US Bridges

310 ST over Lit Tarkio CR

Good

Atchison County, Missouri · S 7 T 63 N R 39 W · Structure no. 31120

Built
2004
21 years old
Condition
Good
inspected February 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
116 ft
3 main spans
Daily traffic
35
2024 count
Owner
County
County Highway Agency

About this bridge

310 ST over Lit Tarkio CR is a steel continuous stringer/multi-beam or girder carrying 310 ST over Lit Tarkio CR in Atchison 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 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 35 vehicles a day, roughly 10% of them trucks, projected to reach 40 by 2044. The structure is 116 ft (35.5 m) long and 25 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Carries310 ST
CrossesLit Tarkio CR
LocationS 7 T 63 N R 39 W
RouteCounty Highway 483
Coordinates40.2773, -95.33848
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.
Superstructure9 ExcellentNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionFebruary 2024
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 geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating29.8 US tons
Inventory rating17.9 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length116 ft (35.5 m)
Longest span64 ft (19.6 m)
Deck width25 ft (7.6 m)
Roadway width25 ft (7.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic35 (2024)
Projected traffic40 by 2044
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 310 ST over Lit Tarkio CR built?

It was built in 2004, making it 21 years old in 2025.

What condition is 310 ST over Lit 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 310 ST over Lit Tarkio CR carry?

About 35 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is 310 ST over Lit Tarkio CR?

The structure is 116 ft (35.5 m) long with a longest span of 64 ft (19.6 m) and a deck 25 ft wide.

Who owns 310 ST over Lit Tarkio CR?

It is owned by the County Highway Agency.