Willow Park Drive over Sulphur Gulch | Sulphur
Douglas County, Colorado · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Willow Park Drive over Sulphur Gulch | Sulphur in Douglas County, Colorado, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the substructure, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1995, making it 30 years old at the 2025 inventory.
- It carries about 3,408 vehicles a day (traffic count year 2021).
- Its listed owner is a town or township highway agency.
- It is one of 119 of the 264 inventoried bridges in Douglas County rated fair (45.1%); 6 (2.3%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- Its class is unchanged from 2024 (fair), but component ratings moved: deck 7 to 6, superstructure 7 to 6, substructure 6 to 5.
- Its most recent inspection on record is dated February 2025, on a 24-month routine inspection cycle.
- A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.
View this bridge on a map → (39.51664, -104.7447)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 6 | Satisfactory condition |
| Superstructure | 7 | 6 | Satisfactory condition |
| Substructure | 6 | 5 | Fair condition |
Bridge details
| Structure | Concrete frame |
| Length | about 103 ft |
| Location | .1 Mi S of Main St |
| NBI structure number | PAR WILLOW-0.1 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | February 2025 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 8: foundations stable, scour above the top of the footing |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Colorado department of transportation.
Busiest bridges in Douglas County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I 25 Ml over Happy Canyon Creek | 1999 | 116,000 | Fair |
| I 25 Ml over Ridgegate Pkwy | 2008 | 116,000 | Fair |
| I 25 Ml over Clydesdale Ln | 1999 | 116,000 | Fair |
| SH 470 Ml over Willow Creek | 1984 | 95,000 | Fair |
| I 25 Nbnd Ramp over Ramp to County Line Rd R | 1983 | 85,500 | Fair |
| C470 EB Ramp to 25 over Lrt | 2005 | 85,500 | Fair |
All bridges nearby: Douglas County, CO bridge conditions · every bridge in Douglas County · Colorado bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.