US Bridges

Rt Oo S over Back CR

Fair

St. Francois County, Missouri · S 9 T 35 N R 6 E · Structure no. 5010

Built
1929
96 years old, rebuilt 1974
Condition
Fair
inspected October 2024
Type
Tee Beam
Concrete
Length
128 ft
3 main spans
Daily traffic
4,624
2024 count
Owner
State
State Highway Agency

About this bridge

Rt Oo S over Back CR is a concrete tee beam carrying Rt Oo S over Back CR in St. Francois County, Missouri. It was built in 1929 and reconstructed in 1974, so it is 96 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 4,624 vehicles a day, roughly 11% of them trucks, projected to reach 7,398 by 2044. The structure is 128 ft (39 m) long and 23 ft wide. If it were closed, the detour would be 24.2 mi (39 km).

Location

Open in Google Maps
CarriesRt Oo S
CrossesBack CR
LocationS 9 T 35 N R 6 E
RouteState Highway 0OO
CountySt. Francois County
StateMissouri
Coordinates37.75052, -90.3677
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 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 evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating47.6 US tons
Inventory rating27.8 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length128 ft (39 m)
Longest span43 ft (13 m)
Deck width23 ft (7 m)
Roadway width23 ft (6.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,624 (2024)
Projected traffic7,398 by 2044
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed24.2 mi (39 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.5 million (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Rt Oo S over Back CR built?

It was built in 1929, making it 96 years old in 2025. It was reconstructed in 1974.

What condition is Rt Oo S over Back 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 October 2024.

How much traffic does Rt Oo S over Back CR carry?

About 4,624 vehicles per day (2024 count), of which roughly 11% are trucks.

How long is Rt Oo S over Back CR?

The structure is 128 ft (39 m) long with a longest span of 43 ft (13 m) and a deck 23 ft wide.

Who owns Rt Oo S over Back CR?

It is owned by the State Highway Agency.