US Bridges

NW 120th LN over Trib of Drywood CR

Fair

Barton County, Missouri · S 1 T 33 N R 33 W · Structure no. 12638

Built
1970
55 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
44 ft
1 main span
Daily traffic
30
2023 count
Owner
County
County Highway Agency

About this bridge

NW 120th LN over Trib of Drywood CR is a steel stringer/multi-beam or girder carrying NW 120th LN over Trib of Drywood CR in Barton County, Missouri. It was built in 1970, so it is 55 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 30 vehicles a day, roughly 10% of them trucks, projected to reach 42 by 2043. The structure is 44 ft (13.4 m) long and 22 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesNW 120th LN
CrossesTrib of Drywood CR
LocationS 1 T 33 N R 33 W
RouteCounty Highway 16
CountyBarton County
StateMissouri
Coordinates37.64369, -94.51171
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36.7 US tons
Inventory rating20.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadOther
Structure length44 ft (13.4 m)
Longest span41 ft (12.5 m)
Deck width22 ft (6.6 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30 (2023)
Projected traffic42 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 NW 120th LN over Trib of Drywood CR built?

It was built in 1970, making it 55 years old in 2025.

What condition is NW 120th LN over Trib of Drywood 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 NW 120th LN over Trib of Drywood CR carry?

About 30 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is NW 120th LN over Trib of Drywood CR?

The structure is 44 ft (13.4 m) long with a longest span of 41 ft (12.5 m) and a deck 22 ft wide.

Who owns NW 120th LN over Trib of Drywood CR?

It is owned by the County Highway Agency.