E Airport RD over 6th Ave N Bypass 21
FairYellowstone County, Montana · Billings-E Airport RD · Structure no. U01014002+05171
- Built
- 2009
- 16 years old
- Condition
- Fair
- inspected August 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 141 ft
- 3 main spans
- Daily traffic
- 10,544
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
E Airport RD over 6th Ave N Bypass 21 is a prestressed concrete stringer/multi-beam or girder carrying E Airport RD over 6th Ave N Bypass 21 in Yellowstone County, Montana. It was built in 2009, so it is 16 years old, younger than the Montana average of 47 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 10,544 vehicles a day, roughly 3% of them trucks, projected to reach 11,124 by 2043. The structure is 141 ft (43 m) long and 102 ft wide. If it were closed, the detour would be 123.7 mi (199 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 | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was E Airport RD over 6th Ave N Bypass 21 built?
It was built in 2009, making it 16 years old in 2025.
What condition is E Airport RD over 6th Ave N Bypass 21 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 August 2023.
How much traffic does E Airport RD over 6th Ave N Bypass 21 carry?
About 10,544 vehicles per day (2023 count), of which roughly 3% are trucks.
How long is E Airport RD over 6th Ave N Bypass 21?
The structure is 141 ft (43 m) long with a longest span of 82 ft (25 m) and a deck 102 ft wide.
Who owns E Airport RD over 6th Ave N Bypass 21?
It is owned by the State Highway Agency.