US Bridges

275 ST over Eight Mile CR

FairPosted for load

Cass County, Missouri · S 7 T 44 N R 30 W · Structure no. 23597

Built
1920
105 years old, rebuilt 1976
Condition
Fair
inspected April 2023
Type
Truss - Thru
Steel
Length
41 ft
1 main span
Daily traffic
45
2024 count
Owner
County
County Highway Agency

About this bridge

275 ST over Eight Mile CR is a steel truss - thru carrying 275 ST over Eight Mile CR in Cass County, Missouri. It was built in 1920 and reconstructed in 1976, so it is 105 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 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 45 vehicles a day, roughly 5% of them trucks, projected to reach 72 by 2044. The structure is 41 ft (12.5 m) long and 14 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
Carries275 ST
CrossesEight Mile CR
LocationS 7 T 44 N R 30 W
RouteCounty Highway 418
CountyCass County
StateMissouri
Coordinates38.61601, -94.27361
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating24.8 US tons
Inventory rating10.9 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 10
Structure length41 ft (12.5 m)
Longest span40 ft (12.2 m)
Deck width14 ft (4.3 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic45 (2024)
Projected traffic72 by 2044
Trucks5%
Lanes on structure1
Traffic directionOne-lane bridge for two-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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$344,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 275 ST over Eight Mile CR built?

It was built in 1920, making it 105 years old in 2025. It was reconstructed in 1976.

What condition is 275 ST over Eight Mile 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 April 2023.

How much traffic does 275 ST over Eight Mile CR carry?

About 45 vehicles per day (2024 count), of which roughly 5% are trucks.

How long is 275 ST over Eight Mile CR?

The structure is 41 ft (12.5 m) long with a longest span of 40 ft (12.2 m) and a deck 14 ft wide.

Who owns 275 ST over Eight Mile CR?

It is owned by the County Highway Agency.