US Bridges

Mo 180 W over Is 70

Fair

St. Louis County, Missouri · S 12 T 46 N R 5 E · Structure no. 6572

Built
1957
68 years old, rebuilt 1973
Condition
Fair
inspected September 2024
Type
Box Beam or Girders - Single or Spread
Concrete Continuous
Length
499 ft
4 main spans
Daily traffic
11,183
2024 count
Owner
State
State Highway Agency

About this bridge

Mo 180 W over Is 70 is a concrete continuous box beam or girders - single or spread carrying Mo 180 W over Is 70 in St. Louis County, Missouri. It was built in 1957 and reconstructed in 1973, so it is 68 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 11,183 vehicles a day, roughly 5% of them trucks, projected to reach 15,656 by 2044. The structure is 499 ft (152.1 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesMo 180 W
CrossesIs 70
LocationS 12 T 46 N R 5 E
RouteState Highway 180
CountySt. Louis County
StateMissouri
Coordinates38.7439, -90.41236
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment7: Better than present minimum criteria
Operating rating57.5 US tons
Inventory rating34.7 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length499 ft (152.1 m)
Longest span150 ft (45.7 m)
Deck width44 ft (13.4 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,183 (2024)
Projected traffic15,656 by 2044
Trucks5%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$4.2 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Mo 180 W over Is 70 built?

It was built in 1957, making it 68 years old in 2025. It was reconstructed in 1973.

What condition is Mo 180 W over Is 70 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 September 2024.

How much traffic does Mo 180 W over Is 70 carry?

About 11,183 vehicles per day (2024 count), of which roughly 5% are trucks.

How long is Mo 180 W over Is 70?

The structure is 499 ft (152.1 m) long with a longest span of 150 ft (45.7 m) and a deck 44 ft wide.

Who owns Mo 180 W over Is 70?

It is owned by the State Highway Agency.