Total bridges
134
Public highway bridges in Anchorage County
County profile · official public datasets
Anchorage County, AK
134 public highway bridges tracked in the FHWA National Bridge Inventory: 49.3% rated Good, 50% Fair, 0.7% Poor.
- 134
- Public bridges
- 49.3%
- Good condition
- 0.7%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Anchorage County posts a top-quartile lowest Poor-condition share among rated counties in the state across mid-size county bridge inventory.
- Top 11%
- lowest Poor share in state
- 0.7%
- Poor-condition share
- 134
- public highway bridges
- 1992
- 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.
Anchorage County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Anchorage County ranks #3 of 27 Alaska counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 0.7%). Anchorage County, Alaska contains 134 public highway bridges. Roughly 49.3% are rated “Good,” 50% “Fair,” and 0.7% “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
49.3%
66 of 134 rated 7-9
Fair condition
50%
67 of 134 rated 5-6
Poor condition
0.7%
1 of 134 rated 4 or below
In-state Poor-share rank
#3 of 27
Among Alaska counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 134 NBI-tracked bridges by lowest applicable component rating.
Good 49.3% (66)
Fair 50% (67)
Poor 0.7% (1)
Anchorage County's Poor-condition bridges carry 50 vehicle crossings a day
That is 0% of the county's reported daily bridge traffic on 0.7% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 50 crossings a day against 9,132 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 134 of 134 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
16.4% of Anchorage County's bridges have passed the 50-year mark
22 of the 134 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 49.3% 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
STARNER ROAD over PETERS CREEK, built 1989, carries 50 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 50 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Anchorage County's bridges were built
134 bridges with a recorded construction year, grouped by decade
- 1950s 2
1950–1959
2 bridges
- 1960s
1960–1969
11 bridges
- 1970s
1970–1979
26 bridges
- 1980s
1980–1989
27 bridges
- 1990s
1990–1999
20 bridges
- 2000s
2000–2009
22 bridges
- 2010s
2010–2019
18 bridges
- 2020s 8
2020–2029
8 bridges
What this shows Construction peaked in the 1980s, when 27 of the county's bridges still in the inventory were built, which is 20.1% of those with a recorded year. That cohort is now 35 to 44 years old in the 2024 inventory. Its average build year (1992) matches the Alaska average (1989).
How Anchorage County compares with Alaska's closest counties by inventory size
The 5 Alaska counties nearest Anchorage County in number of bridges, with their condition splits. Its 0.7% Poor share is the 1st-lowest of these 6. Its average build year of 1992 against a peer-group mean of 1991 is in line with the group.
Showing the 5 closest of 26 Alaska counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Petersburg County | 141 | 44.7% | 47.5% | 7.8% | 1992 |
| Anchorage County (this page) | 134 | 49.3% | 50% | 0.7% | 1992 |
| 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 | 103 | 35.9% | 50.5% | 13.6% | 1988 |
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 Anchorage 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 Anchorage County, both outside Alaska so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside AK (134 bridges here).
- Knott County, KY · 134 bridges
- Murray County, MN · 134 bridges
- Steele County, MN · 134 bridges
- Lawrence County, MS · 134 bridges
Similar average build year
Nearest mean year-built outside AK (1992 here).
- Johnson County, KS · avg 1992 · 781 bridges
- Wake County, NC · avg 1992 · 760 bridges
- Benton County, AR · avg 1992 · 410 bridges
- Nodaway County, MO · avg 1992 · 396 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
Fair-condition bridges (67)
GLENN HIGHWAY
FairOver: GLENN HWY OVERHEAD SB
MILE POINT 25.3, Anchorage, AK
Built 1977 Load: 36.7 t ADT: 14,600
MCCARREY STREET
FairOver: MCCARREY OC
MILE POINT 0.1, Anchorage, AK
Built 1986 Load: 37.3 t ADT: 3,160
GLENN HIGHWAY
FairOver: KNIK RIVER NORTHBOUND
MILE POINT 28.7, Anchorage, AK
Built 1965 Load: 37.4 t ADT: 13,300
OLD GLENN PALMER
FairOver: OLD GLENN OVERCROSSING
MILE POINT 0.2, Anchorage, AK
Built 1994 Load: 37.8 t ADT: 1,260
EAGLE RIVER ACCESS
FairOver: NORTH EAGLE RIVER O.C.
MILE POINT 0.2, Anchorage, AK
Built 1991 Load: 38.2 t ADT: 6,730
EAGLE VIEW DRIVE
FairOver: EAGLE RIVER W FRONTAGE
MILE POINT 0.6, Anchorage, AK
Built 1974 Load: 38.3 t ADT: 1,000
BIRCHWOOD LOOP RD
FairOver: NORTH BIRCHWOOD OC
MILE POINT 6.2, Anchorage, AK
Built 1983 Load: 38.5 t ADT: 4,350
DE ARMOUN ROAD
FairOver: DE ARMOUN OVERCROSSING
MILE POINT 0.3, Anchorage, AK
Built 1990 Load: 39.6 t ADT: 5,350
HOMER DRIVE
FairOver: CAMPBELL CR W FRONTAGE
MILE POINT 0.3, Anchorage, AK
Built 2012 Load: 40.4 t ADT: 490
ELMORE ROAD
FairOver: SOUTH FORK CAMPBELL CR
MILE POINT 2.5, Anchorage, AK
Built 2007 Load: 40.4 t ADT: 20,800
BRAGAW STREET
FairOver: BRAGAW ST OVERCROSSING
MILE POINT 1.6, Anchorage, AK
Built 2008 Load: 40.4 t ADT: 10,500
GLENN HIGHWAY
FairOver: SOUTH BIRCHWOOD UC - SB
MILE POINT 16.0, Anchorage, AK
Built 1980 Load: 40.9 t ADT: 18,850
OLD SEWARD HIGHWAY
FairOver: RABBIT CR OVERCROSSING
MILE POINT 0.4, Anchorage, AK
Built 1990 Load: 43.1 t ADT: 10,200
GLENN HIGHWAY
FairOver: GLENN HWY OVERHEAD NB
MILE POINT 25.3, Anchorage, AK
Built 1977 Load: 43.5 t ADT: 14,600
GLENN HIGHWAY
FairOver: PETERS CREEK SOUTHBOUND
MILE POINT 19.8, Anchorage, AK
Built 1977 Load: 44.1 t ADT: 18,250
HILLCREST DR
FairOver: HILLCREST OVERCROSSING
MILE POINT 0.2, Anchorage, AK
Built 1967 Load: 44.8 t ADT: 2,110
POST ROAD
FairOver: SHIP CREEK (POST ROAD)
ANCHORAGE, Anchorage, AK
Built 1972 Load: 99.9 t ADT: 3,160
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.