US Bridges

Mo 30 E over Is 55 Is 55

FairPosted for load

St. Louis city, Missouri · S 27 T 45 N R 7 E · Structure no. 891

Built
1965
60 years old, rebuilt 1985
Condition
Fair
inspected August 2023
Type
Box Beam or Girders - Single or Spread
Concrete Continuous
Length
259 ft
2 main spans
Daily traffic
15,557
2024 count
Owner
State
State Highway Agency

About this bridge

Mo 30 E over Is 55 Is 55 is a concrete continuous box beam or girders - single or spread carrying Mo 30 E over Is 55 Is 55 in St. Louis city, Missouri. It was built in 1965 and reconstructed in 1985, so it is 60 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. Its operating status is: posted for load restriction.

It carries about 15,557 vehicles a day, roughly 8% of them trucks, projected to reach 21,780 by 2044. The structure is 259 ft (78.9 m) long and 88 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesMo 30 E
CrossesIs 55 Is 55
LocationS 27 T 45 N R 7 E
RouteState Highway 30
CountySt. Louis city
StateMissouri
Coordinates38.6084, -90.21251
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50.6 US tons
Inventory rating30.8 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadH 20
Structure length259 ft (78.9 m)
Longest span93 ft (28.4 m)
Deck width88 ft (26.7 m)
Roadway width76 ft (23.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,557 (2024)
Projected traffic21,780 by 2044
Trucks8%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.9 mi (3 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$4.7 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Mo 30 E over Is 55 Is 55 built?

It was built in 1965, making it 60 years old in 2025. It was reconstructed in 1985.

What condition is Mo 30 E over Is 55 Is 55 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 August 2023.

How much traffic does Mo 30 E over Is 55 Is 55 carry?

About 15,557 vehicles per day (2024 count), of which roughly 8% are trucks.

How long is Mo 30 E over Is 55 Is 55?

The structure is 259 ft (78.9 m) long with a longest span of 93 ft (28.4 m) and a deck 88 ft wide.

Who owns Mo 30 E over Is 55 Is 55?

It is owned by the State Highway Agency.