County Road 1813 over Blue River
Summit County, Colorado · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- County Road 1813 over Blue River in Summit County, Colorado, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 4 (poor condition) on the 0-9 scale.
- It was built in 1938, making it 87 years old at the 2025 inventory.
- It carries about 10 vehicles a day (traffic count year 2015).
- It is one of 5 of the 63 inventoried bridges in Summit County rated poor (7.9%); 5 (7.9%) are rated poor.
- A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.
View this bridge on a map → (39.88018, -106.33414)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 4 | Poor condition |
| Superstructure | 6 | Satisfactory condition |
| Substructure | 6 | Satisfactory condition |
Bridge details
| Structure | Steel deck arch |
| Length | about 173 ft |
| Location | 26 mi NW of Silverthorne |
| NBI structure number | ECA-BT-002 |
| Condition class | Poor |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Colorado department of transportation.
Busiest bridges in Summit County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I 70 Wbnd over Forest Service Road | 2021 | 36,000 | Good |
| I 70 Ebnd over Forest Service Road | 2021 | 36,000 | Good |
| I 70 Ml over County Road | 1977 | 27,000 | Good |
| SH 9 Ml over Tenmile Creek | 1980 | 24,000 | Fair |
| SH 9 Ml over I 70 Ml | 1971 | 24,000 | Fair |
| SH 9 Ml over Pedestrian Underpass | 2023 | 22,287 | Good |
All bridges nearby: Summit County, CO bridge conditions · every bridge in Summit County · Colorado bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.