US Bridges

Rt Bb S over North Rvr

PoorPosted for load

Knox County, Missouri · S 35 T 60 N R 11 W · Structure no. 8025

Built
1955
70 years old
Condition
Poor
inspected January 2025
Type
Stringer/Multi-beam or Girder
Steel
Length
137 ft
3 main spans
Daily traffic
32
2024 count
Owner
State
State Highway Agency

About this bridge

Rt Bb S over North Rvr is a steel stringer/multi-beam or girder carrying Rt Bb S over North Rvr in Knox County, Missouri. It was built in 1955, so it is 70 years old, older than the Missouri average of 45.1 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 3 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 32 vehicles a day, roughly 13% of them trucks, projected to reach 46 by 2044. The structure is 137 ft (41.8 m) long and 22 ft wide. If it were closed, the detour would be 21.7 mi (35 km).

CarriesRt Bb S
CrossesNorth Rvr
LocationS 35 T 60 N R 11 W
RouteState Highway 0BB
Coordinates39.96438, -92.09598
Functional classRural Minor Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2025
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be 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 rating22.8 US tons
Inventory rating13.9 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadH 10
Structure length137 ft (41.8 m)
Longest span45 ft (13.7 m)
Deck width22 ft (6.8 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic32 (2024)
Projected traffic46 by 2044
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed21.7 mi (35 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.3 million (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Rt Bb S over North Rvr built?

It was built in 1955, making it 70 years old in 2025.

What condition is Rt Bb S over North Rvr in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in January 2025.

How much traffic does Rt Bb S over North Rvr carry?

About 32 vehicles per day (2024 count), of which roughly 13% are trucks.

How long is Rt Bb S over North Rvr?

The structure is 137 ft (41.8 m) long with a longest span of 45 ft (13.7 m) and a deck 22 ft wide.

Who owns Rt Bb S over North Rvr?

It is owned by the State Highway Agency.