Scour-Critical Bridges in Arizona

Arizona has 162 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
Cactus Road over Indian Bend WashMaricopa3 — Serious57,843Fair
Indian School Road over Grand CanalMaricopa3 — Serious52,404Fair
Thunderbird Road over Cave CreekMaricopa3 — Serious40,125Fair
Shea Boulevard over Indian Bend WashMaricopa3 — Serious37,601Poor
Bell Road over Cave CreekMaricopa3 — Serious36,376Fair
Laughlin RD Br over Colorado RiverMohave3 — Serious31,500Fair
Tatum Boulevard over Indian Bend WashMaricopa3 — Serious31,074Fair
SR 77; NB & SB over Rillito CreekPima3 — Serious31,053Fair
15th Avenue over Grand CanalMaricopa3 — Serious23,182Fair
N Flowing Wells RD over Rillito RiverPima3 — Serious22,976Fair
19th AVE over Cave CreekMaricopa3 — Serious20,381Fair
River Road over Ventana WashPima3 — Serious17,470Fair
56th Street over Arizona CanalMaricopa3 — Serious13,080Fair
Nogales HWY over Santa Cruz RiverPima3 — Serious11,577Fair
IRR SR 87 over Pima Lateral CanalPinal3 — Serious11,494Fair
Nogales HWY over Lee Moore WashPima3 — Serious11,193Fair
IRR SR 87 over Mcclellan WashPinal3 — Serious10,511Fair
IRR SR 87 over Santa Cruz WashPinal3 — Serious10,511Fair
Rio Rico Drive over Santa Cruz RiverSanta Cruz3 — Serious10,449Fair
US 93 over Cane Springs WashMohave3 — Serious10,203Fair
US 93 over Natural Corral WashMohave3 — Serious10,203Fair
W Gurley ST over Granite CreekYavapai3 — Serious9,396Fair
US 93 NB over Detrital WashMohave3 — Serious8,908Fair
US 93 SB over Detrital WashMohave3 — Serious8,855Fair
SR 260; Fas 326 over Wilbur CanyonYavapai3 — Serious8,346Fair
Sunrise Drive over Ventana WashPima3 — Serious7,758Fair
Willis Street over Granite CreekYavapai3 — Serious7,000Fair
Old Nogales HWY over Small WashPima3 — Serious6,995Fair
Old Nogales HWY over Small WashPima3 — Serious6,968Fair
US 70 over San Simon RiverGraham3 — Serious6,912Fair
Ruby Road over Potrero CreekSanta Cruz3 — Serious6,783Fair
SR 260 over Cherry CreekYavapai3 — Serious6,709Good
SR 74 over Agua Fria RiverMaricopa3 — Serious6,675Fair
Montezuma Castl RD over Verde RiverYavapai3 — Serious6,328Fair
SR 80 over San Pedro RiverCochise3 — Serious6,156Poor
Avra Valley Road over E Branch Brawley WashPima3 — Serious5,668Fair
IRR US 70 over Cottonwood WashGraham3 — Serious5,460Fair
Dodge BLVD over Rillito CreekPima3 — Serious5,205Fair
US 191 NB over Niger CanyonGreenlee3 — Serious5,190Fair
Jesse Hayes RD over Pinal CreekGila3 — Serious5,162Poor
Montezuma Avenue over Wet Beaver CreekYavapai3 — Serious4,800Good
Broad Street over Pinal CreekGila3 — Serious4,750Good
US 160 over Church Rock WashNavajo3 — Serious4,533Fair
SR 80 over Stronghold WashCochise3 — Serious4,308Fair
SR 80 over Dry WashCochise3 — Serious4,308Fair
SR 80 over Dry WashCochise3 — Serious4,083Fair
SR 87 over WashPinal3 — Serious3,947Good
IRR US 70 over Patterson WashGraham3 — Serious3,757Fair
Avenue 7e over Gila RiverYuma3 — Serious3,688Good
SR 77 over Mammoth WashPinal3 — Serious3,653Fair
Trico Road over Brawley WashPima3 — Serious3,531Poor
IRR US 70 over Fine WashGraham3 — Serious3,521Fair
Pinal View Drive over Icehouse CanyonGila3 — Serious3,504Good
S Frontage RD over Fortuna WashYuma3 — Serious3,375Fair
IRR US 70 over Dry WashGraham3 — Serious2,940Fair
IRR SR 95 over Climas WashLa Paz3 — Serious2,912Fair
US 191 over Stockton WashGraham3 — Serious2,901Fair
SR 72 over Butler WashLa Paz3 — Serious2,725Good
Trico-marana Road over Santa Cruz RiverPima3 — Serious2,718Poor
SR 77 over Dodson WashPinal3 — Serious2,525Fair
SR 77 over WashPinal3 — Serious2,525Fair
SR 77 over Roach WashPinal3 — Serious2,525Fair
SR 83 over Gardner CanyonPima3 — Serious2,488Fair
SR 77 over Zapata WashPinal3 — Serious2,421Fair
SR 77 over San Pedro RiverPinal3 — Serious2,411Fair
IRR SR 87 over Coyote WashNavajo3 — Serious2,376Fair
Old US 80 over Ligurta WashYuma3 — Serious2,302Fair
Old US 80 over Dry WashYuma3 — Serious2,302Good
SR 77 over Eskiminzin WashPinal3 — Serious2,301Fair
SR 82 over Hog CanyonSanta Cruz3 — Serious2,234Fair
SR 82 over Adobe WashSanta Cruz3 — Serious2,234Fair
US 60 over WashMaricopa3 — Serious2,097Good
Old Black Cyn HWY over Agua Fria RiverYavapai3 — Serious2,083Fair
IRR BIA RTE N15 over Black Canyon WashNavajo2 — Critical2,051Poor
SR 82; Fas 275 over Rain Valley WashCochise3 — Serious1,940Fair
SR 80 over Government DrawCochise3 — Serious1,843Fair
IRR SR 85; Fap 075 over Rio Cornez WashPima3 — Serious1,641Fair
IRR SR 85; Fap 075 over Midway WashMaricopa3 — Serious1,625Fair
5th ST over Robb WashPima3 — Serious1,519Fair
IRR SR 85; Fap 075 over Gunsight WashPima3 — Serious1,498Fair
SR 188 over Roosevelt LakeGila3 — Serious1,447Good
Madera Canyon RD over Medium WashPima3 — Serious1,200Poor
Madera Canyon RD over Florida Canyon WashPima3 — Serious1,200Poor
SR 188 over Campaign CreekGila3 — Serious1,130Fair
SR 188 over Bumblebee CreekGila3 — Serious1,042Good
Sr188 over Ash CreekGila3 — Serious1,042Good
SR 188 over Rock CreekGila3 — Serious1,042Good
94th Street over Drain ChannelMaricopa3 — Serious1,010Fair
Downing-olson DR over Drain ChannelMaricopa3 — Serious1,010Fair
Anderson RD over Santa Cruz RiverPinal3 — Serious1,005Fair
Douglas Road over Mule GulchCochise3 — Serious1,000Poor
W Produce Row over Nogales WashSanta Cruz3 — Serious1,000Fair
US 180 over Little Colorado RiverNavajo3 — Serious876Fair
Trico RD over Santa Cruz RiverPima3 — Serious871Poor
River Road over Santa Cruz RiverSanta Cruz3 — Serious840Fair
Silverbell RD over Blanco WashPima3 — Serious816Poor
Wards Canyon RD over Soap Box CanyonGreenlee3 — Serious800Poor
Mile Wide Road over Brawley WashPima3 — Serious794Fair
Mile Wide Road over Jones WashPima3 — Serious794Fair
Marsh Station RD over La Cienega WashPima3 — Serious627Fair
Hereford Road over WashCochise3 — Serious620Fair
High Street over Copper GulchGila3 — Serious620Fair
Old SR 76 over San Pedro RiverPima3 — Serious620Fair
SR 76 over Redfield CanyonPima3 — Serious530Fair
IRR Old US 66 over Querino CanyonApache3 — Serious500Poor
Purdy Lane over Green Bush DrawCochise3 — Serious500Fair
Warren Road over Greenbush DrawCochise3 — Serious500Fair
SR B 10 over WaterwayCochise3 — Serious482Good
SR 96; Fas 370 over Santa Maria RiverYavapai3 — Serious453Fair
Old US 80 over WashYuma3 — Serious448Fair
US 180 over Beaver Dam WashApache3 — Serious418Fair
US 180 over Little Colorado RiverApache3 — Serious418Fair
Zorrilla Street over San Francisco RiverGreenlee3 — Serious415Fair
Shumway RD over Silver CreekNavajo3 — Serious400Fair
Pima Street over Blowout WashYavapai3 — Serious381Fair
IRR SR 261 over Little Colorado RiverApache3 — Serious378Fair
Portal Road over San Simon RiverCochise3 — Serious350Fair
Old Blk Canyon HWY over Green GulchYavapai3 — Serious330Fair
SR 88 over Davis WashMaricopa3 — Serious321Fair
IRR SR 286; Fas 31 over Bailey WashPima3 — Serious316Fair
Andrews Road over Huachuca Canyon CreekCochise3 — Serious300Poor
Co. 74-old Blk Cyn over Hackberry CreekYavapai3 — Serious248Good
N Mt Lemmon Short over Small WashPima3 — Serious246Fair
Fairgrounds RD over Packer WashGreenlee3 — Serious225Fair
Queen Creek Drive over Queen CreekPinal3 — Serious210Fair
Telera ST (ajo) over Ajo WashPima3 — Serious200Poor
Greaterville Road over Medium WashPima3 — Serious200Fair
Tuzigoot Approach over Verde RiverYavapai3 — Serious200Fair
Steven Loop over Medium WashGreenlee3 — Serious188Fair
Steven Loop over Waters WashGreenlee3 — Serious188Fair
Lees Ferry Road over Paria RiverCoconino3 — Serious177Fair
Obed RD over Little Colorado RiverNavajo3 — Serious160Good
County RD 3144 over Bonita WashApache3 — Serious150Fair
IRR BIA RTE N6486 over Laguna CreekNavajo2 — Critical150Poor
El Camino Viejo over Sand Tanks WashPinal3 — Serious132Fair
Geronimo Trail over Silver CreekCochise3 — Serious100Fair
Geronimo Trail over Black DrawCochise3 — Serious100Fair
Dickison DR over Pinal CreekGila3 — Serious100Fair
Steven Loop over Goat Camp CanyonGreenlee3 — Serious92Fair
Geronimo Trail over Cottonwood WashCochise3 — Serious75Fair
Ray Junction RD over WashPinal3 — Serious67Fair
Paradise-portal RD over Turkey CreekCochise3 — Serious60Fair
Paradise-portal RD over Silver CreekCochise3 — Serious60Fair
I-40; Sfr over Ltl Lithodendron WashNavajo3 — Serious60Poor
Date Creek RD over WashYavapai3 — Serious60Fair
4010: Haekel Road over Slick Rock WashGraham3 — Serious50Good
4010: Haekel Road over Upper San Simon DrainageGraham3 — Serious50Fair
Bhbcb over Gila RiverGreenlee3 — Serious50Fair
Hooper Ranch RD over Little Colorado RiverApache3 — Serious40Poor
Geronimo Trail over Sycamore CreekCochise3 — Serious40Fair
SR 79 over Foreman WashPinal3 — Serious35Fair
Blue Riv Rd-fr 281 over Turkey CreekGreenlee3 — Serious30Fair
Blue Riv Rd-fr 281 over WashGreenlee3 — Serious30Fair
Blue Riv Rd-fr 281 over Box Canyon WashGreenlee3 — Serious30Fair
Blue Riv Rd-fr 281 over Blue RiverGreenlee3 — Serious30Good
Blue Riv Rd-fr 281 over Blue RiverGreenlee3 — Serious30Fair
Blue Riv Rd-fr 281 over Blue RiverGreenlee3 — Serious30Fair
Blue Riv Rd-fr 281 over Johnson CanyonGreenlee3 — Serious30Fair
Blue Riv Rd-fr 281 over WashGreenlee3 — Serious30Fair
Blue Riv Rd-fr 281 over Mother Hubbard CreekGreenlee3 — Serious30Fair
Leslie Canyon RD over Leslie CreekCochise3 — Serious29Fair
IRR BIA RTE 9 over Black RiverGila3 — Serious5Poor