US Bridges

NW Fairmont RD over Br of Third Fork

Fair

DeKalb County, Missouri · S 23 T 59 N R 33 W · Structure no. 21633

Built
1930
95 years old, rebuilt 2012
Condition
Fair
inspected January 2025
Type
Stringer/Multi-beam or Girder
Steel
Length
28 ft
1 main span
Daily traffic
25
2024 count
Owner
County
County Highway Agency

About this bridge

NW Fairmont RD over Br of Third Fork is a steel stringer/multi-beam or girder carrying NW Fairmont RD over Br of Third Fork in DeKalb County, Missouri. It was built in 1930 and reconstructed in 2012, so it is 95 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.

It carries about 25 vehicles a day, roughly 10% of them trucks, projected to reach 29 by 2044. The structure is 28 ft (8.5 m) long and 20 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesNW Fairmont RD
CrossesBr of Third Fork
LocationS 23 T 59 N R 33 W
RouteCounty Highway 316
CountyDeKalb County
StateMissouri
Coordinates39.90771, -94.57101
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
Deck8 Very GoodNo problems noted.
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 inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38.7 US tons
Inventory rating23.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length28 ft (8.5 m)
Longest span27 ft (8.2 m)
Deck width20 ft (6.2 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic25 (2024)
Projected traffic29 by 2044
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 NW Fairmont RD over Br of Third Fork built?

It was built in 1930, making it 95 years old in 2025. It was reconstructed in 2012.

What condition is NW Fairmont RD over Br of Third Fork 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 January 2025.

How much traffic does NW Fairmont RD over Br of Third Fork carry?

About 25 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is NW Fairmont RD over Br of Third Fork?

The structure is 28 ft (8.5 m) long with a longest span of 27 ft (8.2 m) and a deck 20 ft wide.

Who owns NW Fairmont RD over Br of Third Fork?

It is owned by the County Highway Agency.