US Bridges

Mo 156 E over North Rvr

Fair

Knox County, Missouri · S 12 T 60 N R 12 W · Structure no. 8590

Built
1964
61 years old
Condition
Fair
inspected November 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
118 ft
3 main spans
Daily traffic
345
2024 count
Owner
State
State Highway Agency

About this bridge

Mo 156 E over North Rvr is a steel stringer/multi-beam or girder carrying Mo 156 E over North Rvr in Knox County, Missouri. It was built in 1964, so it is 61 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 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 345 vehicles a day, roughly 15% of them trucks, projected to reach 500 by 2044. The structure is 118 ft (36 m) long and 29 ft wide. If it were closed, the detour would be 21.1 mi (34 km).

Location

Open in Google Maps
CarriesMo 156 E
CrossesNorth Rvr
LocationS 12 T 60 N R 12 W
RouteState Highway 156
CountyKnox County
StateMissouri
Coordinates40.01265, -92.18016
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating58.5 US tons
Inventory rating34.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length118 ft (36 m)
Longest span45 ft (13.8 m)
Deck width29 ft (8.8 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic345 (2024)
Projected traffic500 by 2044
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed21.1 mi (34 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 Mo 156 E over North Rvr built?

It was built in 1964, making it 61 years old in 2025.

What condition is Mo 156 E over North 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 November 2023.

How much traffic does Mo 156 E over North Rvr carry?

About 345 vehicles per day (2024 count), of which roughly 15% are trucks.

How long is Mo 156 E over North Rvr?

The structure is 118 ft (36 m) long with a longest span of 45 ft (13.8 m) and a deck 29 ft wide.

Who owns Mo 156 E over North Rvr?

It is owned by the State Highway Agency.