US Bridges

250 ST over Tarkio Rvr

PoorPosted for load

Atchison County, Missouri · S 9 T 64 N R 40 W · Structure no. 23183

Built
1975
50 years old
Condition
Poor
inspected February 2024
Type
Truss - Thru
Steel
Length
172 ft
1 main span
Daily traffic
10
2024 count
Owner
County
County Highway Agency

About this bridge

250 ST over Tarkio Rvr is a steel truss - thru carrying 250 ST over Tarkio Rvr in Atchison County, Missouri. It was built in 1975, so it is 50 years old, older than the Missouri average of 45.1 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 10 vehicles a day, roughly 10% of them trucks, projected to reach 12 by 2044. The structure is 172 ft (52.4 m) long and 22 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
Carries250 ST
CrossesTarkio Rvr
LocationS 9 T 64 N R 40 W
RouteCounty Highway 394
CountyAtchison County
StateMissouri
Coordinates40.36516, -95.40973
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating54.6 US tons
Inventory rating17.9 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+2 approach)
Design loadOther
Structure length172 ft (52.4 m)
Longest span100 ft (30.5 m)
Deck width22 ft (6.8 m)
Roadway width21 ft (6.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10 (2024)
Projected traffic12 by 2044
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.1 million (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 250 ST over Tarkio Rvr built?

It was built in 1975, making it 50 years old in 2025.

What condition is 250 ST over Tarkio Rvr in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in February 2024.

How much traffic does 250 ST over Tarkio Rvr carry?

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

How long is 250 ST over Tarkio Rvr?

The structure is 172 ft (52.4 m) long with a longest span of 100 ft (30.5 m) and a deck 22 ft wide.

Who owns 250 ST over Tarkio Rvr?

It is owned by the County Highway Agency.