US Bridges

Rt W S over Niangua Br

Fair

Webster County, Missouri · S 17 T 31 N R 18 W · Structure no. 6149

Built
1946
79 years old
Condition
Fair
inspected November 2024
Type
Slab
Concrete Continuous
Length
41 ft
3 main spans
Daily traffic
1,704
2024 count
Owner
State
State Highway Agency

About this bridge

Rt W S over Niangua Br is a concrete continuous slab carrying Rt W S over Niangua Br in Webster County, Missouri. It was built in 1946, so it is 79 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 1,704 vehicles a day, roughly 11% of them trucks, projected to reach 2,726 by 2044. The structure is 41 ft (12.5 m) long and 23 ft wide. If it were closed, the detour would be 23 mi (37 km).

Location

Open in Google Maps
CarriesRt W S
CrossesNiangua Br
LocationS 17 T 31 N R 18 W
RouteState Highway 0W
CountyWebster County
StateMissouri
Coordinates37.40428, -92.94363
Functional classRural Major Collector

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 inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating31.7 US tons
Inventory rating18.8 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length41 ft (12.5 m)
Longest span16 ft (4.9 m)
Deck width23 ft (7 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,704 (2024)
Projected traffic2,726 by 2044
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed23 mi (37 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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$595,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Rt W S over Niangua Br built?

It was built in 1946, making it 79 years old in 2025.

What condition is Rt W S over Niangua 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 November 2024.

How much traffic does Rt W S over Niangua Br carry?

About 1,704 vehicles per day (2024 count), of which roughly 11% are trucks.

How long is Rt W S over Niangua Br?

The structure is 41 ft (12.5 m) long with a longest span of 16 ft (4.9 m) and a deck 23 ft wide.

Who owns Rt W S over Niangua Br?

It is owned by the State Highway Agency.