County Road 18 over Mallon Ditch
Jackson County, Colorado · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- County Road 18 over Mallon Ditch in Jackson County, Colorado, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the superstructure, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1986, making it 39 years old at the 2025 inventory.
- It carries about 146 vehicles a day (traffic count year 2023).
- Its listed owner is the county highway agency.
- It is one of 32 of the 47 inventoried bridges in Jackson County rated fair (68.1%); 2 (4.3%) 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 → (40.69442, -106.44163)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Superstructure | 6 | Satisfactory condition |
| Substructure | 8 | Very good condition |
Bridge details
| Structure | Steel through arch |
| Length | about 23 ft |
| Location | 3.3 Mi W of Co Rd 12W |
| NBI structure number | 57001803.30028 |
| Condition class | Fair |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Colorado department of transportation.
Busiest bridges in Jackson County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| SH 125 Ml over Michigan River | 2012 | 2,400 | Good |
| SH 125 Ml over Illinois River | 1993 | 2,200 | Good |
| SH 14 Ml over Grizzly Creek | 1949 | 1,300 | Fair |
| SH 14 Ml over Grizzly Creek | 1950 | 1,300 | Fair |
| SH 14 Ml over Colorado Creek | 1949 | 1,300 | Fair |
| SH 14 Ml over Arapahoe Creek | 1950 | 1,300 | Fair |
All bridges nearby: Jackson County, CO bridge conditions · every bridge in Jackson County · Colorado bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.