US Bridges

Old HWY 21 S over Cundiff CR

Fair

Jefferson County, Missouri · S 2018 T 41 N R 4 E · Structure no. 33361

Built
1940
85 years old
Condition
Fair
inspected January 2025
Type
Culvert
Concrete Continuous
Length
45 ft
3 main spans
Daily traffic
3,266
2023 count
Owner
County
County Highway Agency

About this bridge

Old HWY 21 S over Cundiff CR is a concrete continuous culvert carrying Old HWY 21 S over Cundiff CR in Jefferson County, Missouri. It was built in 1940, so it is 85 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 3,266 vehicles a day, roughly 10% of them trucks, projected to reach 6,532 by 2043. The structure is 45 ft (13.8 m) long. If it were closed, the detour would be 29.8 mi (48 km).

Location

Open in Google Maps
CarriesOld HWY 21 S
CrossesCundiff CR
LocationS 2018 T 41 N R 4 E
RouteCounty Highway 0
CountyJefferson County
StateMissouri
Coordinates38.28154, -90.53819
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJanuary 2025
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
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38.7 US tons
Inventory rating23.8 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadHS 20
Structure length45 ft (13.8 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,266 (2023)
Projected traffic6,532 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed29.8 mi (48 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Old HWY 21 S over Cundiff CR built?

It was built in 1940, making it 85 years old in 2025.

What condition is Old HWY 21 S over Cundiff 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 January 2025.

How much traffic does Old HWY 21 S over Cundiff CR carry?

About 3,266 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Old HWY 21 S over Cundiff CR?

The structure is 45 ft (13.8 m) long with a longest span of 10 ft (3 m).

Who owns Old HWY 21 S over Cundiff CR?

It is owned by the County Highway Agency.