US Bridges

NW300 over White Oak CR

Fair

Henry County, Missouri · S 21 T 42 N R 28 W · Structure no. 20540

Built
1920
105 years old, rebuilt 1986
Condition
Fair
inspected March 2023
Type
Girder and Floorbeam System
Steel
Length
63 ft
1 main span
Daily traffic
115
2023 count
Owner
County
County Highway Agency

About this bridge

NW300 over White Oak CR is a steel girder and floorbeam system carrying NW300 over White Oak CR in Henry County, Missouri. It was built in 1920 and reconstructed in 1986, so it is 105 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 115 vehicles a day, roughly 10% of them trucks, projected to reach 161 by 2043. The structure is 63 ft (19.2 m) long and 18 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesNW300
CrossesWhite Oak CR
LocationS 21 T 42 N R 28 W
RouteCounty Highway 264
CountyHenry County
StateMissouri
Coordinates38.41614, -94.01346
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 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 geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating31.7 US tons
Inventory rating20.8 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadOther
Structure length63 ft (19.2 m)
Longest span60 ft (18.3 m)
Deck width18 ft (5.6 m)
Roadway width18 ft (5.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic115 (2023)
Projected traffic161 by 2043
Trucks10%
Lanes on structure1
Traffic directionOne-lane bridge for two-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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$336,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was NW300 over White Oak CR built?

It was built in 1920, making it 105 years old in 2025. It was reconstructed in 1986.

What condition is NW300 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 March 2023.

How much traffic does NW300 over White Oak CR carry?

About 115 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is NW300 over White Oak CR?

The structure is 63 ft (19.2 m) long with a longest span of 60 ft (18.3 m) and a deck 18 ft wide.

Who owns NW300 over White Oak CR?

It is owned by the County Highway Agency.