US Bridges

120 ST over W Tarkio CR

Good

Atchison County, Missouri · S 1 T 66 N R 40 W · Structure no. 15967

Built
2000
25 years old
Condition
Good
inspected February 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
158 ft
3 main spans
Daily traffic
50
2024 count
Owner
County
County Highway Agency

About this bridge

120 ST over W Tarkio CR is a prestressed concrete continuous stringer/multi-beam or girder carrying 120 ST over W Tarkio CR in Atchison County, Missouri. It was built in 2000, so it is 25 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 50 vehicles a day, roughly 10% of them trucks, projected to reach 58 by 2044. The structure is 158 ft (48.2 m) long and 25 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Carries120 ST
CrossesW Tarkio CR
LocationS 1 T 66 N R 40 W
RouteCounty Highway 105
Coordinates40.55357, -95.38138
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61.5 US tons
Inventory rating36.7 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length158 ft (48.2 m)
Longest span60 ft (18.3 m)
Deck width25 ft (7.5 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2024)
Projected traffic58 by 2044
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 120 ST over W Tarkio CR built?

It was built in 2000, making it 25 years old in 2025.

What condition is 120 ST over W Tarkio 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 February 2024.

How much traffic does 120 ST over W Tarkio CR carry?

About 50 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is 120 ST over W Tarkio CR?

The structure is 158 ft (48.2 m) long with a longest span of 60 ft (18.3 m) and a deck 25 ft wide.

Who owns 120 ST over W Tarkio CR?

It is owned by the County Highway Agency.