SH 170 Ml over Davidson Ditch
FairBoulder County, Colorado · 1.5 MI W of JCT SH 93 · Structure no. E-15-AB
- Built
- 1952
- 73 years old
- Condition
- Fair
- inspected March 2025
- Type
- Culvert
- Concrete
- Length
- 24 ft
- 1 main span
- Daily traffic
- 1,200
- 2020 count
- Owner
- State
- State Highway Agency
About this bridge
SH 170 Ml over Davidson Ditch is a concrete culvert carrying SH 170 Ml over Davidson Ditch in Boulder County, Colorado. It was built in 1952, so it is 73 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 1,200 vehicles a day, roughly 5% of them trucks, projected to reach 1,356 by 2040. The structure is 24 ft (7.3 m) long and 46 ft wide. If it were closed, the detour would be 123.7 mi (199 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 | 7 Good | Some minor problems. |
| Culvert | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was SH 170 Ml over Davidson Ditch built?
It was built in 1952, making it 73 years old in 2025.
What condition is SH 170 Ml over Davidson 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 2025.
How much traffic does SH 170 Ml over Davidson Ditch carry?
About 1,200 vehicles per day (2020 count), of which roughly 5% are trucks.
How long is SH 170 Ml over Davidson Ditch?
The structure is 24 ft (7.3 m) long with a longest span of 24 ft (7.3 m) and a deck 46 ft wide.
Who owns SH 170 Ml over Davidson Ditch?
It is owned by the State Highway Agency.