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Scour-Critical Bridges in Missouri

Missouri has 315 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
Is 435 S over Cst N Levee RD MissouClay3 — Serious81,653Fair
Is 44 E over Meramec Rvr Backwood DRSt. Louis3 — Serious74,368Fair
Is 44 W over Meramec Rvr South OuterSt. Louis3 — Serious37,539Poor
Is 255 N over Mississippi Rvr Up RrSt. Louis3 — Serious30,251Fair
Is 255 S over Mississippi Rvr Up RrSt. Louis3 — Serious30,251Fair
US 54 W over Missouri Rvr Up RrCallaway3 — Serious29,666Fair
US 54 E over Missouri Rvr Cst MokCole3 — Serious28,808Fair
Is 70 W over Sni-a-bar CRJackson3 — Serious28,534Fair
Is 29 N over Platte Rvr OvrflPlatte3 — Serious26,656Fair
Is 29 N over Platte RvrPlatte3 — Serious26,656Poor
Is 70 E over Sni-a-bar CRJackson3 — Serious24,233Fair
US 67 S over Missouri Rvr Bnsf RrSt. Charles3 — Serious22,278Fair
Is 29 S over Platte RvrPlatte3 — Serious18,026Fair
Is 29 S over Platte Rvr OvrflPlatte3 — Serious18,026Poor
Mo 340 E over Creve Coeur CRSt. Louis3 — Serious15,056Fair
Is 155 S over County RD MississippiPemiscot3 — Serious13,521Fair
Mo 79 S over Cuivre Rvr Crd Dyer RDLincoln3 — Serious12,712Fair
Is 29 N over Nodaway RvrAndrew3 — Serious11,937Poor
US 54 W over Moreau RvrCole3 — Serious11,836Poor
US 54 W over Moreau Rvr OverfloCole3 — Serious11,836Fair
Is 55 S over ST Johns DtchNew Madrid3 — Serious10,882Fair
Main ST over Dardenne CRSt. Charles3 — Serious10,518Fair
Is 55 N over ST Johns DtchNew Madrid3 — Serious10,439Fair
US 54 E over Moreau RvrCole3 — Serious10,305Fair
US 54 E over Moreau Rvr OverfloCole3 — Serious10,305Good
RT W S over Big RvrJefferson3 — Serious9,781Fair
US 50 E over Moreau RvrCole3 — Serious9,742Poor
US 50 W over Moreau RvrCole3 — Serious9,565Poor
US 36 E over Mussel FkLinn3 — Serious9,524Fair
Is 55 S over Saline CRPerry3 — Serious9,523Fair
Is 55 N over Saline CRPerry3 — Serious9,485Fair
Is 29 S over Nodaway RvrHolt3 — Serious9,040Fair
RT B S over Moreau RvrCole3 — Serious9,027Fair
US 54 E over Little Gravois CRMiller3 — Serious7,947Good
US 54 W over Little Gravois CRMiller3 — Serious7,933Fair
Mo 33 S over Fishing RvrClay3 — Serious6,212Good
US 169 S over 102 RvrAndrew3 — Serious6,207Fair
US 61 S over Honey CRClark3 — Serious6,177Fair
RT T E over Portage ByuNew Madrid3 — Serious6,067Fair
Mo 53 S over Drain Dtch No 1Butler3 — Serious5,914Fair
US 65 S over Crooked CRLivingston3 — Serious5,858Fair
US 412 E over Pole Cat SluDunklin3 — Serious5,768Fair
US 63 S over Gasconade RvrMaries3 — Serious5,331Fair
US 36 E over Castile CRDeKalb3 — Serious5,231Fair
US 50 E over Lamine RvrMorgan3 — Serious5,190Fair
US 36 W over Mid Fk Chariton RvMacon3 — Serious5,085Fair
US 65 S over Muddy CRPettis3 — Serious4,743Fair
US 65 N over Muddy CRPettis3 — Serious4,734Good
US 36 W over Blackwell CRLivingston3 — Serious4,527Fair
Bu 61 S over Ramsey CRScott3 — Serious4,514Fair
RT C E over Moreau RvrCole3 — Serious4,478Fair
US 36 E over Blackwell CRLivingston3 — Serious4,457Fair
Mo 25 S over Wolf CRStoddard3 — Serious4,191Fair
Mo 25 S over Br Wolf CRStoddard3 — Serious4,191Fair
US 65 S over No CRLivingston3 — Serious4,053Fair
US 65 S over Grand RvrLivingston3 — Serious3,860Fair
Mo 51 S over Kaskaskia ST MississiPerry3 — Serious3,806Poor
Mo 51 S over Horse Island ChutePerry3 — Serious3,806Poor
US 65 S over Honey CR Drain DtcGrundy3 — Serious3,670Fair
US 24 E over Fire Prairie CRJackson3 — Serious3,602Poor
Mo 34 E over Clark CRWayne3 — Serious3,308Poor
RT B S over Osage RvrCole3 — Serious3,285Poor
Old HWY 21 S over Sandy CRJefferson3 — Serious3,266Fair
Mo 89 S over Gasconade RvrOsage3 — Serious2,822Fair
RT Z E over Hubble CRCape Girardeau3 — Serious2,729Poor
RT Z E over Hubble CR OvrflCape Girardeau3 — Serious2,729Poor
US 50 E over Gasconade RvrGasconade3 — Serious2,422Poor
Polla Rd. over Roubidoux CRPulaski3 — Serious2,400Good
US 136 E over Missouri Rvr AbandonedAtchison3 — Serious2,100Poor
Mo 87 S over Clarks Fork CRCooper3 — Serious1,949Fair
US 24 E over Grand RvrCarroll3 — Serious1,938Poor
US 136 E over Weldon Fk Of GrandMercer3 — Serious1,917Fair
RT Oo E over Whitewater RvrCape Girardeau3 — Serious1,914Fair
US 65 S over Mound CRCarroll3 — Serious1,892Fair
RT D E over Tuque & Wolf CRWarren3 — Serious1,836Poor
RT E E over Montgomery BrSullivan3 — Serious1,700Fair
RT E E over Locust CRSullivan3 — Serious1,700Fair
RT Y E over Fourche CRSte. Genevieve3 — Serious1,583Fair
RT Ee S over Smith BrDeKalb3 — Serious1,564Fair
RT A S over N Fk Mud CRCaldwell3 — Serious1,529Fair
RT W E over Goodwin Rvr BrLaclede3 — Serious1,389Fair
US 160 E over Piney CROregon3 — Serious1,346Fair
RT C S over Apple CRPerry3 — Serious1,265Fair
Mo 151 S over Goodwater BrAudrain3 — Serious1,259Poor
US 136 E over Mill CRNodaway3 — Serious1,230Good
RT E S over Barker CRBenton3 — Serious1,120Poor
E. Gate Road over Big Piney RiverPulaski3 — Serious1,105Good
Mo 41 S over Missouri RvrCarroll3 — Serious1,096Good
Mo 153 S over Drain Dtch #3New Madrid3 — Serious1,095Fair
Mo 142 E over Harris CRRipley3 — Serious1,033Poor
Mo 5 S over Puzzle CRChariton3 — Serious1,021Fair
RT K S over S Grand RvrHenry3 — Serious1,021Poor
Mo 87 S over Moniteau CRMoniteau3 — Serious1,013Fair
Mo 162 E over Drain Dtch #3New Madrid3 — Serious1,012Fair
Park Access RD over Bennett Spr BrDallas3 — Serious1,000Poor
RT Z E over Platte RvrPlatte3 — Serious958Poor
RT W S over Long BrAndrew3 — Serious940Fair
RT Aa S over Doe Run CRSt. Francois3 — Serious935Fair
Richfield RD over Rush CRClay3 — Serious900Poor
US 169 S over Linn CRGentry3 — Serious892Good
RT D E over Drain Dtch #2New Madrid3 — Serious867Fair
Mo 81 S over Honey CRClark3 — Serious832Fair
Mo 13 S over Hickory CRDaviess3 — Serious772Fair
Mo 48 E over 3rd Fk Platte RvrGentry3 — Serious766Poor
Mo 5 S over Br Of Locust CRLinn3 — Serious765Fair
RT W S over W Fk Big CRHarrison3 — Serious732Fair
Mo 142 E over Bennett BayOzark3 — Serious662Fair
Mo 34 E over Bear CRWayne3 — Serious630Fair
Mo 129 S over Chariton RvrChariton3 — Serious613Fair
RT P S over CreekAudrain3 — Serious608Fair
US 169 S over Mid Fk Grand RvrGentry3 — Serious601Fair
RT U E over 102 RvrNodaway3 — Serious598Fair
RT V S over Linn CreekCamden3 — Serious575Poor
Mo 87 S over Richland CRHoward3 — Serious560Fair
RT K E over Weldon Fk Of GrandMercer3 — Serious555Fair
RT M S over Snail CRJohnson3 — Serious552Poor
RT Bb E over ST Francis RvrDunklin3 — Serious505Fair
RT Bb E over ST Francis RvrDunklin3 — Serious505Fair
RT C S over Panther CRGentry3 — Serious494Fair
RT K E over Loutre RvrMontgomery3 — Serious490Poor
RT K E over Dry Fork CRMontgomery3 — Serious490Poor
Farm RD 173 over Br Of N Dry Sac RvGreene3 — Serious487Poor
RT K S over Blackwater RvrCooper3 — Serious479Fair
Garland AVE over Dry Fk Fishing RvrClay3 — Serious450Poor
RT A S over S Fk Mud CRCaldwell3 — Serious415Fair
RT F E over Gees CRGrundy3 — Serious388Fair
Mo 3 S over Silver CRRandolph3 — Serious375Fair
RT E E over Medicine CreekSullivan3 — Serious373Good
Mo 3 S over Muncas CRRandolph3 — Serious363Good
RT C S over 102 RvrAndrew3 — Serious347Fair
RT B S over Zounds CRGentry3 — Serious331Poor
RT Cc S over Burris CR FkMoniteau3 — Serious314Fair
RT U E over Bear CRScotland3 — Serious312Good
RT E E over W Honey CRMercer3 — Serious309Poor
RT J E over Mid Fk Chariton RvMacon3 — Serious302Fair
Joplin AVE over Trib Of Center CRJasper3 — Serious300Poor
Johnston RD over Sandy CRJefferson3 — Serious300Fair
RT U S over Sights BrLinn3 — Serious298Fair
RT Kk E over Muddy CRLivingston3 — Serious289Fair
RT Kk E over Lit Muddy CRLivingston3 — Serious289Fair
RT Uu E over Big CRCarroll3 — Serious273Fair
Old 210 HWY over Rush CRClay3 — Serious267Poor
RT V S over Castor RvrStoddard3 — Serious266Fair
RT B E over Muddy CRGrundy3 — Serious260Poor
RT M E over Bridge CRCarroll3 — Serious256Fair
RT Dd E over Lake CRPettis3 — Serious238Good
RT K S over N Fk Crooked CRLivingston3 — Serious227Poor
178th ST over New Hope CRClay3 — Serious216Poor
RT Ww E over Brush CRMacon3 — Serious213Fair
RT M E over Mud CRStoddard3 — Serious198Fair
RT Mm E over W Fk Locust CRSullivan3 — Serious196Fair
RT Jj S over Wakenda CRCarroll3 — Serious185Fair
RT C S over Bear CRWayne3 — Serious183Fair
RT O E over Jones BrChariton3 — Serious180Poor
Big Indian Crk RD over Indian CRFranklin3 — Serious180Fair
RT P E over Spillway DtchNew Madrid3 — Serious167Fair
RT Bb E over Br Of Weldon Fk CRMercer3 — Serious166Fair
RT D E over Sandy CRMercer3 — Serious163Fair
RT H S over Long Br CRGentry3 — Serious154Fair
RT F S over Crooked CRDeKalb3 — Serious153Fair
Golf Crse RD Flw26 over Big Piney RiverPulaski3 — Serious150Fair
RT K S over Medicine CRLivingston3 — Serious147Fair
RT N E over Fork Pine CROzark3 — Serious142Poor
RT An S over Red Oak CRFranklin3 — Serious121Fair
Co RD SW 801 over Trib Of Big CRJohnson3 — Serious110Poor
RT Oo S over Turkey CRWayne3 — Serious106Fair
RT Y S over N Blackbird CRPutnam3 — Serious104Fair
RT D E over Spring CRSullivan3 — Serious102Fair
Fortune RD over Jenkins CRNodaway3 — Serious100Poor
Fortune RD over Trib Of Jenkins CRNodaway3 — Serious100Poor
Daniels ST over CreekWayne3 — Serious100Poor
RT Hh E over Baileys CROsage3 — Serious98Poor
RT B E over Clear CRNodaway3 — Serious97Fair
RT U E over Otter CRCaldwell3 — Serious92Good
RT Vv E over Long BrNodaway3 — Serious89Fair
RT Vv E over Platte RvrNodaway3 — Serious89Poor
County RD 1230 over Hemphill BrLawrence3 — Serious60Poor
Prospect AVE over Br Of Massey CRCass3 — Serious50Poor
285 TH ST over W Fk Of Grand RvrGentry3 — Serious50Poor
E 165 ST over E Fk Big CRHarrison3 — Serious50Poor
County RD 2110 over Dry HollowLawrence3 — Serious50Poor
County RD 430 over Mound CRLivingston3 — Serious50Poor
Katy RD over Slaughter BrNodaway3 — Serious50Poor
County RD 906 over Ratford BrReynolds3 — Serious50Poor
County RD 206 over Taum Sauk CRReynolds3 — Serious50Poor
Buena Vista RD over Trib Of Roark CRTaney3 — Serious50Poor
Beach RD over Givins BrWebster3 — Serious50Poor
Camp Branch RD over Br Of Crooked CRCass3 — Serious45Poor
Co RD NW 575 over Walnut CRJohnson3 — Serious45Poor
County Road 320 over Drain DtchCarroll3 — Serious40Poor
Co RD NE 671 over Mulkey CRJohnson2 — Critical40Poor
Co RD SW 301 over E Fk Post Oak CRJohnson3 — Serious40Poor
Elk RD over Nelson CRLaclede3 — Serious40Poor
County RD 1207 over Turnback CRLawrence3 — Serious40Poor
County RD 7460 over Lit Piney CRPhelps3 — Serious40Poor
Route Ub over Trib To Roubidoux CrkPulaski3 — Serious40Fair
RT Tt E over Slough CRSaline3 — Serious40Fair
River RD over Locust CRSullivan1 — Imminent failure40Poor
Goose Creek RD over Indian CRWashington0 — Bridge closed40Poor
County RD 534 over Hawker CRBollinger3 — Serious35Poor