US Bridges

Is 49 N over Marmaton Rvr

Fair

Vernon County, Missouri · S 9 T 36 N R 31 W · Structure no. 291

Built
1958
67 years old, rebuilt 2005
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
486 ft
3 main spans
Daily traffic
5,535
2024 count
Owner
State
State Highway Agency

About this bridge

Is 49 N over Marmaton Rvr is a steel continuous stringer/multi-beam or girder carrying Is 49 N over Marmaton Rvr in Vernon County, Missouri. It was built in 1958 and reconstructed in 2005, so it is 67 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 5,535 vehicles a day, roughly 32% of them trucks, projected to reach 9,686 by 2044. The structure is 486 ft (148.1 m) long and 40 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesIs 49 N
CrossesMarmaton Rvr
LocationS 9 T 36 N R 31 W
RouteInterstate 49
CountyVernon County
StateMissouri
Coordinates37.9199, -94.36005
Functional classRural Principal Arterial - Interstate

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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.5 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3 (+4 approach)
Design loadH 20
Structure length486 ft (148.1 m)
Longest span100 ft (30.5 m)
Deck width40 ft (12.2 m)
Roadway width37 ft (11.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,535 (2024)
Projected traffic9,686 by 2044
Trucks32%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 Is 49 N over Marmaton Rvr built?

It was built in 1958, making it 67 years old in 2025. It was reconstructed in 2005.

What condition is Is 49 N over Marmaton 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 July 2023.

How much traffic does Is 49 N over Marmaton Rvr carry?

About 5,535 vehicles per day (2024 count), of which roughly 32% are trucks.

How long is Is 49 N over Marmaton Rvr?

The structure is 486 ft (148.1 m) long with a longest span of 100 ft (30.5 m) and a deck 40 ft wide.

Who owns Is 49 N over Marmaton Rvr?

It is owned by the State Highway Agency.