US Bridges

CO RD NW 21 over White Oak CR

Fair

Johnson County, Missouri · S 16 T 45 N R 28 W · Structure no. 25090

Built
1988
37 years old
Condition
Fair
inspected December 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
71 ft
3 main spans
Daily traffic
110
2023 count
Owner
County
County Highway Agency

About this bridge

CO RD NW 21 over White Oak CR is a steel stringer/multi-beam or girder carrying CO RD NW 21 over White Oak CR in Johnson County, Missouri. It was built in 1988, so it is 37 years old, younger 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 110 vehicles a day, roughly 10% of them trucks, projected to reach 176 by 2043. The structure is 71 ft (21.6 m) long and 23 ft wide. If it were closed, the detour would be 2.5 mi (4 km).

Location

Open in Google Maps
CarriesCO RD NW 21
CrossesWhite Oak CR
LocationS 16 T 45 N R 28 W
RouteCounty Highway 621
CountyJohnson County
StateMissouri
Coordinates38.62371, -93.95043
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 inspectionDecember 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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating32.7 US tons
Inventory rating18.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadOther
Structure length71 ft (21.6 m)
Longest span30 ft (9.1 m)
Deck width23 ft (6.9 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic110 (2023)
Projected traffic176 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed2.5 mi (4 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 21 over White Oak CR built?

It was built in 1988, making it 37 years old in 2025.

What condition is CO RD NW 21 over White Oak 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 December 2024.

How much traffic does CO RD NW 21 over White Oak CR carry?

About 110 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is CO RD NW 21 over White Oak CR?

The structure is 71 ft (21.6 m) long with a longest span of 30 ft (9.1 m) and a deck 23 ft wide.

Who owns CO RD NW 21 over White Oak CR?

It is owned by the County Highway Agency.