Scour-Critical Bridges in Nevada

Nevada has 85 bridges rated scour-critical by the Federal Highway Administration. These bridges have foundations that are unstable or at risk of undermining during flood events. Scour-critical doesn't mean a bridge is about to collapse — it means extra monitoring and countermeasures are in place — but these structures are priorities for repair or replacement.

How this ranking works

This state list filters to NBI scour ratings 0 through 3, then sorts by average daily traffic. It is intended to show flood-vulnerability exposure, not to label any bridge as currently unsafe.

Bridge	County	Scour Rating	Daily Traffic	Condition
SR 659/mccarran over Uprr & Truckee River	Washoe	3 — Serious	27,000	Fair
SR 659/mccarran over Truckee River	Washoe	3 — Serious	22,200	Fair
I 15 over Muddy River	Clark	3 — Serious	19,250	Fair
I 15 over Muddy River	Clark	3 — Serious	19,250	Fair
I 80 over Truckee River & Sprr	Washoe	3 — Serious	18,750	Fair
I 80 over Truckee River & Sprr	Washoe	3 — Serious	18,750	Fair
12th ST over Humboldt Rvr	Elko	3 — Serious	18,400	Fair
US 50 over Carson River	Churchill	3 — Serious	16,800	Fair
US 395n over Carson Rvr	Douglas	3 — Serious	16,750	Fair
US 395s over Carson Rvr	Douglas	3 — Serious	16,750	Good
IRR US 395n over Cradlebaugh Slough	Douglas	3 — Serious	16,750	Fair
IRR US 395s over Cradlebaugh Slough	Douglas	3 — Serious	16,750	Fair
Owens Av over Las Vegas Wash	Clark	3 — Serious	16,700	Fair
I 80 over Truckee River	Washoe	3 — Serious	16,500	Fair
I 80 over Truckee River	Washoe	3 — Serious	16,500	Fair
Stewart Av over Las Vegas Wash	Clark	3 — Serious	16,000	Good
Longley LN over Airport Slough	Washoe	3 — Serious	14,800	Fair
I 80e over Truckee Rvr	Storey	3 — Serious	13,950	Fair
I 80w over Truckee Rvr	Washoe	3 — Serious	13,950	Fair
Arlington Av over Truckee Rvr	Washoe	3 — Serious	13,000	Fair
SR 88 Woodfords RD over E Fork Carson Rvr	Douglas	3 — Serious	12,800	Fair
SR 88/woodford RD over Cottonwood Slough	Douglas	3 — Serious	12,800	Good
Keystone Av over Truckee River	Washoe	3 — Serious	12,800	Poor
I 15n over Toquop Wash	Clark	3 — Serious	12,400	Good
I 15s over Toquop Wash	Clark	3 — Serious	12,400	Fair
Russell RD over Duck Crk	Clark	3 — Serious	12,000	Good
Russell RD over Duck Crk	Clark	3 — Serious	12,000	Good
Greg ST over Truckee River	Washoe	3 — Serious	11,200	Fair
Sr88 Woodfords RD over Rocky Slough	Douglas	3 — Serious	9,850	Good
Riverview Drive over Rocky Slough	Douglas	3 — Serious	9,100	Good
Riverview Drive over East Fork Carson River	Douglas	3 — Serious	9,100	Fair
Rock Bl over Truckee Rvr	Washoe	3 — Serious	8,750	Fair
SR 667/kietzke LN over Truckee River	Washoe	3 — Serious	7,950	Fair
SR 667/kietzke LN over Truckee River	Washoe	3 — Serious	7,950	Fair
Sierra ST over Truckee Rvr	Washoe	3 — Serious	7,600	Poor
SR 227/lamoille RD over Water ST Sp&uprr&hmblt R	Elko	3 — Serious	6,900	Good
Lake ST over Truckee Rvr	Washoe	3 — Serious	6,900	Fair
Kirman Av over Truckee River	Washoe	3 — Serious	6,800	Fair
US 95 over Humboldt Rvr	Humboldt	3 — Serious	6,550	Fair
Sr169 Logandale RD over Muddy Rvr	Clark	3 — Serious	5,300	Fair
Sr159 Charleston over Red Rock Wash	Clark	3 — Serious	5,000	Good
I 80 over N. Fork Humboldt River	Elko	3 — Serious	4,525	Good
I 80 over N. Fork Humboldt River	Elko	3 — Serious	4,525	Good
SR 88 Woodfords RD over Brockliss Slough	Douglas	3 — Serious	4,500	Good
I 80e over Humboldt River	Eureka	3 — Serious	4,125	Fair
I 80w over Humboldt Rvr	Eureka	3 — Serious	4,125	Fair
Kuenzli ST over Truckee River	Washoe	3 — Serious	3,900	Fair
Mayberry DR over Truckee River	Washoe	3 — Serious	3,900	Fair
I 80 over Nnrr & E. Squaw Creek	Elko	3 — Serious	3,450	Fair
I 80 over Nnrr & E. Squaw Creek	Elko	3 — Serious	3,450	Fair
US 93 over Salmon Falls Crk	Elko	3 — Serious	3,200	Fair
US 95a over Carson Rvr	Lyon	3 — Serious	2,900	Fair
White Fir ST over Truckee River	Washoe	3 — Serious	2,600	Fair
Frcl19 Glendale RD over Muddy Rvr	Clark	3 — Serious	2,200	Fair
Sr168 Glendale RD over Muddy Rvr	Clark	3 — Serious	2,200	Fair
Northshore Road over Las Vegas Wash	Clark	3 — Serious	2,000	Fair
Bridge Street over Truckee River	Washoe	3 — Serious	1,815	Fair
Sr757 Muller LN over Carson Rvr	Douglas	3 — Serious	1,750	Fair
US 93 over Meadow Valley Wash	Clark	3 — Serious	1,600	Fair
US 93 over Meadow Valley Wash	Lincoln	3 — Serious	1,600	Fair
SR 206/genoa LN over Carson River	Douglas	3 — Serious	1,500	Fair
SR 208 Topaz RD over W Walker Rvr Wilson C	Lyon	3 — Serious	1,500	Fair
SR 447 Gerlach RD over Truckee Rvr	Washoe	3 — Serious	1,300	Fair
County Road over Lousetown Crk	Storey	3 — Serious	1,000	Fair
Fr Wa16 over Truckee Rvr	Washoe	3 — Serious	820	Fair
US 93 over Meadow Valley Wash	Lincoln	3 — Serious	740	Good
Castillia ST over Dry Wash	Clark	3 — Serious	500	Fair
SR 278 Eureka-carl over Humboldt Rvr	Elko	3 — Serious	480	Fair
IRR Sr225 Mnt City over E Fork Owyhee Rvr	Elko	3 — Serious	400	Fair
Irish American RD over Humboldt Rvr	Pershing	3 — Serious	350	Good
SR 229/halleck RD over Humboldt River	Elko	3 — Serious	260	Poor
SR 229/halleck RD over Humboldt River	Elko	3 — Serious	260	Fair
Joy Lake RD over Galena Crk	Washoe	3 — Serious	243	Fair
AVE De Couleurs over Lousetown Crk	Storey	3 — Serious	139	Poor
Snyder LN over Walker Rvr	Lyon	3 — Serious	121	Good
Eldorado Access Ro over Eldorado Canyon	Clark	3 — Serious	103	Fair
Sr230 Starr Vly RD over Marys Rvr	Elko	3 — Serious	100	Fair
Sr230 Starr Vly RD over Humboldt Rvr	Elko	3 — Serious	100	Fair
SR 781 Palisade Br over Humboldt Rvr	Eureka	3 — Serious	88	Good
Old SR 3c E. Wk.r over East Fork Walker Rvr	Lyon	3 — Serious	85	Poor
Lux LN over Walker Rvr	Lyon	3 — Serious	61	Fair
Tungsten RD over Pit Taylor Canal	Pershing	3 — Serious	50	Fair
Callahan Road over Humboldt River	Pershing	3 — Serious	50	Good
Sr722 Carroll Summ over Eastgate Wash	Churchill	3 — Serious	40	Fair
Farm District Road over Truckee-carson Canal	Churchill	3 — Serious	11	Fair