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Infrastructure Grade
Infrastructure Report Card
5.6% of bridges in poor condition
Total Bridges
8,520
Poor Condition
473(5.6%)
Avg Bridge Age
51 yrs
Trend
Declining
| Metric | Washington | National Avg | Trend |
|---|---|---|---|
| % Poor Condition | 5.6% | 6.7% | Declining |
| vs. National Average | -1.1 pts | -- | -- |
| Average Bridge Age | 51 yrs | 48 yrs | -- |
| Good or Better | 5,274(61.9%) | -- | -- |
Grade Scale
Percentage of bridges in poor condition over time. The dashed line shows the national average for comparison.
Total Bridges
8,520
Poor Condition
473(5.6%)
Average Age
51 yrs
Daily Crossings
68.7M
Good or Better
5,274(61.9%)
These bridges have at least one major component rated "5" (Fair) — one step above the poor threshold. Sorted by daily traffic to highlight highest-impact structures at risk.
| Bridge | Location | Deck | Super | Sub | Daily Traffic |
|---|---|---|---|---|---|
| N QUEEN ANNE DR | King County | 6 | 5 | 7 | 125,000 |
| I-5 | King County | 6 | 6 | 5 | 104,978 |
| I-5 | King County | 7 | 5 | 7 | 95,981 |
| I-5 | Snohomish County | 5 | 6 | 7 | 84,075 |
| I-5 | Snohomish County | 6 | 5 | 7 | 78,048 |
| I-5 | King County | 6 | 5 | 7 | 70,133 |
| EB I-90 | King County | 7 | 5 | 7 | 68,544 |
| I-5 | Snohomish County | 7 | 5 | 7 | 68,535 |
| I-5 | Clark County | 6 | 5 | 6 | 65,013 |
| I-5 | Clark County | 6 | 5 | 6 | 65,013 |
| I-405 | King County | 5 | 7 | 7 | 64,434 |
| I-5 | Thurston County | 6 | 5 | 7 | 62,815 |
| SR 167 | King County | 7 | 5 | 7 | 61,426 |
| SR 167 | King County | 7 | 5 | 7 | 61,426 |
| SR 99 | King County | 6 | 5 | 6 | 61,259 |
The 10 bridges in poorest condition, ranked by lowest sufficiency rating.
over SURFSIDE EST. LAGOON
over MISSION CREEK
over PUYALLUP WATERWAY RR
over STATE ROUTE 522
over EDGEWATER CREEK
over WIDE HOLLOW CREEK
over PUYALLUP RIVER
over CHEHALIS RIVER
over Mill Creek
over MARION DRAIN
States with similar infrastructure profiles, ranked by percentage of bridges in poor condition.
Grading: Grades are based on the percentage of bridges classified as "poor condition." A bridge is in poor condition when at least one major component (deck, superstructure, or substructure) is rated 4 or below on the NBI 0-9 scale.
Data Source: Federal Highway Administration (FHWA) National Bridge Inventory (NBI). Data is updated annually. BridgeStats is not affiliated with or endorsed by the FHWA.
Watchlist Criteria: Bridges with any component rated "5" (Fair) are one step from the poor threshold of 4 and are flagged for monitoring. These bridges are not yet in poor condition but may deteriorate without maintenance.