US Bridges

NW 120th LN over Trib of Drywood CR

Good

Barton County, Missouri · S 12 T 33 N R 33 W · Structure no. 30801

Built
2004
21 years old
Condition
Good
inspected March 2023
Type
Slab
Concrete
Length
37 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 concrete slab carrying NW 120th LN over Trib of Drywood CR in Barton County, Missouri. It was built in 2004, so it is 21 years old, younger than the Missouri average of 45.1 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 30 vehicles a day, roughly 10% of them trucks, projected to reach 42 by 2043. The structure is 37 ft (11.3 m) long and 26 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesNW 120th LN
CrossesTrib of Drywood CR
LocationS 12 T 33 N R 33 W
RouteCounty Highway 16
Coordinates37.63633, -94.51195
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
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 evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating62.5 US tons
Inventory rating37.7 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length37 ft (11.3 m)
Longest span34 ft (10.5 m)
Deck width26 ft (7.8 m)
Roadway width25 ft (7.7 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 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 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 2004, making it 21 years old in 2025.

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

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. 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 37 ft (11.3 m) long with a longest span of 34 ft (10.5 m) and a deck 26 ft wide.

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

It is owned by the County Highway Agency.