US Bridges

CO RD SW 601 over Trib of Post Oak C

Fair

Johnson County, Missouri · S 35 T 46 N R 27 W · Structure no. 22542

Built
1900
125 years old, rebuilt 1987
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
85 ft
3 main spans
Daily traffic
45
2023 count
Owner
County
County Highway Agency

About this bridge

CO RD SW 601 over Trib of Post Oak C is a steel stringer/multi-beam or girder carrying CO RD SW 601 over Trib of Post Oak C in Johnson County, Missouri. It was built in 1900 and reconstructed in 1987, 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 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 45 vehicles a day, roughly 10% of them trucks, projected to reach 72 by 2043. The structure is 85 ft (25.9 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 SW 601
CrossesTrib of Post Oak C
LocationS 35 T 46 N R 27 W
RouteCounty Highway 361
CountyJohnson County
StateMissouri
Coordinates38.72804, -93.86069
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 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 alignment6: Equal to present minimum criteria
Operating rating45.6 US tons
Inventory rating28.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadOther
Structure length85 ft (25.9 m)
Longest span40 ft (12.2 m)
Deck width21 ft (6.4 m)
Roadway width20 ft (6.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic45 (2023)
Projected traffic72 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 SW 601 over Trib of Post Oak C built?

It was built in 1900, making it 125 years old in 2025. It was reconstructed in 1987.

What condition is CO RD SW 601 over Trib of Post Oak C 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 SW 601 over Trib of Post Oak C carry?

About 45 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is CO RD SW 601 over Trib of Post Oak C?

The structure is 85 ft (25.9 m) long with a longest span of 40 ft (12.2 m) and a deck 21 ft wide.

Who owns CO RD SW 601 over Trib of Post Oak C?

It is owned by the County Highway Agency.