US Bridges

County RD 350 over S Fk of Salt Rvr

Fair

Audrain County, Missouri · S 24 T 52 N R 9 W · Structure no. 25185

Built
1937
88 years old
Condition
Fair
inspected April 2023
Type
Girder and Floorbeam System
Steel
Length
104 ft
1 main span
Daily traffic
75
2023 count
Owner
County
County Highway Agency

About this bridge

County RD 350 over S Fk of Salt Rvr is a steel girder and floorbeam system carrying County RD 350 over S Fk of Salt Rvr in Audrain County, Missouri. It was built in 1937, so it is 88 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.

It carries about 75 vehicles a day, roughly 10% of them trucks, projected to reach 94 by 2043. The structure is 104 ft (31.7 m) long and 23 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesCounty RD 350
CrossesS Fk of Salt Rvr
LocationS 24 T 52 N R 9 W
RouteCounty Highway 661
CountyAudrain County
StateMissouri
Coordinates39.26897, -91.85825
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating27.8 US tons
Inventory rating13.9 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadOther
Structure length104 ft (31.7 m)
Longest span101 ft (30.8 m)
Deck width23 ft (7 m)
Roadway width23 ft (6.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic75 (2023)
Projected traffic94 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was County RD 350 over S Fk of Salt Rvr built?

It was built in 1937, making it 88 years old in 2025.

What condition is County RD 350 over S Fk of Salt 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 April 2023.

How much traffic does County RD 350 over S Fk of Salt Rvr carry?

About 75 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is County RD 350 over S Fk of Salt Rvr?

The structure is 104 ft (31.7 m) long with a longest span of 101 ft (30.8 m) and a deck 23 ft wide.

Who owns County RD 350 over S Fk of Salt Rvr?

It is owned by the County Highway Agency.