IRR Alpine Rd. 58 over Parker Creek
FairModoc County, California · 0.3 MI N of Parker Cr.Rd. · Structure no. 03C0046
- Built
- 1968
- 57 years old, rebuilt 1989
- Condition
- Fair
- inspected August 2023
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 27 ft
- 1 main span
- Daily traffic
- 200
- 2012 count
- Owner
- County
- County Highway Agency
About this bridge
IRR Alpine Rd. 58 over Parker Creek is a steel stringer/multi-beam or girder carrying IRR Alpine Rd. 58 over Parker Creek in Modoc County, California. It was built in 1968 and reconstructed in 1989, so it is 57 years old, older than the California average of 54.8 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 200 vehicles a day, roughly 8% of them trucks, projected to reach 367 by 2041. The structure is 27 ft (8.2 m) long and 22 ft wide. If it were closed, the detour would be 24.9 mi (40 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 | 7 Good | Some minor problems. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was IRR Alpine Rd. 58 over Parker Creek built?
It was built in 1968, making it 57 years old in 2025. It was reconstructed in 1989.
What condition is IRR Alpine Rd. 58 over Parker Creek 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 IRR Alpine Rd. 58 over Parker Creek carry?
About 200 vehicles per day (2012 count), of which roughly 8% are trucks.
How long is IRR Alpine Rd. 58 over Parker Creek?
The structure is 27 ft (8.2 m) long with a longest span of 26 ft (7.9 m) and a deck 22 ft wide.
Who owns IRR Alpine Rd. 58 over Parker Creek?
It is owned by the County Highway Agency.