Petersburg County, AK

115 public highway bridges

Petersburg County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Petersburg County, Alaska contains 115 public highway bridges. Roughly 46.1% are rated “Good,” 45.2% “Fair,” and 8.7% “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.

115
Total Bridges
46.1%
Good
45.2%
Fair
8.7%
Poor Condition

Condition Distribution

Good
46.1% (53)
Fair
45.2% (52)
Poor
8.7% (10)

All Bridges (115)

NO DATA ENTERED

Fair

Over: NO DATA ENTERED

THOMAS BAY, Petersburg, AK

Built 2006 Load: 74.2 t

NO DATA ENTERED

Fair

Over: NO DATA ENTERED

TONKA, Petersburg, AK

Built 2004 Load: 92.7 t ADT: 5

LOGGING ROAD

Good

Over: STREAM

MITKOF ISLAND, Petersburg, AK

Built 1987 Load: 16.2 t ADT: 30

LOGGING ROAD

Good

Over: STREAM

MITKOF ISLAND, Petersburg, AK

Built 1987 Load: 16.2 t ADT: 30

LOGGING ROAD

Good

Over: STREAM

KUIU ISLAND, Petersburg, AK

Built 1985 Load: 16.2 t ADT: 5

LOGGING ROAD

Good

Over: STREAM

KUIU ISLAND, Petersburg, AK

Built 1984 Load: 16.2 t ADT: 5

LOGGING ROAD

Good

Over: STREAM

KUIU ISLAND, Petersburg, AK

Built 1985 Load: 16.2 t ADT: 5

LOGGING ROAD

Good

Over: STREAM

KUPREANOF ISLAND, PORTAGE, Petersburg, AK

Built 1990 Load: 19.8 t

NO DATA ENTERED

Good

Over: STREAM

MITKOF ISLAND, Petersburg, AK

Built 1990 Load: 19.8 t ADT: 10

ROAD

Good

Over: STREAM

MITKOF ISLAND, Petersburg, AK

Built 1985 Load: 19.8 t ADT: 10

ROAD

Good

Over: STREAM

MITKOF ISLAND, Petersburg, AK

Built 1990 Load: 19.8 t ADT: 10

LOGGING ROAD

Good

Over: STREAM

KUIU ISLAND, Petersburg, AK

Built 1991 Load: 20.4 t ADT: 5

LOGGING ROAD

Good

Over: NO DATA ENTERED

KUIU ISLAND, Petersburg, AK

Built 1994 Load: 23.7 t

LOGGING ROAD

Good

Over: STREAM

KUPREANOF ISLAND AT KAKE, Petersburg, AK

Built 1998 Load: 30.5 t

LOGGING ROAD

Good

Over: STREAM

KUPREANOF ISLAND AT KAKE, Petersburg, AK

Built 1978 Load: 31.1 t ADT: 10

LOGGING ROAD

Good

Over: NO DATA ENTERED

KUIU ISLAND, Petersburg, AK

Built 1999 Load: 31.8 t ADT: 5

LOGGING ROAD

Good

Over: STREAM

KUIU ISLAND, Petersburg, AK

Built 2000 Load: 32.7 t ADT: 5

LOGGING ROAD

Good

Over: STREAM

KUPREANOF ISLAND, PORTAGE, Petersburg, AK

Built 1997 Load: 32.7 t

LOGGING ROAD

Good

Over: STREAM

KUPREANOF ISLAND AT KAKE, Petersburg, AK

Built 1996 Load: 32.7 t

LOGGING ROAD

Good

Over: STREAM

KUIU ISLAND, Petersburg, AK

Built 1977 Load: 32.7 t ADT: 5

6415

Good

Over: NO DATA ENTERED

KUIU ISLAND, Petersburg, AK

Built 2002 Load: 32.7 t ADT: 5

LOGGING ROAD

Good

Over: STREAM

KUPREANOF ISLAND AT KAKE, Petersburg, AK

Built 1998 Load: 32.7 t ADT: 10

LOGGING ROAD

Good

Over: STREAM

KUPREANOF ISLAND AT KAKE, Petersburg, AK

Built 1998 Load: 32.7 t ADT: 10

LOGGING ROAD

Good

Over: STREAM

KUPREANOF ISLAND AT KAKE, Petersburg, AK

Built 1998 Load: 32.7 t ADT: 10

LOGGING ROAD

Good

Over: STREAM

KUPREANOF ISLAND AT KAKE, Petersburg, AK

Built 1998 Load: 32.7 t

LOGGING ROAD

Good

Over: NO DATA ENTERED

TONKA, Petersburg, AK

Built 2003 Load: 32.7 t ADT: 10

NO DATA ENTERED

Good

Over: NO DATA ENTERED

KUPREANOF ISLAND AT KAKE, Petersburg, AK

Built 2003 Load: 32.7 t ADT: 10

NO DATA ENTERED

Good

Over: STREAM

MITKOF ISLAND, Petersburg, AK

Built 2000 Load: 32.7 t ADT: 10

ROAD

Good

Over: STREAM

KUPREANOF ISLAND, PORTAGE, Petersburg, AK

Built 1996 Load: 32.7 t

LOGGING ROAD

Good

Over: STREAM

KUIU ISLAND, Petersburg, AK

Built 1998 Load: 32.7 t

LOGGING ROAD

Good

Over: NO DATA ENTERED

KUIU ISLAND, Petersburg, AK

Built 2003 Load: 32.7 t

NO DATA ENTERED

Good

Over: NO DATA ENTERED

TONKA, Petersburg, AK

Built 2004 Load: 32.7 t ADT: 5

LOGGING ROAD

Good

Over: STREAM

KUPREANOF ISLAND AT KAKE, Petersburg, AK

Built 2003 Load: 32.7 t ADT: 10

NO DATA ENTERED

Good

Over: NO DATA ENTERED

MITKOF ISLAND, Petersburg, AK

Built 2010 Load: 32.7 t ADT: 50

LOGGING ROAD

Good

Over: STREAM

KUPREANOF ISLAND AT KAKE, Petersburg, AK

Built 1983 Load: 38.2 t ADT: 10

LOGGING ROAD

Good

Over: STREAM

TONKA, Petersburg, AK

Built 1990 Load: 38.9 t ADT: 5

LOGGING ROAD

Good

Over: STREAM

MITKOF ISLAND, Petersburg, AK

Built 2017 Load: 39.9 t ADT: 50

LOGGING ROAD

Good

Over: STREAM

KUIU ISLAND, Petersburg, AK

Built 1991 Load: 40.2 t

MITKOF HIGHWAY

Good

Over: OHMER CREEK

MILE POINT 20.2, Petersburg, AK

Built 2007 Load: 40.4 t ADT: 80

MITKOF HIGHWAY

Good

Over: TWIN CREEK

MILE POINT 6.6, Petersburg, AK

Built 1996 Load: 40.4 t ADT: 760

LOGGING ROAD

Good

Over: STREAM

MITKOF ISLAND, Petersburg, AK

Built 1980 Load: 42.1 t ADT: 50

LOGGING ROAD

Good

Over: STREAM

KUIU ISLAND, Petersburg, AK

Built 1991 Load: 43.1 t

LOGGING ROAD

Good

Over: STREAM

KUIU ISLAND, Petersburg, AK

Built 1990 Load: 43.4 t ADT: 5

6402-20.96

Good

Over: STREAM

KUIU ISLAND, Petersburg, AK

Built 1991 Load: 44.1 t

LOGGING ROAD

Good

Over: STREAM

KUPREANOF ISLAND AT KAKE, Petersburg, AK

Built 1984 Load: 45.4 t ADT: 10

LOGGING ROAD

Good

Over: STREAM

KUPREANOF ISLAND AT KAKE, Petersburg, AK

Built 1983 Load: 45.7 t ADT: 10

LOGGING ROAD

Good

Over: STREAM

MITKOF ISLAND, Petersburg, AK

Built 1987 Load: 46.0 t ADT: 10

LOGGING ROAD

Good

Over: STREAM

KUIU ISLAND, Petersburg, AK

Built 1984 Load: 46.0 t ADT: 5

LOGGING ROAD

Good

Over: STREAM

MITKOF ISLAND, Petersburg, AK

Built 1984 Load: 47.3 t ADT: 10

LOGGING ROAD

Good

Over: STREAM

TONKA, Petersburg, AK

Built 1990 Load: 47.3 t ADT: 5

Read our methodology - how this data is sourced, computed, and verified.

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Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainBridges

Every figure on PlainBridge 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.