SH 128 (120TH Ave) over US 36 Ml
Broomfield County, Colorado · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- SH 128 (120TH Ave) over US 36 Ml in Broomfield County, Colorado, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the substructure, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 2011, making it 14 years old at the 2025 inventory.
- It carries about 19,000 vehicles a day (traffic count year 2020).
- Its listed owner is the state highway agency.
- It is one of 29 of the 60 inventoried bridges in Broomfield County rated fair (48.3%); 1 (1.7%) are rated poor.
- 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 → (39.91119, -105.08884)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 7 | Good condition |
| Superstructure | 7 | Good condition |
| Substructure | 6 | Satisfactory condition |
Bridge details
| Structure | Continuous prestressed concrete stringer or multi-beam girder |
| Length | about 299 ft |
| Location | 120TH Ave and US 36 |
| NBI structure number | E-16-XU |
| Condition class | Fair |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Colorado department of transportation.
Busiest bridges in Broomfield 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 |
All bridges nearby: Broomfield County, CO bridge conditions · every bridge in Broomfield County · Colorado bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.