US Bridges

Mo 123 S over Jump-Off CR

Fair

Polk County, Missouri · S 29 T 34 N R 24 W · Structure no. 4974

Built
1926
99 years old
Condition
Fair
inspected November 2023
Type
Tee Beam
Concrete
Length
33 ft
1 main span
Daily traffic
749
2024 count
Owner
State
State Highway Agency

About this bridge

Mo 123 S over Jump-Off CR is a concrete tee beam carrying Mo 123 S over Jump-Off CR in Polk County, Missouri. It was built in 1926, so it is 99 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.

It carries about 749 vehicles a day, roughly 10% of them trucks, projected to reach 1,198 by 2044. The structure is 33 ft (10.1 m) long and 24 ft wide. If it were closed, the detour would be 21.1 mi (34 km).

Location

Open in Google Maps
CarriesMo 123 S
CrossesJump-Off CR
LocationS 29 T 34 N R 24 W
RouteState Highway 123
CountyPolk County
StateMissouri
Coordinates37.65906, -93.57592
Functional classRural Major Collector

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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length33 ft (10.1 m)
Longest span30 ft (9.1 m)
Deck width24 ft (7.2 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic749 (2024)
Projected traffic1,198 by 2044
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed21.1 mi (34 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$331,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Mo 123 S over Jump-Off CR built?

It was built in 1926, making it 99 years old in 2025.

What condition is Mo 123 S over Jump-Off 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 November 2023.

How much traffic does Mo 123 S over Jump-Off CR carry?

About 749 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is Mo 123 S over Jump-Off CR?

The structure is 33 ft (10.1 m) long with a longest span of 30 ft (9.1 m) and a deck 24 ft wide.

Who owns Mo 123 S over Jump-Off CR?

It is owned by the State Highway Agency.