Forest Road 305 over M Thompson CR
Pitkin County, Colorado · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Forest Road 305 over M Thompson CR in Pitkin 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 1956, making it 69 years old at the 2025 inventory.
- It carries about 10 vehicles a day (traffic count year 1994).
- It is one of 42 of the 65 inventoried bridges in Pitkin County rated fair (64.6%); 0 (0.0%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- It was rated poor in the 2024 inventory and is now fair (substructure 2 to 6).
- Its most recent inspection on record is dated August 2024, on a 12-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 → (39.29998, -107.27778)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 2 | 6 | Satisfactory condition |
Bridge details
| Structure | Timber stringer or multi-beam girder |
| Length | about 23 ft |
| Location | 7.8 Mi SW of Carbondale |
| NBI structure number | 021503000001031 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | August 2024 |
| Inspection interval (item 91) | 12 months |
| Scour (item 113) | 4: foundations stable, field review says exposed foundations need protection |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Colorado department of transportation.
Busiest bridges in Pitkin County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| SH 82 Ml over Co Rd Castle Creek | 1961 | 25,000 | Fair |
| SH 82 Ml Ebnd over Draw | 2005 | 22,000 | Good |
| SH 82 ML-S/E Bound over Draw | 2004 | 22,000 | Good |
| SH 82 Ml Ebnd over Draw | 2003 | 22,000 | Good |
| SH 82 Ml over Stage Road | 1994 | 22,000 | Good |
| SH 82 Ml over Maroon Creek | 2005 | 22,000 | Fair |
All bridges nearby: Pitkin County, CO bridge conditions · every bridge in Pitkin County · Colorado bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.