US Bridges

Auston RD over Br Old Chnl Grand

Fair

Cass County, Missouri · S 31 T 43 N R 30 W · Structure no. 24920

Built
1935
90 years old
Condition
Fair
inspected April 2023
Type
Slab
Concrete
Length
24 ft
1 main span
Daily traffic
40
2024 count
Owner
County
County Highway Agency

About this bridge

Auston RD over Br Old Chnl Grand is a concrete slab carrying Auston RD over Br Old Chnl Grand in Cass County, Missouri. It was built in 1935, so it is 90 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 6 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 40 vehicles a day, roughly 5% of them trucks, projected to reach 64 by 2044. The structure is 24 ft (7.3 m) long and 14 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesAuston RD
CrossesBr Old Chnl Grand
LocationS 31 T 43 N R 30 W
RouteCounty Highway 579
CountyCass County
StateMissouri
Coordinates38.47704, -94.27075
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
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 statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating54.6 US tons
Inventory rating17.9 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 10
Structure length24 ft (7.3 m)
Longest span22 ft (6.7 m)
Deck width14 ft (4.2 m)
Roadway width12 ft (3.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic40 (2024)
Projected traffic64 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Auston RD over Br Old Chnl Grand built?

It was built in 1935, making it 90 years old in 2025.

What condition is Auston RD over Br Old Chnl Grand 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 Auston RD over Br Old Chnl Grand carry?

About 40 vehicles per day (2024 count), of which roughly 5% are trucks.

How long is Auston RD over Br Old Chnl Grand?

The structure is 24 ft (7.3 m) long with a longest span of 22 ft (6.7 m) and a deck 14 ft wide.

Who owns Auston RD over Br Old Chnl Grand?

It is owned by the County Highway Agency.