Scour Critical Bridges in Idaho

215 bridges in Idaho 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 215 bridges in Idaho have been identified as vulnerable to scour damage.

Clear

Bridge	State	Scour Status	Condition	Year Built	ADT
SNAKE RIVER;KING HILL	Idaho	Scour Critical — Countermeasures Installed	Fair	1974	9,750
SNAKE RIVER;KING HILL	Idaho	Scour Critical — Countermeasures Installed	Fair	1974	9,750
S.FK.COEUR DALENE RIVER	Idaho	Scour Critical — Countermeasures Installed	Fair	1964	9,500
S.FK.COEUR DALENE RIVER	Idaho	Scour Critical — Countermeasures Installed	Fair	1964	9,500
PORTNEUF RIVER	Idaho	Scour Critical — Countermeasures Installed	Fair	1963	8,000
PORTNEUF RIVER	Idaho	Scour Critical — Countermeasures Installed	Fair	1963	8,000
INDIAN CREEK	Idaho	Scour Critical — Countermeasures Installed	Good	1978	8,000
S.FK.PAYETTE RIVER	Idaho	Scour Critical — Countermeasures Installed	Fair	1955	7,300
SALMON RIVER;SALMON BR.	Idaho	Scour Critical — Countermeasures Installed	Poor	1926	7,300
LAPWAI CREEK	Idaho	Scour Critical — Countermeasures Installed	Fair	1964	7,000
LAPWAI CREEK	Idaho	Scour Critical — Countermeasures Installed	Fair	1964	7,000
COEUR DALENE RIVER	Idaho	Scour Critical — Countermeasures Installed	Fair	1964	7,000
COEUR DALENE RIVER	Idaho	Scour Critical — Countermeasures Installed	Fair	1964	7,000
S 5750;PINE CR;PINEHURST	Idaho	Scour Critical — Countermeasures Installed	Fair	1965	7,000
S 5750;PINE CR;PINEHURST	Idaho	Scour Critical — Countermeasures Installed	Fair	1965	7,000
PORTNEUF RIVER	Idaho	Scour Critical — Countermeasures Installed	Fair	1968	6,750
PORTNEUF RIVER	Idaho	Scour Critical — Countermeasures Installed	Fair	1968	6,750
BOISE RIVER(BARBER BR)	Idaho	Scour Critical — Countermeasures Installed	Poor	1954	6,700
S.FK.COEUR DALENE RIVER	Idaho	Scour Critical — Countermeasures Installed	Fair	1969	6,250
S.FK.COEUR DALENE RIVER	Idaho	Scour Critical — Countermeasures Installed	Fair	1969	6,250
RAFT RIVER	Idaho	Scour Critical — Countermeasures Installed	Fair	1973	5,750
RAFT RIVER	Idaho	Scour Critical — Countermeasures Installed	Fair	1967	5,750
S.FK.COEUR DALENE RIVER	Idaho	Scour Critical — Countermeasures Installed	Fair	1978	5,750
S.FK.COEUR DALENE RIVER	Idaho	Scour Critical — Countermeasures Installed	Fair	1978	5,750
S.FK.COEUR DALENE RIVER	Idaho	Scour Critical — Countermeasures Installed	Fair	1976	5,600
BOISE RIVER	Idaho	Scour Critical — Countermeasures Installed	Fair	1976	5,500
BOISE RIVER	Idaho	Scour Critical — Countermeasures Installed	Fair	1932	5,500
SNAKE RIVER;NYSSA BRIDGE	Idaho	Scour Critical — Countermeasures Installed	Fair	1957	5,300
SNAKE RIVER;PAYETTE BR.	Idaho	Scour Critical — Countermeasures Installed	Poor	1953	5,100
PORTNEUF RIVER;MCCAMMON	Idaho	Scour Critical — Countermeasures Installed	Fair	1963	4,700
SNAKE RIVER;KEN CURTIS	Idaho	Scour Critical — Countermeasures Installed	Fair	1968	4,700
N.FK.PAYETTE RIVER	Idaho	Scour Critical — Countermeasures Installed	Fair	1984	4,700
DRY CREEK	Idaho	Scour Critical — Countermeasures Installed	Fair	1964	4,400
ROUND VALLEY CREEK	Idaho	Scour Critical — Countermeasures Installed	Fair	1933	4,100
PACK RIVER	Idaho	Scour Critical — Countermeasures Installed	Fair	1978	4,000
BOISE RIVER	Idaho	Scour Critical — Countermeasures Installed	Fair	1961	3,900
S.FK.COEUR DALENE RIVER	Idaho	Scour Critical — Countermeasures Installed	Fair	1978	3,200
RUSH CREEK	Idaho	Scour Critical — Countermeasures Installed	Fair	1956	3,200
WEISER RIVER	Idaho	Scour Critical — Countermeasures Installed	Fair	1954	3,200
PRIEST RIVER	Idaho	Scour Critical — Countermeasures Installed	Poor	1962	3,100
BEAR RIVER;RIVERDALE BR	Idaho	Scour Critical — Countermeasures Installed	Fair	1960	2,800
SNAKE RIVER	Idaho	Scour Critical — Countermeasures Installed	Fair	1967	2,800
PORTNEUF RIVER	Idaho	Scour Critical — Countermeasures Installed	Good	1968	2,700
CEDAR DRAW	Idaho	Scour Critical — Countermeasures Installed	Fair	1932	2,700
LITTLE SALMON RIVER	Idaho	Scour Critical — Countermeasures Installed	Fair	1961	2,600
LITTLE SALMON RIVER	Idaho	Scour Critical — Countermeasures Installed	Fair	1962	2,600
LITTLE SALMON RIVER	Idaho	Scour Critical — Countermeasures Installed	Fair	1962	2,600
LITTLE SALMON RIVER	Idaho	Scour Critical — Countermeasures Installed	Fair	1962	2,600
SPRING CREEK	Idaho	Scour Critical — Countermeasures Installed	Good	1962	2,600
MALAD R.;N.HAGERMAN BR.	Idaho	Scour Critical — Countermeasures Installed	Fair	1956	2,100

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