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.

Total bridges

103

Public highway bridges in Kenai Peninsula County

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.

1930s

1
1950s

7
1960s

16
1970s

12
1980s

14
1990s

23
2000s

18
2010s

7
2020s

5

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.

Bridge inventory size and condition shares for Kenai Peninsula County and the 5 Alaska counties closest to it in inventory size
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.

All 103 Good 37 Fair 52 Poor 14

Fair-condition bridges (52)

Sort:

Kenai Peninsula County Bridge Snapshot

Condition distribution

Kenai Peninsula County's Poor-condition bridges carry 6,297 vehicle crossings a day

28.2% of Kenai Peninsula County's bridges have passed the 50-year mark

One structure carries 55.4% of the county's Poor-condition bridge traffic

How Kenai Peninsula County compares with Alaska's closest counties by inventory size

Nationwide counties with similar inventory size or average build year

Similar inventory size

Similar average build year

Fair-condition bridges (52)

IRR BIA RTE 1029

QUARTZ CREEK ROAD

RUNNING WATER AVE

WILLIAMSPORT/PILE

CHAKOK ROAD

DOROTHY DRIVE

TRAIL RIVER CG RD

IRR BIA RTE 1026

IRR BIA RTE 8PGH

IRR BIA RTE 8PGH

IRR BIA RTE 1026

IRR BIA RTE 1082

STERLING HIGHWAY

LEE ROY AVENUE

STERLING HIGHWAY

HOPE ROAD

WILLIAMSPORT/PILE

STERLING HIGHWAY

STERLING HIGHWAY

STERLING HIGHWAY

IRR:AIRPORT ROAD

STERLING HIGHWAY

KENAI RIV CROSSING

FOREST ROAD

BRUNO ROAD

TIMBER LANE DRIVE

IRR BIA RTE 8PGH

STERLING HIGHWAY

TALL TREES ROAD

SEWARD HIGHWAY

SEWARD HIGHWAY

KENAI SPUR

KENAI SPUR HWY EXT

KENAI SPUR HWY EXT

NORTH FORK ROAD

NASH ROAD

NASH ROAD

MARINE HWY ROUTE

SEWARD HIGHWAY

NASH ROAD

CEMETARY ROAD

SEWARD HIGHWAY

EXIT GLACIER ROAD

SEWARD HIGHWAY

SEWARD HIGHWAY

STERLING HIGHWAY

LOWELL POINT ROAD

NORTH FORK ROAD

EXIT GLACIER ROAD

MARINE HWY ROUTE

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