US Bridges

County RD 457 over Unknown Branch

Fair

Callaway County, Missouri · S 35 T 46 N R 8 W · Structure no. 22054

Built
1975
50 years old, rebuilt 1986
Condition
Fair
inspected October 2024
Type
Culvert
Concrete Continuous
Length
30 ft
2 main spans
Daily traffic
35
2023 count
Owner
County
County Highway Agency

About this bridge

County RD 457 over Unknown Branch is a concrete continuous culvert carrying County RD 457 over Unknown Branch in Callaway County, Missouri. It was built in 1975 and reconstructed in 1986, 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 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 35 vehicles a day, roughly 5% of them trucks, projected to reach 53 by 2043. The structure is 30 ft (9.1 m) long and 27 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesCounty RD 457
CrossesUnknown Branch
LocationS 35 T 46 N R 8 W
RouteCounty Highway 338
CountyCallaway County
StateMissouri
Coordinates38.71281, -91.79506
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating54.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadOther
Structure length30 ft (9.1 m)
Longest span14 ft (4.3 m)
Deck width27 ft (8.2 m)
Roadway width25 ft (7.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic35 (2023)
Projected traffic53 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 County RD 457 over Unknown Branch built?

It was built in 1975, making it 50 years old in 2025. It was reconstructed in 1986.

What condition is County RD 457 over Unknown Branch 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 October 2024.

How much traffic does County RD 457 over Unknown Branch carry?

About 35 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is County RD 457 over Unknown Branch?

The structure is 30 ft (9.1 m) long with a longest span of 14 ft (4.3 m) and a deck 27 ft wide.

Who owns County RD 457 over Unknown Branch?

It is owned by the County Highway Agency.