US Bridges

Armor RD over Smokey Br

FairPosted for load

Linn County, Missouri · S 35 T 59 N R 22 W · Structure no. 20875

Built
1955
70 years old
Condition
Fair
inspected December 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
28 ft
1 main span
Daily traffic
10
2024 count
Owner
County
County Highway Agency

About this bridge

Armor RD over Smokey Br is a steel stringer/multi-beam or girder carrying Armor RD over Smokey Br in Linn County, Missouri. It was built in 1955, so it is 70 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 10 vehicles a day, roughly 10% of them trucks, projected to reach 11 by 2044. The structure is 28 ft (8.5 m) long and 14 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesArmor RD
CrossesSmokey Br
LocationS 35 T 59 N R 22 W
RouteCounty Highway 278
CountyLinn County
StateMissouri
Coordinates39.88822, -93.32501
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 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 geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating12.9 US tons
Inventory rating8.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckWood or timber
Main spans1
Design loadOther
Structure length28 ft (8.5 m)
Longest span27 ft (8.2 m)
Deck width14 ft (4.3 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10 (2024)
Projected traffic11 by 2044
Trucks10%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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$272,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Armor RD over Smokey Br built?

It was built in 1955, making it 70 years old in 2025.

What condition is Armor RD over Smokey Br 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 December 2024.

How much traffic does Armor RD over Smokey Br carry?

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

How long is Armor RD over Smokey Br?

The structure is 28 ft (8.5 m) long with a longest span of 27 ft (8.2 m) and a deck 14 ft wide.

Who owns Armor RD over Smokey Br?

It is owned by the County Highway Agency.