Total bridges
7
Public highway bridges in Island County
County profile · official public datasets
Island County, WA
7 public highway bridges tracked in the FHWA National Bridge Inventory: 42.9% rated Good, 57.1% Fair, 0% Poor.
- 7
- Public bridges
- 42.9%
- Good condition
- 0%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Island County posts a top-5% lowest Poor-condition share among rated counties in the state across rated county bridge inventory.
- Top 5%
- lowest Poor share in state
- 0%
- Poor-condition share
- 7
- public highway bridges
- 1978
- avg year built
Poor is an FHWA condition category from the lowest applicable component rating (4 or below), not a live crossing-safety or closure decision. Rankings cover counties with at least five public highway bridges.
Island County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Island County ranks #2 of 39 Washington counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 0%). Island County, Washington contains 7 public highway bridges. Roughly 42.9% are rated “Good,” 57.1% “Fair,” and 0% “Poor.” Poor means the lowest applicable deck, superstructure, substructure, or culvert rating is 4 or below on the 0–9 NBI scale. It is a condition category, not a live safety or closure decision.
Responsible agencies inspect covered bridges on risk-based intervals under current NBIS rules and submit inventory data to FHWA annually. The list below shows every NBI-tracked bridge in the county. Use the “Sort by” controls to change the ordering, and click any row for its reported inspection date, traffic count, and condition fields.
Source: FHWA National Bridge Inventory. See methodology for full definitions.
Good condition
42.9%
3 of 7 rated 7-9
Fair condition
57.1%
4 of 7 rated 5-6
Poor condition
0%
0 of 7 rated 4 or below
In-state Poor-share rank
#2 of 39
Among Washington counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 7 NBI-tracked bridges by lowest applicable component rating.
Good 42.9% (3)
Fair 57.1% (4)
Poor 0% (0)
28.6% of Island County's bridges have passed the 50-year mark
2 of the 7 bridges with a recorded construction year were built in 1974 or earlier. Age alone is not a defect: a well-maintained older bridge can rate Good, and 42.9% of this county's inventory does. Even so, this older cohort is the population from which future Poor ratings are drawn, which is why the age profile below matters alongside the condition split above.
Cutoff derives from the 2024 release year minus a 50-year design life. Source: FHWA National Bridge Inventory, 2024 release.
When Island County's bridges were built
7 bridges with a recorded construction year, grouped by decade
- 1930s
1930–1939
2 bridges
- 1970s 1
1970–1979
1 bridges
- 1980s 1
1980–1989
1 bridges
- 2000s
2000–2009
3 bridges
What this shows Construction peaked in the 2000s, when 3 of the county's bridges still in the inventory were built, which is 42.9% of those with a recorded year. That cohort is now 15 to 24 years old in the 2024 inventory. Its average build year (1978) matches the Washington average (1975).
How Island County compares with Washington's closest counties by inventory size
The 5 Washington counties nearest Island County in number of bridges, with their condition splits. Its 0% Poor share is the 2nd-lowest of these 6. Its average build year of 1978 against a peer-group mean of 1972 is 6 years newer.
Showing the 5 closest of 38 Washington counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Ferry County | 53 | 41.5% | 49.1% | 9.4% | 1972 |
| Douglas County | 40 | 40% | 47.5% | 12.5% | 1965 |
| Wahkiakum County | 36 | 50% | 47.2% | 2.8% | 1969 |
| Asotin County | 29 | 51.7% | 41.4% | 6.9% | 1976 |
| San Juan County | 13 | 23.1% | 76.9% | 0% | 1979 |
| Island County (this page) | 7 | 42.9% | 57.1% | 0% | 1978 |
Each share is of that county's own total tracked bridges; peers are the counties with 5 or more bridges whose inventory size is closest to Island County's. Source: FHWA National Bridge Inventory, 2024 release.
All bridges (7)
SR 20
FairOver: DECEPTION PASS
25.4 E JCT SR 525, Island, WA
Built 1935 Load: 12.0 t ADT: 18,339
SR 20 EXTENSION
FairOver: KEYSTONE HARBOR
3.4 W JCT SR 525, Island, WA
Built 1979 Load: 16.3 t ADT: 1,863
SR 525
FairOver: POSSESSION SOUND
1.9 N JCT SR 526, Island, WA
Built 1987 Load: 22.7 t ADT: 12,000
E. PIONEER WAY
FairOver: DRAINAGE BASIN
EAST OF OAK HARBOR, Island, WA
Built 2006 Load: 32.9 t ADT: 30
SR 20
GoodOver: STATE PARK ROAD/TRAIL
25.2 E JCT SR 525, Island, WA
Built 1935 Load: 24.5 t ADT: 18,339
SR 525
GoodOver: POSSESSION SOUND
1.9 N JCT SR 526, Island, WA
Built 2000 Load: 31.7 t ADT: 13,078
SR 525
GoodOver: POSSESSION SOUND
1.9 N JCT SR 526, Island, WA
Built 2003 Load: 37.2 t ADT: 1,078
Read our methodology - how this data is sourced, computed, and verified.
Related
Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainBridges
Every figure on PlainBridges is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. NBI condition categories reflect the latest reported inventory record, not a live safety, closure, or travel decision.