US Bridges

Sidney ST E over Is 55

Fair

St. Louis city, Missouri · S 27 T 45 N R 7 E · Structure no. 890

Built
1964
61 years old, rebuilt 1985
Condition
Fair
inspected August 2023
Type
Box Beam or Girders - Single or Spread
Concrete Continuous
Length
237 ft
4 main spans
Daily traffic
2,072
2024 count
Owner
State
State Highway Agency

About this bridge

Sidney ST E over Is 55 is a concrete continuous box beam or girders - single or spread carrying Sidney ST E over Is 55 in St. Louis city, Missouri. It was built in 1964 and reconstructed in 1985, so it is 61 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 2,072 vehicles a day, roughly 3% of them trucks, projected to reach 3,108 by 2044. The structure is 237 ft (72.2 m) long and 48 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesSidney ST E
CrossesIs 55
LocationS 27 T 45 N R 7 E
RouteCity Street 0
CountySt. Louis city
StateMissouri
Coordinates38.6028, -90.2146
Functional classUrban Collector

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 inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating68.5 US tons
Inventory rating37.7 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadH 20
Structure length237 ft (72.2 m)
Longest span72 ft (21.9 m)
Deck width48 ft (14.5 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,072 (2024)
Projected traffic3,108 by 2044
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

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 Sidney ST E over Is 55 built?

It was built in 1964, making it 61 years old in 2025. It was reconstructed in 1985.

What condition is Sidney ST E over 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 Sidney ST E over Is 55 carry?

About 2,072 vehicles per day (2024 count), of which roughly 3% are trucks.

How long is Sidney ST E over Is 55?

The structure is 237 ft (72.2 m) long with a longest span of 72 ft (21.9 m) and a deck 48 ft wide.

Who owns Sidney ST E over Is 55?

It is owned by the State Highway Agency.