County Road 59 over South Platte River
FairWashington County, Colorado · 0.6 Mi. E. of Co. Rd. Q · Structure no. WTN59-Q.60-A
- Built
- 1989
- 36 years old
- Condition
- Fair
- inspected October 2023
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 523 ft
- 8 main spans
- Daily traffic
- 57
- 2023 count
- Owner
- County
- County Highway Agency
About this bridge
County Road 59 over South Platte River is a steel stringer/multi-beam or girder carrying County Road 59 over South Platte River in Washington County, Colorado. It was built in 1989, so it is 36 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 57 vehicles a day, roughly 45% of them trucks, projected to reach 71 by 2042. The structure is 523 ft (159.3 m) long and 28 ft wide. If it were closed, the detour would be 8.1 mi (13 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was County Road 59 over South Platte River built?
It was built in 1989, making it 36 years old in 2025.
What condition is County Road 59 over South Platte River 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 October 2023.
How much traffic does County Road 59 over South Platte River carry?
About 57 vehicles per day (2023 count), of which roughly 45% are trucks.
How long is County Road 59 over South Platte River?
The structure is 523 ft (159.3 m) long with a longest span of 65 ft (19.7 m) and a deck 28 ft wide.
Who owns County Road 59 over South Platte River?
It is owned by the County Highway Agency.