N 81st ST (cr 31) over Left Hand Creek
GoodBoulder County, Colorado · 0.1 M N of Oxford RD (26) · Structure no. BC-31-8.6-LT1
- Built
- 1992
- 33 years old
- Condition
- Good
- inspected February 2025
- Type
- Box Beam or Girders - Single or Spread
- Prestressed Concrete
- Length
- 56 ft
- 1 main span
- Daily traffic
- 182
- 2022 count
- Owner
- County
- County Highway Agency
About this bridge
N 81st ST (cr 31) over Left Hand Creek is a prestressed concrete box beam or girders - single or spread carrying N 81st ST (cr 31) over Left Hand Creek in Boulder County, Colorado. It was built in 1992, so it is 33 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 182 vehicles a day, roughly 23% of them trucks, projected to reach 218 by 2042. The structure is 56 ft (17.1 m) long and 34 ft wide. If it were closed, the detour would be 1.9 mi (3 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 | 8 Very Good | No problems noted. |
| Superstructure | 8 Very Good | No problems noted. |
| 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 81st ST (cr 31) over Left Hand Creek built?
It was built in 1992, making it 33 years old in 2025.
What condition is N 81st ST (cr 31) over Left Hand 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 81st ST (cr 31) over Left Hand Creek carry?
About 182 vehicles per day (2022 count), of which roughly 23% are trucks.
How long is N 81st ST (cr 31) over Left Hand Creek?
The structure is 56 ft (17.1 m) long with a longest span of 50 ft (15.2 m) and a deck 34 ft wide.
Who owns N 81st ST (cr 31) over Left Hand Creek?
It is owned by the County Highway Agency.