No. 30th Street over Four Mile Creek
PoorBoulder County, Colorado · 300 Ft N of Palo Parkway · Structure no. BC-30TH-0.5-FMC
- Built
- 1973
- 52 years old
- Condition
- Poor
- inspected January 2025
- Type
- Tee Beam
- Prestressed Concrete
- Length
- 72 ft
- 2 main spans
- Daily traffic
- 1,424
- 2023 count
- Owner
- County
- County Highway Agency
About this bridge
No. 30th Street over Four Mile Creek is a prestressed concrete tee beam carrying No. 30th Street over Four Mile Creek in Boulder County, Colorado. It was built in 1973, so it is 52 years old, older than the Colorado average of 42.2 years.
The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
It carries about 1,424 vehicles a day, roughly 5% of them trucks, projected to reach 1,709 by 2043. The structure is 72 ft (21.9 m) long and 54 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 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 9 Excellent | No problems noted. |
| Superstructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Substructure | 8 Very Good | No problems noted. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was No. 30th Street over Four Mile Creek built?
It was built in 1973, making it 52 years old in 2025.
What condition is No. 30th Street over Four Mile Creek in?
The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in January 2025.
How much traffic does No. 30th Street over Four Mile Creek carry?
About 1,424 vehicles per day (2023 count), of which roughly 5% are trucks.
How long is No. 30th Street over Four Mile Creek?
The structure is 72 ft (21.9 m) long with a longest span of 33 ft (10.1 m) and a deck 54 ft wide.
Who owns No. 30th Street over Four Mile Creek?
It is owned by the County Highway Agency.