Folsom Street over Boulder Whiterock Ditch
FairBoulder County, Colorado · 20 Ft N of Pearl Street · Structure no. BOLD-04-0.39-03
- Built
- 1970
- 55 years old
- Condition
- Fair
- inspected February 2025
- Type
- Slab
- Concrete
- Length
- 23 ft
- 1 main span
- Daily traffic
- 13,574
- 2023 count
- Owner
- City
- City or Municipal Highway Agency
About this bridge
Folsom Street over Boulder Whiterock Ditch is a concrete slab carrying Folsom Street over Boulder Whiterock Ditch in Boulder County, Colorado. It was built in 1970, so it is 55 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 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 13,574 vehicles a day, roughly 5% of them trucks, projected to reach 16,289 by 2043. The structure is 23 ft (7 m) long and 78 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Folsom Street over Boulder Whiterock Ditch built?
It was built in 1970, making it 55 years old in 2025.
What condition is Folsom Street over Boulder Whiterock 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 February 2025.
How much traffic does Folsom Street over Boulder Whiterock Ditch carry?
About 13,574 vehicles per day (2023 count), of which roughly 5% are trucks.
How long is Folsom Street over Boulder Whiterock Ditch?
The structure is 23 ft (7 m) long with a longest span of 22 ft (6.7 m) and a deck 78 ft wide.
Who owns Folsom Street over Boulder Whiterock Ditch?
It is owned by the City or Municipal Highway Agency.