SH 52 Ml over White Rock Boulder Ditch
FairBoulder County, Colorado · Niwot at 79th ST Int · Structure no. D-16-Y
- Built
- 1965
- 60 years old
- Condition
- Fair
- inspected September 2023
- Type
- Culvert
- Concrete
- Length
- 26 ft
- 1 main span
- Daily traffic
- 8,900
- 2020 count
- Owner
- State
- State Highway Agency
About this bridge
SH 52 Ml over White Rock Boulder Ditch is a concrete culvert carrying SH 52 Ml over White Rock Boulder Ditch in Boulder County, Colorado. It was built in 1965, so it is 60 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 8,900 vehicles a day, roughly 3% of them trucks, projected to reach 11,837 by 2040. The structure is 26 ft (7.8 m) long and 108 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 |
|---|---|---|
| Channel and channel protection | 8 Very Good | No problems noted. |
| Culvert | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was SH 52 Ml over White Rock Boulder Ditch built?
It was built in 1965, making it 60 years old in 2025.
What condition is SH 52 Ml over White Rock Boulder 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 September 2023.
How much traffic does SH 52 Ml over White Rock Boulder Ditch carry?
About 8,900 vehicles per day (2020 count), of which roughly 3% are trucks.
How long is SH 52 Ml over White Rock Boulder Ditch?
The structure is 26 ft (7.8 m) long with a longest span of 26 ft (7.8 m) and a deck 108 ft wide.
Who owns SH 52 Ml over White Rock Boulder Ditch?
It is owned by the State Highway Agency.