Petersburg County, AK

115 public highway bridges

Petersburg County Bridge Snapshot

Petersburg County, Alaska contains 115 public highway bridges in the FHWA National Bridge Inventory. Roughly 46.1% are rated “Good,” 45.2% “Fair,” 8.7% “Poor,” and 8.7% are classified as structurally deficient — the federal designation for spans whose deck, superstructure, or substructure has been rated 4 or below on the 0–9 NBI scale. Structurally deficient does not mean unsafe to cross; it means the bridge is on the priority list for repair or replacement.

Inspections in AK are conducted by certified engineers from the state Department of Transportation on a 24-month cycle, and results are reported back to the FHWA each spring. The list below shows every NBI-tracked bridge in the county, sorted by inventory load rating. Use the “Sort by” controls to surface the lowest-rated spans first, and click any row for full inspection history, traffic counts, and condition trends.

Source: FHWA National Bridge Inventory. See methodology for full definitions.

115
Total Bridges
46.1%
Good
8.7%
Poor
8.7%
Structurally Deficient

Condition Distribution

Good
46.1% (53)
Fair
45.2% (52)
Poor
8.7% (10)
SD
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 U.S. government datasets. See our methodology for details. Retrieved and formatted by PlainBridges Editorial