Eighteenth Street over I 84;EIGHTEENTH ST Gs
FairElmore County, Idaho · 1.0 W. Mountain Home · Structure no. 000000000027890
- Built
- 1971
- 54 years old
- Condition
- Fair
- inspected March 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 301 ft
- 2 main spans
- Daily traffic
- 1,600
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
Eighteenth Street over I 84;EIGHTEENTH ST Gs is a steel continuous stringer/multi-beam or girder carrying Eighteenth Street over I 84;EIGHTEENTH ST Gs in Elmore County, Idaho. It was built in 1971, so it is 54 years old, older than the Idaho average of 45.3 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 1,600 vehicles a day, roughly 3% of them trucks, projected to reach 2,400 by 2042. The structure is 301 ft (91.7 m) long and 33 ft wide.
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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Eighteenth Street over I 84;EIGHTEENTH ST Gs built?
It was built in 1971, making it 54 years old in 2025.
What condition is Eighteenth Street over I 84;EIGHTEENTH ST Gs 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 March 2024.
How much traffic does Eighteenth Street over I 84;EIGHTEENTH ST Gs carry?
About 1,600 vehicles per day (2023 count), of which roughly 3% are trucks.
How long is Eighteenth Street over I 84;EIGHTEENTH ST Gs?
The structure is 301 ft (91.7 m) long with a longest span of 117 ft (35.8 m) and a deck 33 ft wide.
Who owns Eighteenth Street over I 84;EIGHTEENTH ST Gs?
It is owned by the State Highway Agency.