Is 55 S over Br Muddy CR

Fair

Jefferson County, Missouri · S 34 T 40 N R 6 E · Structure no. 1667

Built: 1969; 56 years old
Condition: Fair; inspected December 2024
Type: Culvert; Concrete Continuous
Length: 22 ft; 2 main spans
Daily traffic: 27,080; 2024 count
Owner: State; State Highway Agency

About this bridge

Is 55 S over Br Muddy CR is a concrete continuous culvert carrying Is 55 S over Br Muddy CR in Jefferson County, Missouri. It was built in 1969, so it is 56 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 27,080 vehicles a day, roughly 30% of them trucks, projected to reach 50,098 by 2044. The structure is 22 ft (6.6 m) long. If it were closed, the detour would be 0.6 mi (1 km).

Location

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CarriesIs 55 S

CrossesBr Muddy CR

LocationS 34 T 40 N R 6 E

RouteInterstate 55

CountyJefferson County

StateMissouri

Coordinates38.14341, -90.33587

Functional classRural Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

Component	Rating	Meaning
Channel and channel protection	6 Satisfactory	Structural elements show some minor deterioration.
Culvert	6 Satisfactory	Structural elements show some minor deterioration.

Last inspectionDecember 2024

Inspection intervalevery 24 months

Operating statusOpen, no restriction

ScourFoundations stable; scour above top of footing

Structural evaluation6: Equal to present minimum criteria

Waterway adequacy8: Equal to present desirable criteria

Approach roadway alignment8: Equal to present desirable criteria

Operating rating110.1 US tons

Inventory rating110.1 US tons

Structure

Structure typeCulvert

MaterialConcrete Continuous

DeckNot applicable

Main spans2

Design loadHS 20

Structure length22 ft (6.6 m)

Longest span10 ft (3 m)

Deck width0 ft (0 m)

Roadway width0 ft (0 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic27,080 (2024)

Projected traffic50,098 by 2044

Trucks30%

Lanes on structure4

Traffic directionTwo-way traffic

CarriesHighway

CrossesWaterway

Detour if closed0.6 mi (1 km)

TollOn a free road

National Highway SystemYes

Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency

Maintained byState 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 Is 55 S over Br Muddy CR built?

It was built in 1969, making it 56 years old in 2025.

What condition is Is 55 S over Br Muddy 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 December 2024.

How much traffic does Is 55 S over Br Muddy CR carry?

About 27,080 vehicles per day (2024 count), of which roughly 30% are trucks.

How long is Is 55 S over Br Muddy CR?

The structure is 22 ft (6.6 m) long with a longest span of 10 ft (3 m).

Who owns Is 55 S over Br Muddy CR?

It is owned by the State Highway Agency.