County Road 1 over New Ish Ditch
FairBoulder County, Colorado · 3.4 MI N of ST HWY 66 · Structure no. WEL001.0-036.0A
- Built
- 1980
- 45 years old
- Condition
- Fair
- inspected March 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 25 ft
- 1 main span
- Daily traffic
- 260
- 2023 count
- Owner
- County
- County Highway Agency
About this bridge
County Road 1 over New Ish Ditch is a steel stringer/multi-beam or girder carrying County Road 1 over New Ish Ditch in Boulder County, Colorado. It was built in 1980, so it is 45 years old, older than the Colorado average of 42.2 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 260 vehicles a day, roughly 18% of them trucks, projected to reach 369 by 2042. The structure is 25 ft (7.6 m) long and 32 ft wide. If it were closed, the detour would be 1.9 mi (3 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was County Road 1 over New Ish Ditch built?
It was built in 1980, making it 45 years old in 2025.
What condition is County Road 1 over New Ish Ditch 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 County Road 1 over New Ish Ditch carry?
About 260 vehicles per day (2023 count), of which roughly 18% are trucks.
How long is County Road 1 over New Ish Ditch?
The structure is 25 ft (7.6 m) long with a longest span of 23 ft (6.9 m) and a deck 32 ft wide.
Who owns County Road 1 over New Ish Ditch?
It is owned by the County Highway Agency.