Bridge conditions in Lake County, Oregon
95 inventoried bridges · 7 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
7 of the 95 bridges the federal inventory lists in Lake County are rated poor; the rest split 39 good and 49 fair.
- 7 of the 95 bridges in Lake County, Oregon, are rated in poor condition (7.4%) in the 2025 National Bridge Inventory, as of .
- 39 bridges (41.1%) are rated good and 49 (51.6%) fair.
- The median Lake County bridge was built in 1981.
- The busiest poor-rated bridge is Or 140 (hwy 431) over Deep Creek (built 1966), carrying about 308 vehicles a day.
Good 41.1% · Fair 51.6% · Poor 7.4% of 95 bridges
Bridges rated poor
Every bridge in the county with a poor rating, busiest first. Poor means a major component is rated 4 or lower on FHWA's 0-9 scale; it is a repair flag, not a closure notice.
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Or 140 (hwy 431) over Deep Creek | 1966 | 308 | Poor |
| Road over Sycan Spring | 1961 | 85 | Poor |
| River Road over Elder Creek | 1957 | 79 | Poor |
| Road over Dairy Creek | 1949 | 50 | Poor |
| Road over North Fork Sprague River | 1957 | 50 | Poor |
| Road over Sycan River | 1960 | 50 | Poor |
| Road over Long Creek | 1966 | 18 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Or 140 (hwy 020) over Goose Lake Swale | 2001 | 2,107 | Good |
| Or 140 (hwy 020)RW over Irrigation Canal | 2001 | 2,107 | Good |
| Or 140 (hwy 020) over Thomas Creek | 2001 | 2,107 | Good |
| Or 140 (hwy 020) over Thomas Creek | 2001 | 2,107 | Good |
| Or 140 (hwy 020) over Warner Canyon Creek | 2001 | 2,107 | Good |
| Or 140 (hwy 020) over Muddy Creek | 2004 | 1,314 | Good |
| Or 140 (hwy 020)SB over Cottonwood Creek | 2004 | 1,314 | Good |
| US 395 (hwy 019)SB over Cogswell Creek | 2020 | 796 | Good |
| Or 31 (hwy 019) over Chewaucan River Gravel | 1965 | 738 | Fair |
| US 395 (hwy 019) over Crooked Creek | 1966 | 738 | Good |
Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.
All of Oregon: Oregon bridge conditions by county · every download on the data page.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.