Scour Critical Bridges in Alaska

159 bridges in Alaska at risk from water erosion around foundations.

Scour Critical Bridges

Scour is the erosion of soil and rock around a bridge's foundation caused by moving water. When foundations are exposed or undermined, a bridge can collapse even if its deck and superstructure are in good condition. Scour is the leading cause of bridge failures in the US. These 159 bridges in Alaska have been identified as vulnerable to scour damage.

Clear

Bridge	State	Scour Status	Condition	Year Built	ADT
COPPER RIV (FLAG PT WST)	Alaska	Scour Critical — Countermeasures Installed	Fair	1973	40
COPPER RIV (RND ISLAND)	Alaska	Scour Critical — Countermeasures Installed	Good	1973	40
COPPER DELTA	Alaska	Scour Critical — Countermeasures Installed	Fair	1977	40
COPPER DELTA	Alaska	Scour Critical — Countermeasures Installed	Fair	1977	40
SITUK RIVER	Alaska	Scour Critical — Countermeasures Installed	Fair	1966	40
COPPER RIVER (FLAG PT E)	Alaska	Scour Critical — Countermeasures Installed	Fair	1973	40
WISEMAN BRIDGE	Alaska	Scour Critical — Countermeasures Installed	Fair	1995	40
LITTLE TOK OVERFLOW	Alaska	Scour Critical — Countermeasures Installed	Good	1954	30
SPENCER CREEK	Alaska	Scour Critical — Countermeasures Installed	Fair	1996	30
STANDARD CREEK	Alaska	Scour Critical — Countermeasures Installed	Poor	2006	30
FORTUNE CREEK	Alaska	Scour Critical — Countermeasures Installed	Good	2023	30
KARI CREEK	Alaska	Scour Critical — Countermeasures Installed	Fair	1996	30
FORTY MILE RIVER	Alaska	Scour Critical — Countermeasures Installed	Good	1974	20
CHINKELYES CREEK	Alaska	Scour Critical — Countermeasures Installed	Fair	2002	20
FOUR MILE CREEK	Alaska	Scour Critical — Countermeasures Installed	Good	1983	20
TIMBERLINE CREEK	Alaska	Scour Critical — Countermeasures Installed	Good	1981	20
WILLOW CREEK	Alaska	Scour Critical — Countermeasures Installed	Fair	1987	20
DUNBAR CREEK	Alaska	Scour Critical — Countermeasures Installed	Good	2000	20
STARISKI CREEK	Alaska	Scour Critical — Countermeasures Installed	Fair	1996	20
LIEF CREEK	Alaska	Scour Critical — Countermeasures Installed	Fair	2007	20
OTTER CREEK	Alaska	Scour Critical — Countermeasures Installed	Fair	2007	20
SMITH CREEK	Alaska	Scour Critical — Countermeasures Installed	Fair	1979	18
VILLAGE CREEK	Alaska	Scour Critical — Countermeasures Installed	Fair	1978	16
TRAIL CREEK	Alaska	Scour Critical — Countermeasures Installed	Fair	1951	15
CROOKED CREEK	Alaska	Scour Critical — Countermeasures Installed	Fair	1981	15
SMALL POINT CREEK	Alaska	Scour Critical — Countermeasures Installed	Fair	1980	15
TETLIN RIVER	Alaska	Scour Critical — Countermeasures Installed	Fair	1981	14
SHAGELUK SLOUGH	Alaska	Scour Critical — Countermeasures Installed	Poor	1978	11
OTTER CREEK	Alaska	Scour Critical — Countermeasures Installed	Poor	1947	10
PETERS CREEK	Alaska	Scour Critical — Countermeasures Installed	Fair	1938	10
NORTH FORK ANCHOR RIVER	Alaska	Scour Critical — Countermeasures Installed	Fair	1987	10
MUKLUK CREEK	Alaska	Scour Critical — Countermeasures Installed	Fair	1956	10
LITTLE SALMON RIVER	Alaska	Scour Critical — Countermeasures Installed	Fair	2009	10
CLEAR CREEK (HAINES)	Alaska	Scour Critical — Countermeasures Installed	Fair	1995	10
PORCUPINE CREEK	Alaska	Scour Critical — Countermeasures Installed	Fair	2012	10
BEAR CREEK	Alaska	Scour Critical — Countermeasures Installed	Fair	2003	10
GLACIER CREEK	Alaska	Scour Critical — Countermeasures Installed	Good	2023	10
JENNY M CREEK	Alaska	Scour Critical — Countermeasures Installed	Good	2002	10
CHENEGA CREEK	Alaska	Scour Critical — Countermeasures Installed	Fair	1982	10
NORTH FORK ANCHOR RIVER	Alaska	Scour Critical — Countermeasures Installed	Fair	1987	10
UNNAMED CREEK	Alaska	Scour Critical — Countermeasures Installed	Poor	1980	10
NELSON SLOUGH	Alaska	Scour Critical — Countermeasures Installed	Fair	1998	10
GEORGES CREEK	Alaska	Scour Critical — Countermeasures Installed	Fair	1997	10
BOSTWICK NO. 2	Alaska	Scour Critical — Countermeasures Installed	Fair	2006	10
BOSTWICK NO. 3	Alaska	Scour Critical — Countermeasures Installed	Fair	2006	10
BOSTWICK NO. 4	Alaska	Scour Critical — Countermeasures Installed	Fair	2006	10
BOSTWICK NO. 5	Alaska	Scour Critical — Countermeasures Installed	Fair	2006	10
BOSTWICK NO. 6	Alaska	Scour Critical — Countermeasures Installed	Fair	2006	10
CREEK NAME NOT LISTED	Alaska	Scour Critical — Countermeasures Installed	Fair	1981	10
CREEK NAME NOT LISTED	Alaska	Scour Critical — Countermeasures Installed	Fair	1980	10

Scour Critical Rating Codes

Code 2 — Unaddressed	Bridge is scour critical with no countermeasures installed. The foundation is vulnerable and no protective action has been taken.
Code 3 — Countermeasures Installed	Protective measures (riprap, sheet piling, etc.) have been installed to reduce scour risk, but the bridge remains classified as scour critical.
Code 6 — Countermeasures Ineffective	Protective measures were installed but have been assessed as ineffective. The bridge requires re-evaluation and additional action.

About Scour Critical Bridges

Scour critical bridges have been identified through underwater inspection or analysis as having foundations that are unstable or could become unstable during flood conditions. FHWA requires action plans for all scour critical bridges. Famous scour failures include the 1987 Schoharie Creek Bridge collapse in New York.

All Bridges Poor Condition Historic Bridges Bridge Stats