Total bridges
103
Public highway bridges in Kenai Peninsula County
County profile · official public datasets
Kenai Peninsula County, AK
103 public highway bridges tracked in the FHWA National Bridge Inventory: 35.9% rated Good, 50.5% Fair, 13.6% Poor.
- 103
- Public bridges
- 35.9%
- Good condition
- 13.6%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Kenai Peninsula County posts a higher-than-median Poor-condition share among rated counties in the state across mid-size county bridge inventory.
- 25th
- of 27 on Poor share
- 13.6%
- Poor-condition share
- 103
- public highway bridges
- 1988
- 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.
Kenai Peninsula County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Kenai Peninsula County ranks #25 of 27 Alaska counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 13.6%). Kenai Peninsula County, Alaska contains 103 public highway bridges. Roughly 35.9% are rated “Good,” 50.5% “Fair,” and 13.6% “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
35.9%
37 of 103 rated 7-9
Fair condition
50.5%
52 of 103 rated 5-6
Poor condition
13.6%
14 of 103 rated 4 or below
In-state Poor-share rank
#25 of 27
Among Alaska counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 103 NBI-tracked bridges by lowest applicable component rating.
Good 35.9% (37)
Fair 50.5% (52)
Poor 13.6% (14)
Kenai Peninsula County's Poor-condition bridges carry 6,297 vehicle crossings a day
That is 3.4% of the county's reported daily bridge traffic on 13.6% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 450 crossings a day against 2,731 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 103 of 103 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
28.2% of Kenai Peninsula County's bridges have passed the 50-year mark
29 of the 103 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 35.9% 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.
One structure carries 55.4% of the county's Poor-condition bridge traffic
STERLING HIGHWAY over SOUTH FORK ANCHOR RIVER, built 1959, carries 3,490 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 14-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 6,297 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Kenai Peninsula County's bridges were built
103 bridges with a recorded construction year, grouped by decade
- 1930s 1
1930–1939
1 bridges
- 1950s 7
1950–1959
7 bridges
- 1960s
1960–1969
16 bridges
- 1970s
1970–1979
12 bridges
- 1980s
1980–1989
14 bridges
- 1990s
1990–1999
23 bridges
- 2000s
2000–2009
18 bridges
- 2010s 7
2010–2019
7 bridges
- 2020s 5
2020–2029
5 bridges
What this shows Construction peaked in the 1990s, when 23 of the county's bridges still in the inventory were built, which is 22.3% of those with a recorded year. That cohort is now 25 to 34 years old in the 2024 inventory. Its average build year (1988) matches the Alaska average (1989).
How Kenai Peninsula County compares with Alaska's closest counties by inventory size
The 5 Alaska counties nearest Kenai Peninsula County in number of bridges, with their condition splits. Its 13.6% Poor share is the 5th-lowest of these 6. Its average build year of 1988 against a peer-group mean of 1989 is in line with the group.
Showing the 5 closest of 26 Alaska counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Hoonah-Angoon County | 125 | 49.6% | 35.2% | 15.2% | 1994 |
| Matanuska-Susitna County | 120 | 50.8% | 43.3% | 5.8% | 1993 |
| Fairbanks North Star County | 111 | 50.5% | 42.3% | 7.2% | 1988 |
| Kenai Peninsula County (this page) | 103 | 35.9% | 50.5% | 13.6% | 1988 |
| Ketchikan Gateway County | 100 | 43% | 45% | 12% | 1993 |
| Yukon-Koyukuk County | 94 | 41.5% | 50% | 8.5% | 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 Kenai Peninsula 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 Kenai Peninsula County, both outside Alaska so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside AK (103 bridges here).
- Dallas County, AR · 103 bridges
- Morgan County, GA · 103 bridges
- Rawlins County, KS · 103 bridges
- Lawrence County, KY · 103 bridges
Similar average build year
Nearest mean year-built outside AK (1988 here).
- Travis County, TX · avg 1988 · 1,544 bridges
- Grant County, OK · avg 1988 · 476 bridges
- Loudoun County, VA · avg 1988 · 442 bridges
- Licking County, OH · avg 1988 · 439 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
Poor-condition bridges (14)
IRR BIA RTE 1026
PoorOver: UNNAMED CREEK
0.5 MI. N OF WINDY BAY RD, Kenai Peninsula, AK
Built 1997 Load: 0.0 t ADT: 10
IRR BIA RTE 1026
PoorOver: UNNAMED CREED
0.8 MI N OF WINDY BAY RD., Kenai Peninsula, AK
Built 1997 Load: 0.0 t ADT: 10
IRR BIA RTE 8PGH
PoorOver: UNNAMED CREEK
14.5 Mi SE of Port Graham, Kenai Peninsula, AK
Built 1997 Load: 0.0 t ADT: 5
IRR BIA RTE 8PGH
PoorOver: UNNAMED CREEK
15.4 Mi SE of Port Graha, Kenai Peninsula, AK
Built 1997 Load: 0.0 t ADT: 5
NO DATA ENTERED
PoorOver: PALMER CREEK
PALMER CREEK ROAD, Kenai Peninsula, AK
Built 1957 Load: 2.7 t ADT: 10
IRR BIA RTE 8PGH
PoorOver: UNNAMED CREEK
14.2 Mi SE of Port Graham, Kenai Peninsula, AK
Built 1997 Load: 3.6 t ADT: 5
IRR BIA RTE 1048
PoorOver: WINDY CREEK RIGHT
16.6 Mi SE of Port Graham, Kenai Peninsula, AK
Built 1997 Load: 7.3 t ADT: 2
QUARTZ CREEK ROAD
PoorOver: QUARTZ CREEK
MILE POINT 0.7, Kenai Peninsula, AK
Built 1958 Load: 15.4 t ADT: 210
STERLING HIGHWAY
PoorOver: SOUTH FORK ANCHOR RIVER
MILE POINT 120.7, Kenai Peninsula, AK
Built 1959 Load: 21.5 t ADT: 3,490
IRR BIA RTE 8PGH
PoorOver: UNNAMED CREEK
9.5 MI SE OF PORT GRAHAM, Kenai Peninsula, AK
Built 1997 Load: 22.7 t ADT: 10
FUNNY RIVER ROAD
PoorOver: FUNNY RIVER
MILE POINT 11.1, Kenai Peninsula, AK
Built 1969 Load: 24.9 t ADT: 1,830
NAUTICAL AVENUE
PoorOver: SALMON CREEK TRIBUTARY
MILE POINT 0.1, Kenai Peninsula, AK
Built 1970 Load: 24.9 t ADT: 100
IRR:JAKOLOF BAY RD
PoorOver: BARABARA CREEK
MILE POINT 4.4, Kenai Peninsula, AK
Built 1968 Load: 25.9 t ADT: 110
FOURTH AVENUE
PoorOver: SEWARD LAGOON
MILE POINT 0.5, Kenai Peninsula, AK
Built 1960 Load: 32.7 t ADT: 500
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.