US Bridges

County RD 310 over Smith CR

FairPosted for load

Holt County, Missouri · S 11 T 59 N R 37 W · Structure no. 22178

Built
1940
85 years old
Condition
Fair
inspected November 2023
Type
Girder and Floorbeam System
Steel
Length
51 ft
1 main span
Daily traffic
5
2024 count
Owner
County
County Highway Agency

About this bridge

County RD 310 over Smith CR is a steel girder and floorbeam system carrying County RD 310 over Smith CR in Holt County, Missouri. It was built in 1940, so it is 85 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 5 vehicles a day, roughly 10% of them trucks, projected to reach 6 by 2044. The structure is 51 ft (15.5 m) long and 16 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesCounty RD 310
CrossesSmith CR
LocationS 11 T 59 N R 37 W
RouteCounty Highway 343
CountyHolt County
StateMissouri
Coordinates39.95091, -95.01524
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.
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 inspectionNovember 2023
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 adequacy8: Equal to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating6.9 US tons
Inventory rating4 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel
DeckWood or timber
Main spans1
Design loadOther
Structure length51 ft (15.5 m)
Longest span50 ft (15.2 m)
Deck width16 ft (4.9 m)
Roadway width16 ft (4.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5 (2024)
Projected traffic6 by 2044
Trucks10%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$399,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was County RD 310 over Smith CR built?

It was built in 1940, making it 85 years old in 2025.

What condition is County RD 310 over Smith 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 November 2023.

How much traffic does County RD 310 over Smith CR carry?

About 5 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is County RD 310 over Smith CR?

The structure is 51 ft (15.5 m) long with a longest span of 50 ft (15.2 m) and a deck 16 ft wide.

Who owns County RD 310 over Smith CR?

It is owned by the County Highway Agency.