Total bridges
25
Public highway bridges in Kodiak Island County
County profile · official public datasets
Kodiak Island County, AK
25 public highway bridges tracked in the FHWA National Bridge Inventory: 32% rated Good, 60% Fair, 8% Poor.
- 25
- Public bridges
- 32%
- Good condition
- 8%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Kodiak Island County pairs a higher-than-median Poor-condition share among rated counties in the state with an older average build year than the state inventory.
- 19th
- of 27 on Poor share
- 8%
- Poor-condition share
- 25
- public highway bridges
- 1981
- 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.
Kodiak Island County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Kodiak Island County ranks #19 of 27 Alaska counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 8%). Kodiak Island County, Alaska contains 25 public highway bridges. Roughly 32% are rated “Good,” 60% “Fair,” and 8% “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
32%
8 of 25 rated 7-9
Fair condition
60%
15 of 25 rated 5-6
Poor condition
8%
2 of 25 rated 4 or below
In-state Poor-share rank
#19 of 27
Among Alaska counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 25 NBI-tracked bridges by lowest applicable component rating.
Good 32% (8)
Fair 60% (15)
Poor 8% (2)
Kodiak Island County's Poor-condition bridges carry 4,560 vehicle crossings a day
That is 24.6% of the county's reported daily bridge traffic on 8% of its bridges: Poor-condition structures carry more traffic than their share of the inventory. Each Poor bridge averages 2,280 crossings a day against 1,037 for a Good-condition one. A Poor rating is a condition category, not a closure or a live safety judgement; it means the lowest applicable component rating is 4 or below.
Computed over the 25 of 25 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
56% of Kodiak Island County's bridges have passed the 50-year mark
14 of the 25 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 32% 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.
One structure carries 61.2% of the county's Poor-condition bridge traffic
REZANOF DRIVE over SARGENT CREEK, built 1980, carries 2,790 vehicles a day, the most of any Poor-rated structure here. The county's Poor-condition exposure is concentrated rather than evenly spread, so the 2-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 4,560 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Kodiak Island County's bridges were built
25 bridges with a recorded construction year, grouped by decade
- 1960s 1
1960–1969
1 bridges
- 1970s
1970–1979
14 bridges
- 1980s
1980–1989
6 bridges
- 1990s 1
1990–1999
1 bridges
- 2010s 3
2010–2019
3 bridges
What this shows Construction peaked in the 1970s, when 14 of the county's bridges still in the inventory were built, which is 56% of those with a recorded year. That cohort is now 45 to 54 years old in the 2024 inventory. Its average build year is 1981, 8 years older than the Alaska average of 1989.
How Kodiak Island County compares with Alaska's closest counties by inventory size
The 5 Alaska counties nearest Kodiak Island County in number of bridges, with their condition splits. Its 8% Poor share is the 6th-lowest of these 6. Its average build year of 1981 against a peer-group mean of 1989 is 8 years older.
Showing the 5 closest of 26 Alaska counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Nome County | 30 | 30% | 63.3% | 6.7% | 1977 |
| Denali County | 27 | 18.5% | 77.8% | 3.7% | 1976 |
| Kodiak Island County (this page) | 25 | 32% | 60% | 8% | 1981 |
| Haines County | 20 | 45% | 50% | 5% | 1994 |
| Aleutians East County | 16 | 31.3% | 62.5% | 6.3% | 2000 |
| North Slope County | 16 | 62.5% | 31.3% | 6.3% | 1996 |
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 Kodiak Island County's. Source: FHWA National Bridge Inventory, 2024 release.
Nationwide counties with similar inventory size or average build year
Two NBI-derived peer sets for Kodiak Island County, both outside Alaska so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside AK (25 bridges here).
- Schley County, GA · 25 bridges
- Lane County, KS · 25 bridges
- Benzie County, MI · 25 bridges
- Otsego County, MI · 25 bridges
Similar average build year
Nearest mean year-built outside AK (1981 here).
- Franklin County, OH · avg 1981 · 922 bridges
- Greenville County, SC · avg 1981 · 635 bridges
- Montgomery County, OH · avg 1981 · 632 bridges
- McLean County, IL · avg 1981 · 624 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
Good-condition bridges (8)
NEAR ISLAND ROAD
GoodOver: KODIAK HARBOR CHANNEL
MILE POINT 0.1, Kodiak Island, AK
Built 1986 Load: 27.3 t ADT: 1,970
ANTON LARSEN BAY
GoodOver: BUSKIN RIVER NO 6
MILE POINT 0.6, Kodiak Island, AK
Built 1980 Load: 28.2 t ADT: 380
IRR:MARINE HWY RTE
GoodOver: OLD HARBOR CITY DOCK
OLD HARBOR, Kodiak Island, AK
Built 2011 Load: 31.3 t ADT: 100
MARINE HWY ROUTE
GoodOver: KODIAK CITY DOCK
KODIAK, Kodiak Island, AK
Built 2016 Load: 32.7 t ADT: 216
REZANOF DRIVE
GoodOver: BUSKIN RIVER NO 5
MILE POINT 8.6, Kodiak Island, AK
Built 1995 Load: 37.2 t ADT: 5,150
CHINIAK HIGHWAY
GoodOver: UNNAMED CREEK SITE 5
MILE POINT 21.8, Kodiak Island, AK
Built 2019 Load: 41.5 t ADT: 210
CHINIAK HIGHWAY
GoodOver: WEST FORK TWIN CREEK
MILE POINT 28.5, Kodiak Island, AK
Built 1975 Load: 47.0 t ADT: 166
MARINE HWY ROUTE
GoodOver: KODIAK PIER 2
NEAR USCG BASE, Kodiak Island, AK
Built 1988 Load: 75.5 t ADT: 100
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.