US Bridges

Rt Oo S over Big Rock CR

Fair

Madison County, Missouri · S 2963 T 34 N R 7 E · Structure no. 5238

Built
1929
96 years old, rebuilt 1974
Condition
Fair
inspected October 2024
Type
Tee Beam
Concrete
Length
85 ft
2 main spans
Daily traffic
3,139
2024 count
Owner
State
State Highway Agency

About this bridge

Rt Oo S over Big Rock CR is a concrete tee beam carrying Rt Oo S over Big Rock CR in Madison 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 3,139 vehicles a day, roughly 4% of them trucks, projected to reach 4,395 by 2044. The structure is 85 ft (25.9 m) long and 23 ft wide. If it were closed, the detour would be 26.7 mi (43 km).

Location

Open in Google Maps
CarriesRt Oo S
CrossesBig Rock CR
LocationS 2963 T 34 N R 7 E
RouteState Highway 0OO
CountyMadison County
StateMissouri
Coordinates37.64146, -90.28439
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
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 adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating45.6 US tons
Inventory rating27.8 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadH 15
Structure length85 ft (25.9 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 traffic3,139 (2024)
Projected traffic4,395 by 2044
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed26.7 mi (43 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$1.1 million (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Rt Oo S over Big Rock 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 Big Rock 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 Big Rock CR carry?

About 3,139 vehicles per day (2024 count), of which roughly 4% are trucks.

How long is Rt Oo S over Big Rock CR?

The structure is 85 ft (25.9 m) long with a longest span of 43 ft (13 m) and a deck 23 ft wide.

Who owns Rt Oo S over Big Rock CR?

It is owned by the State Highway Agency.