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
FIRST CREEK	Alaska	Scour Critical — Unaddressed	Poor	1985	—
Sourdough Creek	Alaska	Scour Critical — Countermeasures Ineffective	Good	2023	50
BRANCH DELTA RIVER	Alaska	Scour Critical — Countermeasures Ineffective	Good	2022	25
BRANCH OF DELTA RIVER	Alaska	Scour Critical — Countermeasures Ineffective	Good	2022	25
BOUNDRY SLOUGH	Alaska	Scour Critical — Countermeasures Ineffective	Poor	2012	10
UNNAMED CREEK	Alaska	Scour Critical — Countermeasures Ineffective	Fair	1982	10
UNNAMED CREEK	Alaska	Scour Critical — Countermeasures Ineffective	Fair	1982	10
BOUNDRY SLOUGH	Alaska	Scour Critical — Countermeasures Ineffective	Fair	2012	10
UNNAMED CREEK	Alaska	Scour Critical — Countermeasures Ineffective	Poor	1980	10
UNNAMED CREEK	Alaska	Scour Critical — Countermeasures Ineffective	Poor	1980	10
UNNAMED CREEK	Alaska	Scour Critical — Countermeasures Ineffective	Fair	1982	10
SUKKWAN STRAIT	Alaska	Scour Critical — Countermeasures Ineffective	Poor	1970	5
STREAM - HAMILTON 50R36	Alaska	Scour Critical — Countermeasures Ineffective	Fair	1983	—
CAMPBELL CR MINN DR S.B.	Alaska	Scour Critical — Countermeasures Installed	Fair	1985	13,900
CAMPBELL CR MINN DR N.B.	Alaska	Scour Critical — Countermeasures Installed	Good	1985	13,900
CHESTER CREEK	Alaska	Scour Critical — Countermeasures Installed	Fair	1985	10,700
CARLANNA CREEK	Alaska	Scour Critical — Countermeasures Installed	Fair	1973	9,210
CAMPBELL CREEK SB RAMP	Alaska	Scour Critical — Countermeasures Installed	Good	1981	5,660
CAMPBELL CREEK NB RAMP	Alaska	Scour Critical — Countermeasures Installed	Fair	1981	4,690
KENAI RIVER (SCHOONERS)	Alaska	Scour Critical — Countermeasures Installed	Fair	1954	2,900
KETCHIKAN CREEK FAIR ST	Alaska	Scour Critical — Countermeasures Installed	Fair	1967	2,480
KETCHIKAN CR PARK-UPPER	Alaska	Scour Critical — Countermeasures Installed	Fair	1967	2,298
GOLDSTREAM CREEK	Alaska	Scour Critical — Countermeasures Installed	Fair	1975	2,080
TANANA RIVER BIG DELTA	Alaska	Scour Critical — Countermeasures Installed	Fair	1966	1,990
NENANA RIVER PARK BND	Alaska	Scour Critical — Countermeasures Installed	Fair	1973	1,680
ANTLER CREEK	Alaska	Scour Critical — Countermeasures Installed	Fair	1969	1,380
BISON GULCH	Alaska	Scour Critical — Countermeasures Installed	Fair	1969	1,380
SKAGWAY RIVER	Alaska	Scour Critical — Countermeasures Installed	Fair	1974	1,200
SALMON CREEK	Alaska	Scour Critical — Countermeasures Installed	Fair	1972	1,180
CHULITNA RIVER	Alaska	Scour Critical — Countermeasures Installed	Fair	1970	1,120
SALMON RIVER	Alaska	Scour Critical — Countermeasures Installed	Poor	1976	1,020
BEAR CREEK	Alaska	Scour Critical — Countermeasures Installed	Fair	1965	910
EAST FORK CHULITNA RIVER	Alaska	Scour Critical — Countermeasures Installed	Fair	1967	900
LITTLE NELCHINA RIVER	Alaska	Scour Critical — Countermeasures Installed	Fair	1952	765
KING SALMON CREEK	Alaska	Scour Critical — Countermeasures Installed	Good	1960	760
BODENBURG CREEK	Alaska	Scour Critical — Countermeasures Installed	Fair	1980	660
SMALL CREEK	Alaska	Scour Critical — Countermeasures Installed	Fair	1974	600
AMERICAN RIVER	Alaska	Scour Critical — Countermeasures Installed	Fair	1974	600
STARRIGAVAN CREEK	Alaska	Scour Critical — Countermeasures Installed	Fair	1983	560
KLUTINA RIVER	Alaska	Scour Critical — Countermeasures Installed	Fair	1957	480
OLDS RIVER	Alaska	Scour Critical — Countermeasures Installed	Fair	1974	470
DEADMAN CREEK	Alaska	Scour Critical — Countermeasures Installed	Fair	1974	470
TIEKEL RIVER UPPER XING	Alaska	Scour Critical — Countermeasures Installed	Good	1978	440
BUSKIN RIVER NO 6	Alaska	Scour Critical — Countermeasures Installed	Fair	1980	380
CHILKAT RIVER	Alaska	Scour Critical — Countermeasures Installed	Fair	1958	340
TRIMS CREEK	Alaska	Scour Critical — Countermeasures Installed	Fair	1954	280
MICHAEL CREEK	Alaska	Scour Critical — Countermeasures Installed	Fair	1954	280
FLOOD CREEK	Alaska	Scour Critical — Countermeasures Installed	Fair	1954	280
BOULDER CREEK	Alaska	Scour Critical — Countermeasures Installed	Fair	1954	280
CASTNER CREEK	Alaska	Scour Critical — Countermeasures Installed	Poor	1958	280

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