US Bridges

Rt Aa S over Bear Slu

Fair

Audrain County, Missouri · S 33 T 52 N R 6 W · Structure no. 11981

Built
2001
24 years old
Condition
Fair
inspected October 2023
Type
Culvert
Concrete Continuous
Length
45 ft
3 main spans
Daily traffic
318
2024 count
Owner
State
State Highway Agency

About this bridge

Rt Aa S over Bear Slu is a concrete continuous culvert carrying Rt Aa S over Bear Slu in Audrain County, Missouri. It was built in 2001, so it is 24 years old, younger 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 318 vehicles a day, roughly 5% of them trucks, projected to reach 461 by 2044. The structure is 45 ft (13.7 m) long and 56 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesRt Aa S
CrossesBear Slu
LocationS 33 T 52 N R 6 W
RouteState Highway 0AA
CountyAudrain County
StateMissouri
Coordinates39.24456, -91.57724
Functional classRural Minor 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 geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating110.1 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadHS 20
Structure length45 ft (13.7 m)
Longest span14 ft (4.3 m)
Deck width56 ft (17 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic318 (2024)
Projected traffic461 by 2044
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 Aa S over Bear Slu built?

It was built in 2001, making it 24 years old in 2025.

What condition is Rt Aa S over Bear Slu 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 Aa S over Bear Slu carry?

About 318 vehicles per day (2024 count), of which roughly 5% are trucks.

How long is Rt Aa S over Bear Slu?

The structure is 45 ft (13.7 m) long with a longest span of 14 ft (4.3 m) and a deck 56 ft wide.

Who owns Rt Aa S over Bear Slu?

It is owned by the State Highway Agency.