

How long is Twelfth ST over Iowa Br?

The structure is 28 ft (8.5 m) long with a longest span of 9 ft (2.7 m) and a deck 36 ft wide.

Who owns Twelfth ST over Iowa Br?

It is owned by the City or Municipal Highway Agency.