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Scour-Critical Bridges in California

California has 599 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.

BridgeCountyScour RatingDaily TrafficCondition
Interstate 405 over San Gabriel RiverLos Angeles3 — Serious255,000Fair
State Route 60 over Rio HondoLos Angeles3 — Serious224,000Fair
Interstate 80 over Suisun CreekSolano3 — Serious202,000Poor
Sunrise BLVD over American RiverSacramento3 — Serious78,370Fair
State Route 29 over Nvrr Napa River StanlyNapa3 — Serious48,000Poor
State Route 20 over Feather River K ST Up RrSutter3 — Serious48,000Fair
E22&s605-n405 Conn over San Gabriel RiverLos Angeles3 — Serious40,000Fair
Interstate 10 WB over Whitewater RiverRiverside3 — Serious39,500Fair
Interstate 10 EB over Whitewater RiverRiverside3 — Serious39,500Fair
State Route 126 over Oleary CreekVentura3 — Serious37,500Fair
W Evelyn ST over Stevens CreekSanta Clara3 — Serious30,000Fair
Ramona Expressway over Perris Valley Storm DrnRiverside3 — Serious26,340Good
Interstate 10 EB over Irolo DitchRiverside3 — Serious23,100Good
Interstate 10 WB over Tecka DitchRiverside3 — Serious23,100Fair
Interstate 10 EB over Tecka DitchRiverside3 — Serious23,100Fair
Interstate 10 WB over Beta DitchRiverside3 — Serious23,100Good
Interstate 10 EB over Beta DitchRiverside3 — Serious23,100Good
Interstate 10 WB over Krume DitchRiverside3 — Serious23,100Good
Interstate 10 EB over Krume DitchRiverside3 — Serious23,100Good
Interstate 10 WB over Orris DitchRiverside3 — Serious23,100Good
Interstate 10 WB over Taro DitchRiverside3 — Serious23,000Good
Interstate 10 EB over Taro DitchRiverside3 — Serious23,000Good
Interstate 10 WB over Bula DitchRiverside3 — Serious23,000Good
Interstate 10 EB over Bula DitchRiverside3 — Serious23,000Good
Interstate 10 WB over Union DitchRiverside3 — Serious23,000Fair
Interstate 10 EB over Union DitchRiverside3 — Serious23,000Good
Interstate 10 WB over Shanty DitchRiverside3 — Serious23,000Good
Interstate 10 EB over Shanty DitchRiverside3 — Serious23,000Fair
Interstate 10 WB over Ajax DitchRiverside3 — Serious23,000Good
Interstate 10 EB over Ajax DitchRiverside3 — Serious23,000Good
Interstate 10 EB over Orris DitchRiverside3 — Serious23,000Good
Interstate 10 WB over Determination DitchRiverside3 — Serious23,000Fair
Interstate 10 EB over Determination DitchRiverside3 — Serious23,000Good
S405-n605 Conn over RTE 405 605 Conn RivOrange3 — Serious22,800Fair
Monterey Road over W. Little Llagas CreekSanta Clara3 — Serious22,000Good
Interstate 10 WB over Rollie DitchRiverside3 — Serious21,400Good
Interstate 10 EB over Rollie DitchRiverside3 — Serious21,400Good
Interstate 10 WB over Ghost DitchRiverside3 — Serious21,400Good
Interstate 10 EB over Ghost DitchRiverside3 — Serious21,400Good
Interstate 10 WB over Quartz DitchRiverside3 — Serious21,400Good
Interstate 10 EB over Quartz DitchRiverside3 — Serious21,400Good
Interstate 10 WB over Coxcomb DitchRiverside3 — Serious21,400Good
Interstate 10 EB over Coxcomb DitchRiverside3 — Serious21,400Good
State Route 62 EB over Mission Channel OverflowRiverside3 — Serious20,910Fair
Malibu Cyn RD over Malibu CrkLos Angeles3 — Serious20,753Poor
State Route 33 over San Antonio CreekVentura3 — Serious20,500Poor
North State ST over Forsythe CreekMendocino3 — Serious20,200Fair
N. First ST over Dry Creek CanalFresno3 — Serious19,941Fair
Interstate 40 over Bloom WashSan Bernardino3 — Serious19,500Fair
Interstate 40 over Bloom WashSan Bernardino3 — Serious19,500Fair
Interstate 40 over Blossom WashSan Bernardino3 — Serious19,500Fair
Interstate 40 over Blossom WashSan Bernardino3 — Serious19,500Fair
Interstate 40 over Airport WashSan Bernardino3 — Serious19,500Good
Interstate 40 over Airport WashSan Bernardino3 — Serious19,500Good
Interstate 40 over Lava WashSan Bernardino3 — Serious19,500Good
Interstate 40 over Lava WashSan Bernardino3 — Serious19,500Good
Interstate 40 over Gas Line WashSan Bernardino3 — Serious19,500Good
Interstate 40 over Gas Line WashSan Bernardino3 — Serious19,500Fair
Gilman Springs Rd. over Potrero CreekRiverside3 — Serious19,252Fair
Vallecitos Road over Arroyo Del ValleAlameda3 — Serious19,250Poor
Interstate 15 NB over Ivanpah DitchSan Bernardino3 — Serious19,000Good
Interstate 15 SB over Mescal DitchSan Bernardino3 — Serious18,500Good
Interstate 15 NB over Mescal DitchSan Bernardino3 — Serious18,500Good
Interstate 15 SB over Clark Mountain DitchSan Bernardino3 — Serious18,500Good
Interstate 15 NB over Clark Mountain DitchSan Bernardino3 — Serious18,500Good
Interstate 15 SB over Mohawk DitchSan Bernardino3 — Serious18,500Good
Interstate 15 SB over Micro DitchSan Bernardino3 — Serious18,500Fair
Interstate 15 SB over Wheaton WashSan Bernardino3 — Serious18,500Poor
Riverside AVE over Dry CreekPlacer3 — Serious18,000Good
Market Street over Santa Ana RiverRiverside3 — Serious17,821Fair
State Route 1 over Trancas CreekLos Angeles2 — Critical17,100Poor
Seventh Street over Tuolumne RiverStanislaus3 — Serious16,815Fair
Old Redwood HWY over Mark West CreekSonoma3 — Serious16,600Fair
Interstate 40 over Badger WashSan Bernardino3 — Serious16,500Fair
Stevens CR BLVD over Stevens CreekSanta Clara3 — Serious15,041Fair
Trancas ST over Napa RiverNapa3 — Serious14,755Fair
State Route 1 SB over Pilarcitos CreekSan Mateo3 — Serious14,750Good
State Route 1 NB over Pilarcitos CreekSan Mateo3 — Serious14,750Fair
Cajalco Road over Temescal WashRiverside3 — Serious14,721Fair
Depot ST over Ulatis CreekSolano3 — Serious14,480Fair
Camino Del Mar over San Dieguito RiverSan Diego3 — Serious14,027Poor
Center BLVD over San Anselmo CreekMarin3 — Serious14,000Fair
Interstate 40 over Homer WashSan Bernardino3 — Serious13,600Fair
Interstate 40 over Homer WashSan Bernardino3 — Serious13,600Fair
Interstate 40 over Crestview WashSan Bernardino3 — Serious13,600Fair
Interstate 40 over Chuckwalla WashSan Bernardino3 — Serious13,600Fair
Interstate 40 over Chuckwalla WashSan Bernardino3 — Serious13,600Fair
State Route 84 over Arroyo De La LagunaAlameda3 — Serious13,500Good
State Route 246 over Alamo Pintado CreekSanta Barbara3 — Serious13,500Fair
Las Palmas Avenue over San Joaquin RiverStanislaus3 — Serious12,585Fair
La Cadena DR over Santa Ana RiverSan Bernardino3 — Serious12,519Fair
4th ST over Auburn RavinePlacer3 — Serious12,500Fair
Phelan Road over Sheep CreekSan Bernardino3 — Serious12,199Good
Skyway RD WB over Butte CreekButte3 — Serious12,054Fair
Byron HWY over Brushy CreekContra Costa3 — Serious12,023Fair
State Route 29 over Garnett CreekNapa3 — Serious12,000Poor
Albers Road over Dry CreekStanislaus3 — Serious11,776Good
Interstate 10 WB over Palowalla DitchRiverside3 — Serious11,750Good
Interstate 10 EB over Palowalla DitchRiverside3 — Serious11,750Good
Interstate 10 WB over Mccoy WashRiverside3 — Serious11,750Fair
Interstate 10 EB over Mccoy WashRiverside3 — Serious11,750Fair
Interstate 10 WB over Gale DitchRiverside3 — Serious11,750Fair
Simpson LN over Yuba RiverYuba3 — Serious11,630Poor
SR 1 over Big Sycamore CreekVentura3 — Serious11,600Poor
Interstate 10 over Wide DitchRiverside3 — Serious11,500Good
Interstate 10 EB over Wide DitchRiverside3 — Serious11,500Good
Interstate 10 WB over Hillock DitchRiverside3 — Serious11,500Good
Interstate 10 EB over Hillock DitchRiverside3 — Serious11,500Good
Interstate 10 WB over Adair DitchRiverside3 — Serious11,500Good
Interstate 10 EB over Adair DitchRiverside3 — Serious11,500Good
Interstate 10 WB over Irolo DitchRiverside3 — Serious11,500Good
Interstate 10 WB over Three Star DitchRiverside3 — Serious11,500Good
Interstate 10 EB over Three Star DitchRiverside3 — Serious11,500Good
Monterey Road over Llagas CreekSanta Clara3 — Serious11,440Fair
Union Road over San Benito RiverSan Benito3 — Serious11,000Poor
US Highway 101 SB over Nojoqui CreekSanta Barbara3 — Serious11,000Poor
US Highway 101 NB over Nojoqui CreekSanta Barbara3 — Serious11,000Poor
State Route 29 over Saint Helena CreekLake3 — Serious10,900Good
Interstate 10 WB over Copa DitchRiverside3 — Serious10,700Good
Interstate 10 EB over Copa DitchRiverside3 — Serious10,700Good
Interstate 10 WB over Oban DitchRiverside3 — Serious10,700Good
Interstate 10 EB over Oban DitchRiverside3 — Serious10,700Good
Interstate 10 WB over Meta DitchRiverside3 — Serious10,700Good
Interstate 10 EB over Meta DitchRiverside3 — Serious10,700Good
Interstate 10 WB over Palen DitchRiverside3 — Serious10,700Good
Interstate 10 EB over Palen DitchRiverside3 — Serious10,700Good
Interstate 10 WB over Aztec DitchRiverside3 — Serious10,700Good
Interstate 10 EB over Aztec DitchRiverside3 — Serious10,700Good
Interstate 10 over Tarantula DitchRiverside3 — Serious10,700Good
Interstate 10 EB over Tarantula DitchRiverside3 — Serious10,700Good
Interstate 10 over Sutro DitchRiverside3 — Serious10,700Good
Interstate 10 EB over Sutro DitchRiverside3 — Serious10,700Fair
Interstate 10 over Alta DitchRiverside3 — Serious10,700Good
Interstate 10 EB over Alta DitchRiverside3 — Serious10,700Good
Interstate 10 over Rubble DitchRiverside3 — Serious10,700Good
Interstate 10 EB over Rubble DitchRiverside3 — Serious10,700Good
Interstate 10 over Acari DitchRiverside3 — Serious10,700Good
Interstate 10 EB over Acari DitchRiverside3 — Serious10,700Good
Interstate 10 over Beehive DitchRiverside3 — Serious10,700Good
Interstate 10 EB over Beehive DitchRiverside3 — Serious10,700Good
Interstate 10 over Esso DitchRiverside3 — Serious10,700Good
Interstate 10 EB over Esso DitchRiverside3 — Serious10,700Good
Interstate 10 over Arco DitchRiverside3 — Serious10,700Good
Interstate 10 EB over Arco DitchRiverside3 — Serious10,700Good
Interstate 10 over Mud DitchRiverside3 — Serious10,700Good
Interstate 10 EB over Mud DitchRiverside3 — Serious10,700Good
Interstate 10 over Walla DitchRiverside3 — Serious10,700Good
Interstate 10 EB over Walla DitchRiverside3 — Serious10,700Good
N. Millbrook AVE over Dry Creek CanalFresno3 — Serious10,269Good
Interstate 40 over Hacienda WashSan Bernardino3 — Serious10,150Poor
Interstate 40 over Hacienda WashSan Bernardino3 — Serious10,150Fair
Gulling Street over Middle Fork Feather RivPlumas2 — Critical10,046Poor
Verano AVE over Sonoma CreekSonoma3 — Serious9,700Good
Traffic Way over Arroyo Grande CreekSan Luis Obispo3 — Serious9,600Fair
Interstate 10 EB over Gale DitchRiverside3 — Serious9,500Fair
State Route 99 over New CreekTehama3 — Serious9,300Fair
Hellyer AVE over Coyote CreekSanta Clara3 — Serious9,275Fair
State Route 62 WB over Mission Channel OverflowRiverside3 — Serious9,000Poor
Tank Farm RD over Tank Farm DitchSan Luis Obispo3 — Serious8,803Good
Dillon Road over Whitewater RiverRiverside3 — Serious8,700Poor
Interstate 40 WB over Willow Springs WashSan Bernardino3 — Serious8,500Poor
Main ST over Morro CreekSan Luis Obispo3 — Serious8,500Fair
State Route 246 over Santa Ynez RiverSanta Barbara3 — Serious8,500Fair
Interstate 40 WB over Red WashSan Bernardino3 — Serious8,150Good
Interstate 40 EB over Red WashSan Bernardino3 — Serious8,150Good
River RD over Mark West CreekSonoma3 — Serious8,000Poor
Watt/cntr Joint Av over Dry CreekPlacer3 — Serious7,681Fair
State Route 20 over Sutter BypassSutter3 — Serious7,600Poor
Interstate 40 over Ardis DitchSan Bernardino3 — Serious7,500Poor
Interstate 40 over Ardis DitchSan Bernardino3 — Serious7,500Fair
Interstate 40 over Blind Hills WashSan Bernardino3 — Serious7,500Poor
Interstate 40 over Blind Hills WashSan Bernardino3 — Serious7,500Poor
Interstate 40 over Halfway Hills WashSan Bernardino3 — Serious7,500Fair
Interstate 40 over Black Cyn WashSan Bernardino3 — Serious7,500Poor
Interstate 40 over Black Cyn WashSan Bernardino3 — Serious7,500Poor
Interstate 40 over Newton WashSan Bernardino3 — Serious7,500Poor
Interstate 40 EB over Newton WashSan Bernardino3 — Serious7,500Poor
Interstate 40 over Mcginley WashSan Bernardino3 — Serious7,500Poor
Interstate 40 over Mcginley WashSan Bernardino3 — Serious7,500Poor
Interstate 40 over Woods WashSan Bernardino3 — Serious7,500Poor
Interstate 40 over Woods WashSan Bernardino3 — Serious7,500Poor
Interstate 40 over Tank Tower DitchSan Bernardino3 — Serious7,450Poor
Interstate 40 over Tank Tower DitchSan Bernardino3 — Serious7,450Poor
Interstate 40 over Whale Mtn WashSan Bernardino3 — Serious7,450Good
Interstate 40 over Whale Mtn WashSan Bernardino3 — Serious7,450Good
U.s. Highway 395 over Rickey Ditch OverflowMono3 — Serious6,950Good
State Route 1 SB over San Antonio CreekSanta Barbara3 — Serious6,900Good
State Route 1 NB over San Antonio CreekSanta Barbara3 — Serious6,900Fair
Lincoln Way over Dry CreekSan Joaquin3 — Serious6,877Fair
Main ST over Ventura RiverVentura2 — Critical6,853Poor
State Route 70 over Spanish CreekPlumas3 — Serious6,700Fair
Willows RD over Viejas CreekSan Diego3 — Serious6,575Good
U.s. Highway 101 over Smith Riv South Bank RDDel Norte3 — Serious6,500Fair
Horseshoe Bar RD over Secret RavinePlacer3 — Serious6,490Fair
Frazier Mtn Road over Cuddy CreekKern3 — Serious6,300Fair
County Road 102 over Cache CreekYolo3 — Serious6,200Fair
Walnut ST over Little Chico CreekButte3 — Serious6,096Fair
South AVE over Sacramento RiverTehama3 — Serious6,000Poor
E Dinuba AVE over Travers CreekFresno3 — Serious5,700Fair
State Route 211 over Eel RiverHumboldt3 — Serious5,300Fair