US Bridges

County RD 320 over W Fk Sulphur CR

FairPosted for load

Howard County, Missouri · S 35 T 50 N R 17 W · Structure no. 17398

Built
1968
57 years old
Condition
Fair
inspected February 2024
Type
Girder and Floorbeam System
Steel
Length
39 ft
1 main span
Daily traffic
35
2024 count
Owner
County
County Highway Agency

About this bridge

County RD 320 over W Fk Sulphur CR is a steel girder and floorbeam system carrying County RD 320 over W Fk Sulphur CR in Howard County, Missouri. It was built in 1968, so it is 57 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. Its operating status is: posted for load restriction.

It carries about 35 vehicles a day, roughly 10% of them trucks, projected to reach 39 by 2044. The structure is 39 ft (11.9 m) long and 16 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesCounty RD 320
CrossesW Fk Sulphur CR
LocationS 35 T 50 N R 17 W
RouteCounty Highway 151
CountyHoward County
StateMissouri
Coordinates39.0912, -92.79826
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating6 US tons
Inventory rating3 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadOther
Structure length39 ft (11.9 m)
Longest span37 ft (11.3 m)
Deck width16 ft (5 m)
Roadway width16 ft (5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic35 (2024)
Projected traffic39 by 2044
Trucks10%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$344,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was County RD 320 over W Fk Sulphur CR built?

It was built in 1968, making it 57 years old in 2025.

What condition is County RD 320 over W Fk Sulphur CR 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 2024.

How much traffic does County RD 320 over W Fk Sulphur CR carry?

About 35 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is County RD 320 over W Fk Sulphur CR?

The structure is 39 ft (11.9 m) long with a longest span of 37 ft (11.3 m) and a deck 16 ft wide.

Who owns County RD 320 over W Fk Sulphur CR?

It is owned by the County Highway Agency.