Irr# US 491 Ml over Indian Creek
Montezuma County, Colorado · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Irr# US 491 Ml over Indian Creek in Montezuma 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 1959, making it 66 years old at the 2025 inventory.
- It carries about 4,000 vehicles a day (traffic count year 2018).
- Its listed owner is the state highway agency.
- It is one of 41 of the 60 inventoried bridges in Montezuma County rated fair (68.3%); 5 (8.3%) 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: substructure 7 to 6, deck 6 to 7, superstructure 7 to 8.
- Its most recent inspection on record is dated February 2025, on a 24-month routine inspection cycle.
- It is coded scour critical (NBI item 113 = 3): scour critical: foundations unstable for the assessed or calculated scour.
- 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 → (37.00712, -108.74825)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 7 | Good condition |
| Superstructure | 7 | 8 | Very good condition |
| Substructure | 7 | 6 | Satisfactory condition |
Bridge details
| Structure | Concrete tee beam |
| Length | about 93 ft |
| Location | 0.6 Mi N of New Mexico |
| NBI structure number | P-02-B |
| 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) | 3: scour critical: foundations unstable for the assessed or calculated scour |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Colorado department of transportation.
Busiest bridges in Montezuma County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Irr# US 160 Ml over Mc Elmo Creek | 1958 | 9,400 | Fair |
| US 160 Ml over Mc Elmo Creek | 1969 | 6,700 | Fair |
| US 160 Ml over Mancos River | 1958 | 6,000 | Fair |
| SH 145 Ml over Dolores River | 1972 | 4,300 | Fair |
| Irr# US 491 Ml over Mancos River | 1959 | 4,000 | Fair |
| Irr# US 491 Ml over Chimney Rock Draw | 1957 | 4,000 | Fair |
All bridges nearby: Montezuma County, CO bridge conditions · every bridge in Montezuma County · Colorado bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.