US Bridges

County RD 403 over South Rvr

Fair

Marion County, Missouri · S 31 T 58 N R 5 W · Structure no. 18369

Built
1986
39 years old
Condition
Fair
inspected February 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
91 ft
3 main spans
Daily traffic
100
2023 count
Owner
County
County Highway Agency

About this bridge

County RD 403 over South Rvr is a prestressed concrete continuous stringer/multi-beam or girder carrying County RD 403 over South Rvr in Marion County, Missouri. It was built in 1986, so it is 39 years old, younger 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.

It carries about 100 vehicles a day, roughly 10% of them trucks, projected to reach 125 by 2043. The structure is 91 ft (27.7 m) long and 27 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesCounty RD 403
CrossesSouth Rvr
LocationS 31 T 58 N R 5 W
RouteCounty Highway 183
CountyMarion County
StateMissouri
Coordinates39.78333, -91.501
Functional classRural 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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
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 inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating54.6 US tons
Inventory rating17.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, precast panels
Main spans3
Design loadH 15
Structure length91 ft (27.7 m)
Longest span48 ft (14.6 m)
Deck width27 ft (8.1 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2023)
Projected traffic125 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was County RD 403 over South Rvr built?

It was built in 1986, making it 39 years old in 2025.

What condition is County RD 403 over South Rvr 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 2023.

How much traffic does County RD 403 over South Rvr carry?

About 100 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is County RD 403 over South Rvr?

The structure is 91 ft (27.7 m) long with a longest span of 48 ft (14.6 m) and a deck 27 ft wide.

Who owns County RD 403 over South Rvr?

It is owned by the County Highway Agency.