US Bridges

Mo 100 E over Caulks CR

Fair

St. Louis County, Missouri · S 6 T 44 N R 4 E · Structure no. 4549

Built
1921
104 years old, rebuilt 1987
Condition
Fair
inspected November 2023
Type
Culvert
Concrete Continuous
Length
25 ft
2 main spans
Daily traffic
30,545
2024 count
Owner
State
State Highway Agency

About this bridge

Mo 100 E over Caulks CR is a concrete continuous culvert carrying Mo 100 E over Caulks CR in St. Louis County, Missouri. It was built in 1921 and reconstructed in 1987, so it is 104 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 30,545 vehicles a day, roughly 7% of them trucks, projected to reach 42,763 by 2044. The structure is 25 ft (7.6 m) long. If it were closed, the detour would be 19.9 mi (32 km).

Location

Open in Google Maps
CarriesMo 100 E
CrossesCaulks CR
LocationS 6 T 44 N R 4 E
RouteState Highway 100
CountySt. Louis County
StateMissouri
Coordinates38.58613, -90.61054
Functional classUrban Other Principal Arterial

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 inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating58.5 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadH 20
Structure length25 ft (7.6 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 traffic30,545 (2024)
Projected traffic42,763 by 2044
Trucks7%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.9 mi (32 km)
TollOn a free road
National Highway SystemYes

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 Mo 100 E over Caulks CR built?

It was built in 1921, making it 104 years old in 2025. It was reconstructed in 1987.

What condition is Mo 100 E over Caulks 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 November 2023.

How much traffic does Mo 100 E over Caulks CR carry?

About 30,545 vehicles per day (2024 count), of which roughly 7% are trucks.

How long is Mo 100 E over Caulks CR?

The structure is 25 ft (7.6 m) long with a longest span of 10 ft (3 m).

Who owns Mo 100 E over Caulks CR?

It is owned by the State Highway Agency.