US Bridges

Mo 77 S over Main Dtch

FairPosted for load

Mississippi County, Missouri · S 21 T 25 N R 17 E · Structure no. 9132

Built
1935
90 years old
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
115 ft
3 main spans
Daily traffic
297
2024 count
Owner
State
State Highway Agency

About this bridge

Mo 77 S over Main Dtch is a steel stringer/multi-beam or girder carrying Mo 77 S over Main Dtch in Mississippi County, Missouri. It was built in 1935, 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 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 297 vehicles a day, roughly 28% of them trucks, projected to reach 416 by 2044. The structure is 115 ft (35.1 m) long and 21 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

Location

Open in Google Maps
CarriesMo 77 S
CrossesMain Dtch
LocationS 21 T 25 N R 17 E
RouteState Highway 77
CountyMississippi County
StateMissouri
Coordinates36.79824, -89.21137
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionNovember 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating17.9 US tons
Inventory rating10.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadH 10
Structure length115 ft (35.1 m)
Longest span48 ft (14.6 m)
Deck width21 ft (6.5 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic297 (2024)
Projected traffic416 by 2044
Trucks28%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.9 mi (32 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.1 million (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Mo 77 S over Main Dtch built?

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

What condition is Mo 77 S over Main Dtch 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 Mo 77 S over Main Dtch carry?

About 297 vehicles per day (2024 count), of which roughly 28% are trucks.

How long is Mo 77 S over Main Dtch?

The structure is 115 ft (35.1 m) long with a longest span of 48 ft (14.6 m) and a deck 21 ft wide.

Who owns Mo 77 S over Main Dtch?

It is owned by the State Highway Agency.