US Bridges

US 61 N over Salt River

Fair

Ralls County, Missouri · S 36 T 56 N R 5 W · Structure no. 858

Built
1963
62 years old, rebuilt 2015
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
540 ft
5 main spans
Daily traffic
8,731
2024 count
Owner
State
State Highway Agency

About this bridge

US 61 N over Salt River is a steel continuous stringer/multi-beam or girder carrying US 61 N over Salt River in Ralls County, Missouri. It was built in 1963 and reconstructed in 2015, so it is 62 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 8,731 vehicles a day, roughly 34% of them trucks, projected to reach 16,589 by 2044. The structure is 540 ft (164.6 m) long and 33 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

CarriesUS 61 N
CrossesSalt River
LocationS 36 T 56 N R 5 W
RouteU.S. Route 61
Coordinates39.6118, -91.40714
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating53.6 US tons
Inventory rating32.7 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadH 20
Structure length540 ft (164.6 m)
Longest span160 ft (48.8 m)
Deck width33 ft (10 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,731 (2024)
Projected traffic16,589 by 2044
Trucks34%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed0.6 mi (1 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 61 N over Salt River built?

It was built in 1963, making it 62 years old in 2025. It was reconstructed in 2015.

What condition is US 61 N over Salt River 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 June 2024.

How much traffic does US 61 N over Salt River carry?

About 8,731 vehicles per day (2024 count), of which roughly 34% are trucks.

How long is US 61 N over Salt River?

The structure is 540 ft (164.6 m) long with a longest span of 160 ft (48.8 m) and a deck 33 ft wide.

Who owns US 61 N over Salt River?

It is owned by the State Highway Agency.