US Bridges

Or 55 S over UP RR

FairPosted for load

Jefferson County, Missouri · S 420 T 41 N R 6 E · Structure no. 708

Built
1964
61 years old
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
160 ft
3 main spans
Daily traffic
2,316
2024 count
Owner
State
State Highway Agency

About this bridge

Or 55 S over UP RR is a steel continuous stringer/multi-beam or girder carrying Or 55 S over UP RR in Jefferson County, Missouri. It was built in 1964, 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 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 2,316 vehicles a day, roughly 3% of them trucks, projected to reach 4,169 by 2044. The structure is 160 ft (48.8 m) long and 30 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesOr 55 S
CrossesUP RR
LocationS 420 T 41 N R 6 E
RouteState Highway 55
CountyJefferson County
StateMissouri
Coordinates38.28327, -90.40423
Functional classUrban Local

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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
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 geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment8: Equal to present desirable criteria
Operating rating31.7 US tons
Inventory rating19.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length160 ft (48.8 m)
Longest span60 ft (18.3 m)
Deck width30 ft (9.1 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,316 (2024)
Projected traffic4,169 by 2044
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed1.9 mi (3 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$1.1 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Or 55 S over UP RR built?

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

What condition is Or 55 S over 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 November 2024.

How much traffic does Or 55 S over UP RR carry?

About 2,316 vehicles per day (2024 count), of which roughly 3% are trucks.

How long is Or 55 S over UP RR?

The structure is 160 ft (48.8 m) long with a longest span of 60 ft (18.3 m) and a deck 30 ft wide.

Who owns Or 55 S over UP RR?

It is owned by the State Highway Agency.