County Road 84S over South St. Vrain Creek
FairBoulder County, Colorado · 0.1 Miles South of State · Structure no. BC-84S-0.1-SSV1
- Built
- 1990
- 35 years old
- Condition
- Fair
- inspected January 2025
- Type
- Box Beam or Girders - Single or Spread
- Prestressed Concrete
- Length
- 58 ft
- 1 main span
- Daily traffic
- 637
- 2023 count
- Owner
- County
- County Highway Agency
About this bridge
County Road 84S over South St. Vrain Creek is a prestressed concrete box beam or girders - single or spread carrying County Road 84S over South St. Vrain Creek in Boulder County, Colorado. It was built in 1990, so it is 35 years old, younger 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 637 vehicles a day, roughly 6% of them trucks, projected to reach 765 by 2043. The structure is 58 ft (17.7 m) long and 38 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 5 or 6. Minor deterioration is present but the structure is sound.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 8 Very Good | No problems noted. |
| Superstructure | 8 Very Good | No problems noted. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was County Road 84S over South St. Vrain Creek built?
It was built in 1990, making it 35 years old in 2025.
What condition is County Road 84S over South St. Vrain Creek 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 January 2025.
How much traffic does County Road 84S over South St. Vrain Creek carry?
About 637 vehicles per day (2023 count), of which roughly 6% are trucks.
How long is County Road 84S over South St. Vrain Creek?
The structure is 58 ft (17.7 m) long with a longest span of 52 ft (16 m) and a deck 38 ft wide.
Who owns County Road 84S over South St. Vrain Creek?
It is owned by the County Highway Agency.