US Bridges

Mo 163 S over Flat Branch

Fair

Boone County, Missouri · S 13 T 48 N R 13 W · Structure no. 73

Built
1957
68 years old
Condition
Fair
inspected September 2023
Type
Culvert
Concrete Continuous
Length
54 ft
2 main spans
Daily traffic
23,094
2024 count
Owner
State
State Highway Agency

About this bridge

Mo 163 S over Flat Branch is a concrete continuous culvert carrying Mo 163 S over Flat Branch in Boone County, Missouri. It was built in 1957, so it is 68 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 23,094 vehicles a day, roughly 4% of them trucks, projected to reach 42,724 by 2044. The structure is 54 ft (16.4 m) long. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesMo 163 S
CrossesFlat Branch
LocationS 13 T 48 N R 13 W
RouteState Highway 163
CountyBoone County
StateMissouri
Coordinates38.94643, -92.33441
Functional classUrban Other Principal Arterial

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 inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating107.1 US tons
Inventory rating64.5 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadH 20
Structure length54 ft (16.4 m)
Longest span13 ft (4 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic23,094 (2024)
Projected traffic42,724 by 2044
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemYes

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 Mo 163 S over Flat Branch built?

It was built in 1957, making it 68 years old in 2025.

What condition is Mo 163 S over Flat 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 September 2023.

How much traffic does Mo 163 S over Flat Branch carry?

About 23,094 vehicles per day (2024 count), of which roughly 4% are trucks.

How long is Mo 163 S over Flat Branch?

The structure is 54 ft (16.4 m) long with a longest span of 13 ft (4 m).

Who owns Mo 163 S over Flat Branch?

It is owned by the State Highway Agency.