N 63rd ST (cr 39) over Lefthand Creek
GoodBoulder County, Colorado · 0.4 MI N of Niwot RD · Structure no. BC-39-4.8-LTA
- Built
- 2011
- 14 years old
- Condition
- Good
- inspected February 2025
- Type
- Box Beam or Girders - Single or Spread
- Prestressed Concrete Continuous
- Length
- 125 ft
- 2 main spans
- Daily traffic
- 2,610
- 2021 count
- Owner
- County
- County Highway Agency
About this bridge
N 63rd ST (cr 39) over Lefthand Creek is a prestressed concrete continuous box beam or girders - single or spread carrying N 63rd ST (cr 39) over Lefthand Creek in Boulder County, Colorado. It was built in 2011, so it is 14 years old, younger than the Colorado average of 42.2 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 2,610 vehicles a day, roughly 11% of them trucks, projected to reach 3,132 by 2041. The structure is 125 ft (38.1 m) long and 38 ft wide. If it were closed, the detour would be 3.7 mi (6 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 8 Very Good | No problems noted. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was N 63rd ST (cr 39) over Lefthand Creek built?
It was built in 2011, making it 14 years old in 2025.
What condition is N 63rd ST (cr 39) over Lefthand Creek in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in February 2025.
How much traffic does N 63rd ST (cr 39) over Lefthand Creek carry?
About 2,610 vehicles per day (2021 count), of which roughly 11% are trucks.
How long is N 63rd ST (cr 39) over Lefthand Creek?
The structure is 125 ft (38.1 m) long with a longest span of 57 ft (17.5 m) and a deck 38 ft wide.
Who owns N 63rd ST (cr 39) over Lefthand Creek?
It is owned by the County Highway Agency.