Bridge conditions in Broomfield County, Colorado
60 inventoried bridges · 1 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
The federal inventory lists 60 bridges in Broomfield County: 30 rated good, 29 fair, and 1 poor.
- 1 of the 60 bridges in Broomfield County, Colorado, are rated in poor condition (1.7%) in the 2025 National Bridge Inventory, as of .
- 30 bridges (50.0%) are rated good and 29 (48.3%) fair.
- The median Broomfield County bridge was built in 2002.
- The busiest poor-rated bridge is SH 121 Ml Sbnd over US 287 Ml RR Spur (built 1972), carrying about 25,000 vehicles a day.
Good 50.0% · Fair 48.3% · Poor 1.7% of 60 bridges
Bridges rated poor
Every bridge in the county with a poor rating, busiest first. Poor means a major component is rated 4 or lower on FHWA's 0-9 scale; it is a repair flag, not a closure notice.
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| SH 121 Ml Sbnd over US 287 Ml RR Spur | 1972 | 25,000 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 36 Ml over Ramp B & Bikepath | 2001 | 68,000 | Good |
| US 36 Ml over Rock Creek | 2015 | 68,000 | Good |
| US 36 Ml over Flat Iron Circle East | 1999 | 62,000 | Good |
| I 25 Ml Nbnd over County Road 6 | 2004 | 54,000 | Good |
| I25 Ml Sbnd over Weld County Road 6 | 2004 | 54,000 | Good |
| I 25 Ml Nbnd over Nwp | 2002 | 54,000 | Good |
| SB I-25 over NWP/E470 | 2003 | 54,000 | Good |
| SH 121 Ml over US 36 Ml | 2014 | 39,000 | Good |
| US 287 Ml over Flood Control Ditch | 1965 | 29,000 | Fair |
| Northwest Parkway over Rock Creek | 1999 | 27,763 | Fair |
Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.
All of Colorado: Colorado bridge conditions by county · every download on the data page.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.