NW 800 over Knob CR
GoodHenry County, Missouri · S 30 T 43 N R 28 W · Structure no. 34562
- Built
- 2014
- 11 years old
- Condition
- Good
- inspected March 2023
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete
- Length
- 59 ft
- 1 main span
- Daily traffic
- 30
- 2023 count
- Owner
- County
- County Highway Agency
About this bridge
NW 800 over Knob CR is a prestressed concrete box beam or girders - multiple carrying NW 800 over Knob CR in Henry County, Missouri. It was built in 2014, so it is 11 years old, younger than the Missouri average of 45.1 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 30 vehicles a day, roughly 10% of them trucks, projected to reach 42 by 2043. The structure is 59 ft (18 m) long and 24 ft wide. If it were closed, the detour would be 1.9 mi (3 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 8 Very Good | No problems noted. |
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was NW 800 over Knob CR built?
It was built in 2014, making it 11 years old in 2025.
What condition is NW 800 over Knob CR in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in March 2023.
How much traffic does NW 800 over Knob CR carry?
About 30 vehicles per day (2023 count), of which roughly 10% are trucks.
How long is NW 800 over Knob CR?
The structure is 59 ft (18 m) long with a longest span of 56 ft (17.1 m) and a deck 24 ft wide.
Who owns NW 800 over Knob CR?
It is owned by the County Highway Agency.