US Bridges

Ninth ST over Iowa Br

PoorPosted for load

Jasper County, Missouri · S 11 T 27 N R 33 W · Structure no. 19431

Built
1960
65 years old
Condition
Poor
inspected February 2025
Type
Slab
Concrete Continuous
Length
25 ft
2 main spans
Daily traffic
1,850
2025 count
Owner
City
City or Municipal Highway Agency

About this bridge

Ninth ST over Iowa Br is a concrete continuous slab carrying Ninth 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 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. Its operating status is: posted for load restriction.

It carries about 1,850 vehicles a day, roughly 10% of them trucks, projected to reach 2,775 by 2045. The structure is 25 ft (7.6 m) long and 36 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

CarriesNinth ST
CrossesIowa Br
LocationS 11 T 27 N R 33 W
RouteCity Street 0
Coordinates37.08136, -94.50666
Functional classUrban 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
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2025
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating34.7 US tons
Inventory rating20.8 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadH 10
Structure length25 ft (7.6 m)
Longest span12 ft (3.7 m)
Deck width36 ft (11.1 m)
Roadway width30 ft (9.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,850 (2025)
Projected traffic2,775 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$379,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Ninth ST over Iowa Br built?

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

What condition is Ninth ST over Iowa Br 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 February 2025.

How much traffic does Ninth ST over Iowa Br carry?

About 1,850 vehicles per day (2025 count), of which roughly 10% are trucks.

How long is Ninth ST over Iowa Br?

The structure is 25 ft (7.6 m) long with a longest span of 12 ft (3.7 m) and a deck 36 ft wide.

Who owns Ninth ST over Iowa Br?

It is owned by the City or Municipal Highway Agency.