US Bridges

Is 55 S over Rt M UP RR

Fair

Scott County, Missouri · S 6 T 29 N R 14 E · Structure no. 821

Built
1962
63 years old
Condition
Fair
inspected February 2025
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
283 ft
5 main spans
Daily traffic
18,355
2024 count
Owner
State
State Highway Agency

About this bridge

Is 55 S over Rt M UP RR is a steel continuous stringer/multi-beam or girder carrying Is 55 S over Rt M UP RR in Scott County, Missouri. It was built in 1962, 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 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 18,355 vehicles a day, roughly 21% of them trucks, projected to reach 34,875 by 2044. The structure is 283 ft (86.3 m) long and 43 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesIs 55 S
CrossesRt M UP RR
LocationS 6 T 29 N R 14 E
RouteInterstate 55
CountyScott County
StateMissouri
Coordinates37.21354, -89.54351
Functional classRural Principal Arterial - Interstate

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 inspectionFebruary 2025
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 alignment8: Equal to present desirable criteria
Operating rating53.6 US tons
Inventory rating31.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20 + Mod
Structure length283 ft (86.3 m)
Longest span71 ft (21.5 m)
Deck width43 ft (13 m)
Roadway width39 ft (11.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic18,355 (2024)
Projected traffic34,875 by 2044
Trucks21%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and railroad
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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$2.5 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Is 55 S over Rt M UP RR built?

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

What condition is Is 55 S over Rt M UP RR 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 February 2025.

How much traffic does Is 55 S over Rt M UP RR carry?

About 18,355 vehicles per day (2024 count), of which roughly 21% are trucks.

How long is Is 55 S over Rt M UP RR?

The structure is 283 ft (86.3 m) long with a longest span of 71 ft (21.5 m) and a deck 43 ft wide.

Who owns Is 55 S over Rt M UP RR?

It is owned by the State Highway Agency.