US Bridges

Mo 100 W over Is 270 Rp IS270W to MO1

Fair

St. Louis County, Missouri · S 34 T 45 N R 5 E · Structure no. 12031

Built
1999
26 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
1,491 ft
19 main spans
Daily traffic
23,839
2024 count
Owner
State
State Highway Agency

About this bridge

Mo 100 W over Is 270 Rp IS270W to MO1 is a steel continuous stringer/multi-beam or girder carrying Mo 100 W over Is 270 Rp IS270W to MO1 in St. Louis County, Missouri. It was built in 1999, so it is 26 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 23,839 vehicles a day, roughly 9% of them trucks, projected to reach 33,375 by 2044. The structure is 1,491 ft (454.5 m) long and 67 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesMo 100 W
CrossesIs 270 Rp IS270W to MO1
LocationS 34 T 45 N R 5 E
RouteState Highway 100
CountySt. Louis County
StateMissouri
Coordinates38.60383, -90.45194
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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating74.4 US tons
Inventory rating44.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans19
Design loadHS 25 or greater
Structure length1,491 ft (454.5 m)
Longest span135 ft (41 m)
Deck width67 ft (20.4 m)
Roadway width64 ft (19.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic23,839 (2024)
Projected traffic33,375 by 2044
Trucks9%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Mo 100 W over Is 270 Rp IS270W to MO1 built?

It was built in 1999, making it 26 years old in 2025.

What condition is Mo 100 W over Is 270 Rp IS270W to MO1 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 June 2024.

How much traffic does Mo 100 W over Is 270 Rp IS270W to MO1 carry?

About 23,839 vehicles per day (2024 count), of which roughly 9% are trucks.

How long is Mo 100 W over Is 270 Rp IS270W to MO1?

The structure is 1,491 ft (454.5 m) long with a longest span of 135 ft (41 m) and a deck 67 ft wide.

Who owns Mo 100 W over Is 270 Rp IS270W to MO1?

It is owned by the State Highway Agency.