US Bridges

CO RD NW 121 over Devils Br Post Oa

Fair

Johnson County, Missouri · S 15 T 46 N R 26 W · Structure no. 19933

Built
1900
125 years old, rebuilt 1986
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
47 ft
1 main span
Daily traffic
65
2023 count
Owner
County
County Highway Agency

About this bridge

CO RD NW 121 over Devils Br Post Oa is a steel stringer/multi-beam or girder carrying CO RD NW 121 over Devils Br Post Oa in Johnson County, Missouri. It was built in 1900 and reconstructed in 1986, so it is 125 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 65 vehicles a day, roughly 10% of them trucks, projected to reach 104 by 2043. The structure is 47 ft (14.3 m) long and 21 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesCO RD NW 121
CrossesDevils Br Post Oa
LocationS 15 T 46 N R 26 W
RouteCounty Highway 240
CountyJohnson County
StateMissouri
Coordinates38.7863, -93.76738
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
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 inspectionNovember 2024
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 adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating47.6 US tons
Inventory rating28.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadOther
Structure length47 ft (14.3 m)
Longest span44 ft (13.4 m)
Deck width21 ft (6.4 m)
Roadway width20 ft (6.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic65 (2023)
Projected traffic104 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 CO RD NW 121 over Devils Br Post Oa built?

It was built in 1900, making it 125 years old in 2025. It was reconstructed in 1986.

What condition is CO RD NW 121 over Devils Br Post Oa 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 2024.

How much traffic does CO RD NW 121 over Devils Br Post Oa carry?

About 65 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is CO RD NW 121 over Devils Br Post Oa?

The structure is 47 ft (14.3 m) long with a longest span of 44 ft (13.4 m) and a deck 21 ft wide.

Who owns CO RD NW 121 over Devils Br Post Oa?

It is owned by the County Highway Agency.