US Bridges

Is 55 N over Is 57

Good

Scott County, Missouri · S 27 T 26 N R 14 E · Structure no. 696

Built
1962
63 years old, rebuilt 2018
Condition
Good
inspected January 2025
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
274 ft
4 main spans
Daily traffic
10,439
2024 count
Owner
State
State Highway Agency

About this bridge

Is 55 N over Is 57 is a steel continuous stringer/multi-beam or girder carrying Is 55 N over Is 57 in Scott County, Missouri. It was built in 1962 and reconstructed in 2018, so it is 63 years old, older than the Missouri average of 45.1 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 10,439 vehicles a day, roughly 59% of them trucks, projected to reach 19,834 by 2044. The structure is 274 ft (83.5 m) long and 43 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

CarriesIs 55 N
CrossesIs 57
LocationS 27 T 26 N R 14 E
RouteInterstate 55
Coordinates36.87365, -89.53292
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating52.6 US tons
Inventory rating31.7 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length274 ft (83.5 m)
Longest span80 ft (24.4 m)
Deck width43 ft (13 m)
Roadway width39 ft (11.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,439 (2024)
Projected traffic19,834 by 2044
Trucks59%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 Is 55 N over Is 57 built?

It was built in 1962, making it 63 years old in 2025. It was reconstructed in 2018.

What condition is Is 55 N over Is 57 in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in January 2025.

How much traffic does Is 55 N over Is 57 carry?

About 10,439 vehicles per day (2024 count), of which roughly 59% are trucks.

How long is Is 55 N over Is 57?

The structure is 274 ft (83.5 m) long with a longest span of 80 ft (24.4 m) and a deck 43 ft wide.

Who owns Is 55 N over Is 57?

It is owned by the State Highway Agency.