US Bridges

Mo 99 S over Birch Br

Fair

Shannon County, Missouri · S 22 T 27 N R 5 W · Structure no. 5739

Built
1934
91 years old
Condition
Fair
inspected December 2024
Type
Culvert
Concrete Continuous
Length
38 ft
3 main spans
Daily traffic
2,240
2024 count
Owner
State
State Highway Agency

About this bridge

Mo 99 S over Birch Br is a concrete continuous culvert carrying Mo 99 S over Birch Br in Shannon County, Missouri. It was built in 1934, so it is 91 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 2,240 vehicles a day, roughly 24% of them trucks, projected to reach 3,136 by 2044. The structure is 38 ft (11.6 m) long and 41 ft wide. If it were closed, the detour would be 28 mi (45 km).

Location

Open in Google Maps
CarriesMo 99 S
CrossesBirch Br
LocationS 22 T 27 N R 5 W
RouteState Highway 99
CountyShannon County
StateMissouri
Coordinates36.99224, -91.49298
Functional classRural Major Collector

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 protection7 GoodSome minor problems.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionDecember 2024
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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating84.3 US tons
Inventory rating50.6 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length38 ft (11.6 m)
Longest span12 ft (3.7 m)
Deck width41 ft (12.5 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,240 (2024)
Projected traffic3,136 by 2044
Trucks24%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed28 mi (45 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Mo 99 S over Birch Br built?

It was built in 1934, making it 91 years old in 2025.

What condition is Mo 99 S over Birch Br 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 Mo 99 S over Birch Br carry?

About 2,240 vehicles per day (2024 count), of which roughly 24% are trucks.

How long is Mo 99 S over Birch Br?

The structure is 38 ft (11.6 m) long with a longest span of 12 ft (3.7 m) and a deck 41 ft wide.

Who owns Mo 99 S over Birch Br?

It is owned by the State Highway Agency.