US Bridges

Rt O S over Elm Br

Fair

Audrain County, Missouri · S 35 T 53 N R 8 W · Structure no. 6870

Built
1956
69 years old
Condition
Fair
inspected October 2023
Type
Culvert
Concrete Continuous
Length
21 ft
2 main spans
Daily traffic
195
2024 count
Owner
State
State Highway Agency

About this bridge

Rt O S over Elm Br is a concrete continuous culvert carrying Rt O S over Elm Br in Audrain County, Missouri. It was built in 1956, so it is 69 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 195 vehicles a day, roughly 13% of them trucks, projected to reach 283 by 2044. The structure is 21 ft (6.3 m) long and 29 ft wide. If it were closed, the detour would be 19.3 mi (31 km).

Location

Open in Google Maps
CarriesRt O S
CrossesElm Br
LocationS 35 T 53 N R 8 W
RouteState Highway 0O
CountyAudrain County
StateMissouri
Coordinates39.33151, -91.76433
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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating46.6 US tons
Inventory rating27.8 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadH 10
Structure length21 ft (6.3 m)
Longest span10 ft (3 m)
Deck width29 ft (8.8 m)
Roadway width27 ft (8.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic195 (2024)
Projected traffic283 by 2044
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.3 mi (31 km)
TollOn a free road
National Highway SystemNo

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 Rt O S over Elm Br built?

It was built in 1956, making it 69 years old in 2025.

What condition is Rt O S over Elm 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 October 2023.

How much traffic does Rt O S over Elm Br carry?

About 195 vehicles per day (2024 count), of which roughly 13% are trucks.

How long is Rt O S over Elm Br?

The structure is 21 ft (6.3 m) long with a longest span of 10 ft (3 m) and a deck 29 ft wide.

Who owns Rt O S over Elm Br?

It is owned by the State Highway Agency.