US Bridges

Rt Aa S over Alder Br

Fair

Cedar County, Missouri · S 6 T 34 N R 25 W · Structure no. 7046

Built
1961
64 years old
Condition
Fair
inspected January 2024
Type
Culvert
Concrete Continuous
Length
23 ft
2 main spans
Daily traffic
190
2024 count
Owner
State
State Highway Agency

About this bridge

Rt Aa S over Alder Br is a concrete continuous culvert carrying Rt Aa S over Alder Br in Cedar County, Missouri. It was built in 1961, so it is 64 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 190 vehicles a day, roughly 18% of them trucks, projected to reach 276 by 2044. The structure is 23 ft (6.9 m) long and 26 ft wide. If it were closed, the detour would be 21.1 mi (34 km).

Location

Open in Google Maps
CarriesRt Aa S
CrossesAlder Br
LocationS 6 T 34 N R 25 W
RouteState Highway 0AA
CountyCedar County
StateMissouri
Coordinates37.71996, -93.71383
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 inspectionJanuary 2024
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 adequacy7: Better than present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating43.7 US tons
Inventory rating26.8 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadH 10
Structure length23 ft (6.9 m)
Longest span11 ft (3.4 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic190 (2024)
Projected traffic276 by 2044
Trucks18%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed21.1 mi (34 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 Alder Br built?

It was built in 1961, making it 64 years old in 2025.

What condition is Rt Aa S over Alder 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 January 2024.

How much traffic does Rt Aa S over Alder Br carry?

About 190 vehicles per day (2024 count), of which roughly 18% are trucks.

How long is Rt Aa S over Alder Br?

The structure is 23 ft (6.9 m) long with a longest span of 11 ft (3.4 m) and a deck 26 ft wide.

Who owns Rt Aa S over Alder Br?

It is owned by the State Highway Agency.