US Bridges

US 54 E over Niangua Arm Lake O

Fair

Camden County, Missouri · S 27 T 38 N R 17 W · Structure no. 11942

Built
1999
26 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
1,251 ft
6 main spans
Daily traffic
8,182
2024 count
Owner
State
State Highway Agency

About this bridge

US 54 E over Niangua Arm Lake O is a steel continuous stringer/multi-beam or girder carrying US 54 E over Niangua Arm Lake O in Camden County, Missouri. It was built in 1999, so it is 26 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 5 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 8,182 vehicles a day, roughly 11% of them trucks, projected to reach 18,819 by 2044. The structure is 1,251 ft (381.3 m) long and 46 ft wide. If it were closed, the detour would be 34.2 mi (55 km).

Location

Open in Google Maps
CarriesUS 54 E
CrossesNiangua Arm Lake O
LocationS 27 T 38 N R 17 W
RouteU.S. Route 54
CountyCamden County
StateMissouri
Coordinates37.99676, -92.78921
Functional classUrban Other Principal Arterial

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating94.2 US tons
Inventory rating56.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans6
Design loadHS 25 or greater
Structure length1,251 ft (381.3 m)
Longest span223 ft (68 m)
Deck width46 ft (14 m)
Roadway width43 ft (13.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,182 (2024)
Projected traffic18,819 by 2044
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed34.2 mi (55 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was US 54 E over Niangua Arm Lake O built?

It was built in 1999, making it 26 years old in 2025.

What condition is US 54 E over Niangua Arm Lake O 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 August 2024.

How much traffic does US 54 E over Niangua Arm Lake O carry?

About 8,182 vehicles per day (2024 count), of which roughly 11% are trucks.

How long is US 54 E over Niangua Arm Lake O?

The structure is 1,251 ft (381.3 m) long with a longest span of 223 ft (68 m) and a deck 46 ft wide.

Who owns US 54 E over Niangua Arm Lake O?

It is owned by the State Highway Agency.