US Bridges

Allen RD over Trib of Sandy CR

Fair

Jefferson County, Missouri · S 18 T 41 N R 5 E · Structure no. 19413

Built
1900
125 years old, rebuilt 1993
Condition
Fair
inspected January 2025
Type
Culvert
Concrete Continuous
Length
27 ft
2 main spans
Daily traffic
200
2023 count
Owner
County
County Highway Agency

About this bridge

Allen RD over Trib of Sandy CR is a concrete continuous culvert carrying Allen RD over Trib of Sandy CR in Jefferson County, Missouri. It was built in 1900 and reconstructed in 1993, so it is 125 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 200 vehicles a day, roughly 10% of them trucks, projected to reach 400 by 2043. The structure is 27 ft (8.2 m) long and 26 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesAllen RD
CrossesTrib of Sandy CR
LocationS 18 T 41 N R 5 E
RouteCounty Highway 186
CountyJefferson County
StateMissouri
Coordinates38.28751, -90.49789
Functional classRural Local

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 within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating54.6 US tons
Inventory rating17.9 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadOther
Structure length27 ft (8.2 m)
Longest span13 ft (3.9 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic200 (2023)
Projected traffic400 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Allen RD over Trib of Sandy CR built?

It was built in 1900, making it 125 years old in 2025. It was reconstructed in 1993.

What condition is Allen RD over Trib of Sandy 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 Allen RD over Trib of Sandy CR carry?

About 200 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Allen RD over Trib of Sandy CR?

The structure is 27 ft (8.2 m) long with a longest span of 13 ft (3.9 m) and a deck 26 ft wide.

Who owns Allen RD over Trib of Sandy CR?

It is owned by the County Highway Agency.