US Bridges

Mo 77 S over UP RR

Fair

Scott County, Missouri · S 1 T 29 N R 12 E · Structure no. 5846

Built
1935
90 years old, rebuilt 1966
Condition
Fair
inspected February 2025
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
179 ft
3 main spans
Daily traffic
4,733
2024 count
Owner
State
State Highway Agency

About this bridge

Mo 77 S over UP RR is a steel continuous stringer/multi-beam or girder carrying Mo 77 S over UP RR in Scott County, Missouri. It was built in 1935 and reconstructed in 1966, so it is 90 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 4,733 vehicles a day, roughly 6% of them trucks, projected to reach 6,863 by 2044. The structure is 179 ft (54.6 m) long and 35 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesMo 77 S
CrossesUP RR
LocationS 1 T 29 N R 12 E
RouteState Highway 77
CountyScott County
StateMissouri
Coordinates37.19865, -89.66746
Functional classRural Major 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.
Substructure7 GoodSome minor problems.
Last inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating41.7 US tons
Inventory rating24.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length179 ft (54.6 m)
Longest span75 ft (22.9 m)
Deck width35 ft (10.6 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,733 (2024)
Projected traffic6,863 by 2044
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed9.9 mi (16 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 Mo 77 S over UP RR built?

It was built in 1935, making it 90 years old in 2025. It was reconstructed in 1966.

What condition is Mo 77 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 February 2025.

How much traffic does Mo 77 S over UP RR carry?

About 4,733 vehicles per day (2024 count), of which roughly 6% are trucks.

How long is Mo 77 S over UP RR?

The structure is 179 ft (54.6 m) long with a longest span of 75 ft (22.9 m) and a deck 35 ft wide.

Who owns Mo 77 S over UP RR?

It is owned by the State Highway Agency.