US Bridges

Iris RD over Trib of Shoal CR

FairPosted for load

Newton County, Missouri · S 3 T 25 N R 31 W · Structure no. 21812

Built
1930
95 years old
Condition
Fair
inspected January 2024
Type
Slab
Concrete Continuous
Length
27 ft
2 main spans
Daily traffic
150
2024 count
Owner
County
County Highway Agency

About this bridge

Iris RD over Trib of Shoal CR is a concrete continuous slab carrying Iris RD over Trib of Shoal CR in Newton County, Missouri. It was built in 1930, so it is 95 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 5 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 150 vehicles a day, roughly 10% of them trucks, projected to reach 233 by 2044. The structure is 27 ft (8.2 m) long and 24 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesIris RD
CrossesTrib of Shoal CR
LocationS 3 T 25 N R 31 W
RouteCounty Highway 325
CountyNewton County
StateMissouri
Coordinates36.92235, -94.30925
Functional classRural 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being 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 rating18.8 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadH 10
Structure length27 ft (8.2 m)
Longest span13 ft (4 m)
Deck width24 ft (7.3 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic150 (2024)
Projected traffic233 by 2044
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 Iris RD over Trib of Shoal CR built?

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

What condition is Iris RD over Trib of Shoal CR 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 January 2024.

How much traffic does Iris RD over Trib of Shoal CR carry?

About 150 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is Iris RD over Trib of Shoal CR?

The structure is 27 ft (8.2 m) long with a longest span of 13 ft (4 m) and a deck 24 ft wide.

Who owns Iris RD over Trib of Shoal CR?

It is owned by the County Highway Agency.