County profile · official public datasets

Juneau City and County, AK

47 public highway bridges tracked in the FHWA National Bridge Inventory: 36.2% rated Good, 61.7% Fair, 2.1% Poor.

47
Public bridges: 36.2%
Good condition: 2.1%
Poor condition

The verdict

According to the Federal Highway Administration's 2024 National Bridge Inventory.

Juneau City and County pairs a top-quartile lowest Poor-condition share among rated counties in the state with an older average build year than the state inventory.

Top 15%
lowest Poor share in state: 2.1%
Poor-condition share: 47
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.

Juneau City and County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Juneau City and County ranks #4 of 27 Alaska counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 2.1%). Juneau City and County, Alaska contains 47 public highway bridges. Roughly 36.2% are rated “Good,” 61.7% “Fair,” and 2.1% “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

Public highway bridges in Juneau City and County

Good condition

36.2%

17 of 47 rated 7-9

Fair condition

61.7%

29 of 47 rated 5-6

Poor condition

2.1%

1 of 47 rated 4 or below

In-state Poor-share rank

#4 of 27

Among Alaska counties with 5+ bridges, lower share ranks better

Condition distribution

Share of 47 NBI-tracked bridges by lowest applicable component rating.

Good

36.2% (17)

Fair

61.7% (29)

Poor

2.1% (1)

Juneau City and County's Poor-condition bridges carry 200 vehicle crossings a day

That is 0.1% of the county's reported daily bridge traffic on 2.1% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 200 crossings a day against 5,634 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 47 of 47 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

42.6% of Juneau City and County's bridges have passed the 50-year mark

20 of the 47 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 36.2% 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 100% of the county's Poor-condition bridge traffic

AMALGA STREET over JORDAN CREEK (AMALGA ST), built 1982, carries 200 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 1-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 200 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

1930s

6
1950s

5
1960s

1
1970s

8
1980s

16
1990s

1
2000s

6
2010s

4

What this shows Construction peaked in the 1980s, when 16 of the county's bridges still in the inventory were built, which is 34% of those with a recorded year. That cohort is now 35 to 44 years old in the 2024 inventory. Its average build year is 1978, 11 years older than the Alaska average of 1989.

How Juneau City and County compares with Alaska's closest counties by inventory size

The 5 Alaska counties nearest Juneau City and County in number of bridges, with their condition splits. Its 2.1% Poor share is the 1st-lowest of these 6. Its average build year of 1978 against a peer-group mean of 1984 is 6 years older.

Showing the 5 closest of 26 Alaska counties eligible for comparison.

Bridge inventory size and condition shares for Juneau City and County and the 5 Alaska counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Southeast Fairbanks County	64	32.8%	54.7%	12.5%	1980
Wrangell City and County	58	44.8%	48.3%	6.9%	1990
Copper River County	52	46.2%	48.1%	5.8%	1984
Juneau City and County (this page)	47	36.2%	61.7%	2.1%	1978
Sitka City and County	37	45.9%	51.4%	2.7%	1989
Nome County	30	30%	63.3%	6.7%	1977

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 Juneau City and 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 Juneau City and County, both outside Alaska so the neighborhoods are not the same-state size table above.

Similar inventory size

Nearest county inventories outside AK (47 bridges here).

Jackson County, CO · 47 bridges
Ben Hill County, GA · 47 bridges
Long County, GA · 47 bridges
Benewah County, ID · 47 bridges

Similar average build year

Nearest mean year-built outside AK (1978 here).

Orange County, CA · avg 1978 · 1,164 bridges
Sumner County, KS · avg 1978 · 659 bridges
Allen County, IN · avg 1978 · 613 bridges
Livingston County, IL · avg 1978 · 579 bridges

Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.

All 47 Good 17 Fair 29 Poor 1

All bridges (47)

Sort:

Juneau City and County Bridge Snapshot

Condition distribution

Juneau City and County's Poor-condition bridges carry 200 vehicle crossings a day

42.6% of Juneau City and County's bridges have passed the 50-year mark

One structure carries 100% of the county's Poor-condition bridge traffic

How Juneau City and 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

All bridges (47)

9TH STREET

WILLOUGHBY AVE

DISTIN STREET

GLACIER HIGHWAY

JNU DOUGLAS BR RD

NINTH AND DIXON

GLACIER HIGHWAY

12TH STREET

CALHOUN AVENUE

BACK LOOP RD

NORTH DOUGLAS HWY

BASIN ROAD

DOUGLAS HIGHWAY

GLACIER HIGHWAY

MARINE HWY ROUTE

MARINE HWY ROUTE

FERRY TERMINAL RD

THANE ROAD

GLACIER HIGHWAY

BACK LOOP RD

EGAN DRIVE

EGAN DRIVE

EGAN DRIVE

NORTH DOUGLAS HWY

GLACIER HIGHWAY

EGAN DRIVE

EGAN DRIVE

OLD GLACIER HWY

EGAN DRIVE

FISH CREEK ROAD

BASIN ROAD

OLD GLACIER HWY

NO DATA ENTERED

TWIN LAKES DRIVE

GLACIER HIGHWAY

EGAN DRIVE

EGAN DRIVE

BACK LOOP RD

EGAN DRIVE

EGAN DRIVE

JORDAN AVENUE

AMALGA HARBOR RD

FISH CREEK ROAD

TROUT STREET

EGAN DRIVE

OLD GLACIER HWY

AMALGA STREET

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