Lower Byrnes Mill over Trib of Big Rvr
FairJefferson County, Missouri · S 3059 T 43 N R 4 E · Structure no. 30993
- Built
- 2004
- 21 years old
- Condition
- Fair
- inspected February 2025
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete
- Length
- 32 ft
- 1 main span
- Daily traffic
- 750
- 2023 count
- Owner
- City
- City or Municipal Highway Agency
About this bridge
Lower Byrnes Mill over Trib of Big Rvr is a prestressed concrete box beam or girders - multiple carrying Lower Byrnes Mill over Trib of Big Rvr in Jefferson County, Missouri. It was built in 2004, so it is 21 years old, younger 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 750 vehicles a day, roughly 2% of them trucks, projected to reach 1,275 by 2043. The structure is 32 ft (9.8 m) long and 24 ft wide. If it were closed, the detour would be 1.2 mi (2 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 7 Good | Some minor problems. |
| 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 Lower Byrnes Mill over Trib of Big Rvr built?
It was built in 2004, making it 21 years old in 2025.
What condition is Lower Byrnes Mill over Trib of Big 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 February 2025.
How much traffic does Lower Byrnes Mill over Trib of Big Rvr carry?
About 750 vehicles per day (2023 count), of which roughly 2% are trucks.
How long is Lower Byrnes Mill over Trib of Big Rvr?
The structure is 32 ft (9.8 m) long with a longest span of 29 ft (8.8 m) and a deck 24 ft wide.
Who owns Lower Byrnes Mill over Trib of Big Rvr?
It is owned by the City or Municipal Highway Agency.