US Bridges

307 ST over Mile CR

Fair

Cass County, Missouri · S 1 T 43 N R 31 W · Structure no. 24861

Built
1910
115 years old, rebuilt 1988
Condition
Fair
inspected April 2023
Type
Tee Beam
Prestressed Concrete Continuous
Length
103 ft
3 main spans
Daily traffic
110
2024 count
Owner
County
County Highway Agency

About this bridge

307 ST over Mile CR is a prestressed concrete continuous tee beam carrying 307 ST over Mile CR in Cass County, Missouri. It was built in 1910 and reconstructed in 1988, so it is 115 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.

It carries about 110 vehicles a day, roughly 5% of them trucks, projected to reach 176 by 2044. The structure is 103 ft (31.4 m) long and 26 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
Carries307 ST
CrossesMile CR
LocationS 1 T 43 N R 31 W
RouteCounty Highway 566
CountyCass County
StateMissouri
Coordinates38.55834, -94.29345
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating54.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadOther
Structure length103 ft (31.4 m)
Longest span34 ft (10.4 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic110 (2024)
Projected traffic176 by 2044
Trucks5%
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 307 ST over Mile CR built?

It was built in 1910, making it 115 years old in 2025. It was reconstructed in 1988.

What condition is 307 ST over 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 307 ST over Mile CR carry?

About 110 vehicles per day (2024 count), of which roughly 5% are trucks.

How long is 307 ST over Mile CR?

The structure is 103 ft (31.4 m) long with a longest span of 34 ft (10.4 m) and a deck 26 ft wide.

Who owns 307 ST over Mile CR?

It is owned by the County Highway Agency.