Lake County Bridge Report Card
Lake County scores 73 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Lake County, Oregon
Lake County has 95 bridges in the National Bridge Inventory, with 7 rated poor and 5 rated scour-critical. Its poor-condition share of 7.4% is above the 5.1% statewide average. Poor-condition bridges carry about 640 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Lake County a Bridge Condition Exposure Score of 73/100 (C). The county has 95 bridges in the National Bridge Inventory, including 7 in poor condition and 5 rated scour-critical. Poor-condition bridges carry about 640 daily vehicle crossings. Poor condition does not mean unsafe; bridges judged unsafe are closed or restricted by transportation agencies.
How the Score Breaks Down
| Factor | Weight | County Value | Penalty |
|---|---|---|---|
| Poor-condition bridge share | 40 | 7.4% | 14.7 |
| Poor-condition traffic exposure | 25 | 2.0% of measured traffic | 1.5 |
| Scour-critical bridge share | 20 | 5.3% | 10.5 |
| Average age vs national baseline | 10 | 45 years vs 48 nationally | 0.0 |
| Traffic-data completeness | 5 | 32,149 measured daily crossings | 0.0 |
Score = 100 minus weighted penalties. The score is a comparative research signal, not an official safety rating. Read the full methodology.
County Comparisons
| County Poor-Condition Share | 7.4% |
| State Poor-Condition Share | 5.1% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 5.3% |
| Average Bridge Age | 45 years |
| Poor-Condition Traffic Exposure | 640 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Lake County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| Or 140 (hwy 431) over Deep Creek | Poor condition + traffic exposure | Poor | 308 | 1966 |
| Road over Sycan Spring | Poor condition + traffic exposure | Poor | 85 | 1961 |
| River Road over Elder Creek | Poor condition + traffic exposure | Poor | 79 | 1957 |
| Road over Dairy Creek | Poor condition + traffic exposure | Poor | 50 | 1949 |
| Road over North Fork Sprague River | Poor condition + traffic exposure | Poor | 50 | 1957 |
| Road over Sycan River | Poor condition + traffic exposure | Poor | 50 | 1960 |
| Road over Long Creek | Poor condition + traffic exposure | Poor | 18 | 1966 |
| Or 31 (hwy 019) over Chewaucan River Gravel | Scour-critical foundation rating | Fair | 738 | 1965 |
| Or 31 (hwy 019) over Chewaucan River Paisley | Scour-critical foundation rating | Fair | 625 | 1966 |
| 3-16 over Camas Creek | Scour-critical foundation rating | Fair | 44 | 1989 |
Important safety note
Poor condition does not mean a bridge is unsafe. It means at least one major component has significant deterioration and the bridge is a priority for maintenance, repair, or replacement. Bridges judged unsafe are closed or restricted by transportation agencies.