US Bridges

Steelman RD over Niangua Rvr

Fair

Dallas County, Missouri · S 29 T 34 N R 19 W · Structure no. 31816

Built
2007
18 years old
Condition
Fair
inspected March 2024
Type
Slab
Concrete
Length
135 ft
3 main spans
Daily traffic
250
2023 count
Owner
County
County Highway Agency

About this bridge

Steelman RD over Niangua Rvr is a concrete slab carrying Steelman RD over Niangua Rvr in Dallas County, Missouri. It was built in 2007, so it is 18 years old, younger 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 250 vehicles a day, roughly 10% of them trucks, projected to reach 350 by 2043. The structure is 135 ft (41.1 m) long and 23 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesSteelman RD
CrossesNiangua Rvr
LocationS 29 T 34 N R 19 W
RouteCounty Highway 132
CountyDallas County
StateMissouri
Coordinates37.6416, -93.04395
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.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating79.4 US tons
Inventory rating47.6 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans3
Design loadHS 20
Structure length135 ft (41.1 m)
Longest span43 ft (13.1 m)
Deck width23 ft (7 m)
Roadway width23 ft (7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic250 (2023)
Projected traffic350 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-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 statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Steelman RD over Niangua Rvr built?

It was built in 2007, making it 18 years old in 2025.

What condition is Steelman RD over Niangua Rvr 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 March 2024.

How much traffic does Steelman RD over Niangua Rvr carry?

About 250 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Steelman RD over Niangua Rvr?

The structure is 135 ft (41.1 m) long with a longest span of 43 ft (13.1 m) and a deck 23 ft wide.

Who owns Steelman RD over Niangua Rvr?

It is owned by the County Highway Agency.