US Bridges

Mo 180 E over Dawson CR

Fair

St. Louis County, Missouri · S 18 T 46 N R 6 E · Structure no. 3701

Built
1985
40 years old
Condition
Fair
inspected November 2023
Type
Culvert
Concrete Continuous
Length
21 ft
2 main spans
Daily traffic
33,934
2024 count
Owner
State
State Highway Agency

About this bridge

Mo 180 E over Dawson CR is a concrete continuous culvert carrying Mo 180 E over Dawson CR in St. Louis County, Missouri. It was built in 1985, so it is 40 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 33,934 vehicles a day, roughly 3% of them trucks, projected to reach 47,508 by 2044. The structure is 21 ft (6.3 m) long. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesMo 180 E
CrossesDawson CR
LocationS 18 T 46 N R 6 E
RouteState Highway 180
CountySt. Louis County
StateMissouri
Coordinates38.72656, -90.37943
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 protection8 Very GoodNo problems noted.
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 rating59.5 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20
Structure length21 ft (6.3 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 traffic33,934 (2024)
Projected traffic47,508 by 2044
Trucks3%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed0.6 mi (1 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 180 E over Dawson CR built?

It was built in 1985, making it 40 years old in 2025.

What condition is Mo 180 E over Dawson 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 180 E over Dawson CR carry?

About 33,934 vehicles per day (2024 count), of which roughly 3% are trucks.

How long is Mo 180 E over Dawson CR?

The structure is 21 ft (6.3 m) long with a longest span of 10 ft (3 m).

Who owns Mo 180 E over Dawson CR?

It is owned by the State Highway Agency.