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Scour-Critical Bridges in Colorado

Colorado has 241 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
Ramp To SH 121 Ml over Clear Creek RJefferson3 — Serious92,000Good
US 85 Ml over Big Dry CreekArapahoe3 — Serious62,000Fair
NB Ramp To I70/i76 over Clear Creek RJefferson3 — Serious59,000Fair
Ramp To I 25 Nbnd over Fountain CreekEl Paso3 — Serious56,500Good
I 270 Ml Ebnd over South Platte RiverAdams3 — Serious48,500Poor
US 24 Bypass over I 25 Ml Fountain CrkEl Paso3 — Serious47,000Fair
Ramp To I 70 Ebnd over Clear Creek Bp RJefferson3 — Serious46,000Fair
SH 121 Ml over Clear CreekJefferson3 — Serious38,000Fair
SH 95 Ml over Clear CreekAdams3 — Serious37,000Fair
US 287 Ml over Spring CreekLarimer3 — Serious33,000Fair
SH 177 Ml over Little Dry CreekArapahoe3 — Serious29,000Poor
US 285 Ml over North Turkey CreekJefferson3 — Serious26,000Fair
Dry Creek Road over Big Dry CreekArapahoe3 — Serious24,040Fair
US 85 Ml over Fountain CreekEl Paso3 — Serious22,000Poor
Taft Hill Rd(cr17) over Big Thompson RiverLarimer3 — Serious21,217Fair
Woodmen Road over Monument CreekEl Paso3 — Serious21,121Fair
Academy BLVD SB over Fountain CreekEl Paso3 — Serious18,073Fair
US 36 Ml Wbnd over Boulder CreekBoulder3 — Serious18,000Poor
US 36 Ml Ebnd over Boulder CreekBoulder3 — Serious18,000Fair
I 70 Ml over Plateau CreekMesa3 — Serious17,000Fair
Ramp (wb) To SH 65 over Plateau Creek RMesa3 — Serious17,000Fair
Railroad Av over Colorado RiverGarfield3 — Serious16,434Fair
US 36 Ml over Four Mile Canyon CreekBoulder3 — Serious16,000Fair
SH 7 Ml Wbnd over Boulder CreekBoulder3 — Serious15,000Poor
Palmer Park BLVD over Sand CreekEl Paso3 — Serious13,644Fair
Mulberry Street over Larimer Co. Canal No. 2Larimer3 — Serious12,947Fair
US 85 Ml over Fountain CreekEl Paso3 — Serious11,000Poor
South Lemay Avenue over Fossil CreekLarimer3 — Serious10,956Fair
Kipling Street over Farmers Highline CanalJefferson3 — Serious9,958Fair
US 50 Ml over Beaver CreekFremont3 — Serious9,800Fair
SH 340 Ml Ebnd over Colorado RiverMesa3 — Serious9,500Fair
Irr# US 550 Ml over Animas RiverLa Plata3 — Serious8,100Fair
County Road 300 over Colorado RiverGarfield3 — Serious8,096Fair
US 6 Ml over Clear CreekJefferson3 — Serious7,500Fair
SH 65 Ml over Gunnison RiverDelta3 — Serious7,000Fair
US 50 Ml Wbnd over Brush Hollow CreekFremont3 — Serious7,000Fair
I 25 Ml Sbnd over Huerfano RiverHuerfano3 — Serious7,000Fair
SH 115 Ml over Coal CreekFremont3 — Serious6,600Fair
La Crosse AVE over Arkansas RiverPueblo3 — Serious6,509Fair
US 50 Ml Ebnd over Gunnison RiverDelta3 — Serious6,500Fair
US 50 Ml over Gunnison RiverGunnison3 — Serious6,200Fair
I 70 Ml Wbnd over Little Salt WashMesa3 — Serious5,500Fair
I 70 Ml Ebnd over Little Salt WashMesa3 — Serious5,500Fair
I 70 Ml Wbnd over Big Salt WashMesa3 — Serious5,500Fair
I 70 Ml Ebnd over Big Salt WashMesa3 — Serious5,500Fair
Baxter Rd. over Arkansas RiverPueblo3 — Serious5,240Fair
I 25 Ml Nbnd over Bear CreekHuerfano3 — Serious5,000Fair
I 25 Ml Sbnd over Bear CreekHuerfano3 — Serious5,000Fair
US 50 Ml Ebnd over Turkey CreekPueblo3 — Serious4,900Fair
US 50 Ebnd over Arkansas RiverProwers3 — Serious4,700Fair
SH 131 Ml over Yampa RiverRoutt3 — Serious4,600Good
SH 115 Ml over Arkansas RiverFremont3 — Serious4,500Fair
US 50 Ml over King ArroyoOtero3 — Serious4,500Fair
Alkire Street over Farmers Highline CanalJefferson3 — Serious4,326Fair
US 40 Ml over Yampa RiverRoutt3 — Serious4,200Fair
Rockwell Street over Big Thompson RiverLarimer3 — Serious4,139Fair
US 50 Ml over Arkansas RiverPueblo3 — Serious4,100Fair
Grant Street over Local DrainageAdams3 — Serious4,074Good
26th Street over Fountain CreekEl Paso3 — Serious4,005Fair
Irr# US 491 Ml over Mancos RiverMontezuma3 — Serious4,000Fair
Irr# US 491 Ml over Indian CreekMontezuma3 — Serious4,000Fair
SH 96 Ml over Blue Ribbon ArroyoPueblo3 — Serious4,000Fair
Third Street over Anderson ArroyoOtero3 — Serious3,981Poor
US 287 Ml over Draw Cattle UnderpassLarimer3 — Serious3,900Fair
Willamette AVE over Shooks RunEl Paso3 — Serious3,894Fair
US 287 Ml over Big Sandy CreekCheyenne3 — Serious3,800Fair
US 285 Ml over Conejos Riv.overflowConejos3 — Serious3,200Poor
US 285 Ml over Conejos RiverConejos3 — Serious3,200Fair
74th Avenue over Farmers Highline CanalJefferson3 — Serious3,182Fair
US 24 Ml over DrawEl Paso3 — Serious3,000Fair
Fairway Lane over Dutch CreekArapahoe3 — Serious2,996Fair
County Road 1 over Hay CreekTeller3 — Serious2,901Fair
US 34 Ml over Surveyor CreekWashington3 — Serious2,900Fair
US 24 Ml over East Fork Arkansas RiverLake3 — Serious2,700Good
SH 105 Ml over DrawDouglas3 — Serious2,600Poor
SH 348 Ml over Uncompahgre RiverMontrose3 — Serious2,600Fair
County Road 108 over Crystal RiverGarfield3 — Serious2,569Fair
US 50 Ml over Bakers GulchFremont3 — Serious2,500Fair
County Road 54 over South Platte RiverWeld3 — Serious2,391Fair
Riverdale Road over Todd CreekAdams3 — Serious2,323Fair
SH 109 Ml over DrawOtero3 — Serious2,300Poor
SH 9 Ml over Middle Fk S.platte RvrPark3 — Serious2,300Fair
Grand Avenue over North Fork Gunnison RvrDelta3 — Serious2,165Fair
County Road 20 over Dry CreekLarimer3 — Serious2,122Fair
SH 14 Ml over Cache La Poudre RiverLarimer3 — Serious2,100Good
US 385 Ml over Frenchman CreekPhillips3 — Serious1,900Fair
SH 69 Ml over Texas CreekCuster3 — Serious1,800Fair
SH 69 Ml over Taylor CreekCuster3 — Serious1,800Good
SH 69 Ml over Grape CreekCuster3 — Serious1,800Fair
Havana Street over Obrian CanalAdams3 — Serious1,788Fair
Jackson Street over N. Fork Republican RiverYuma3 — Serious1,702Fair
SH 231 Ml over Arkansas RiverPueblo3 — Serious1,700Fair
Ramona Avenue over Cheyenne CreekEl Paso3 — Serious1,659Fair
SH 131 Ml over Up Rr Colorado RiverEagle3 — Serious1,600Fair
SH 330 Ml over Big CreekMesa3 — Serious1,600Fair
US 385 Ml over South Platte RiverSedgwick3 — Serious1,600Fair
US 385 Ml over South Platte RiverSedgwick3 — Serious1,600Fair
US 385 Ml over South Platte RiverSedgwick3 — Serious1,600Fair
SH 12 Ml over Burro RiverLas Animas3 — Serious1,500Fair
US 6 Ml over Frenchman CreekPhillips3 — Serious1,500Poor
County Road 74 over Upper Bear Creek | UpperJefferson3 — Serious1,436Fair
County Road 74 | U over Upper Bear CreekJefferson3 — Serious1,308Fair
Cheyenne Canyon RD over North Cheyenne CreekEl Paso3 — Serious1,202Fair
US 40 Ml over Eureka CreekCheyenne3 — Serious1,200Fair
SH 113 Ml over Lewis CreekLogan3 — Serious1,100Fair
SH 113 Ml over DrawLogan3 — Serious1,100Fair
County Road 74 | U over Upper Bear CreekJefferson3 — Serious1,066Fair
US 385 Ml over Sand CreekKit Carson3 — Serious1,000Fair
Bijou Street over Shooks RunEl Paso3 — Serious932Poor
SH 133 Ml over East Muddy CreekGunnison3 — Serious930Fair
Entrance And Exit over S Branch Hyland CreekJefferson3 — Serious919Good
I 70 Frontage RD over Clear Creek SRClear Creek3 — Serious917Poor
Main Gore Drive over Gore CreekEagle3 — Serious869Fair
SH 120 Ml over Cockelburr CreekFremont3 — Serious800Fair
SH 371 Ml over Alamosa RiverConejos3 — Serious790Fair
Taylor Street over Eagle RiverEagle3 — Serious748Fair
West Gate Road over S Boulder Diversion CanaJefferson3 — Serious740Fair
US 385 Ml over Black Wolf CreekYuma3 — Serious720Fair
Lions Gate Drive over Vasquez CreekGrand3 — Serious703Good
SH 52 Ml over Rock CreekMorgan3 — Serious650Fair
Greene Street over Cement CreekSan Juan3 — Serious647Poor
Jackson Creek Road over West Plum CreekDouglas3 — Serious644Fair
SH 71 Ml over DrawMorgan3 — Serious640Fair
I 70 Access RD over Colorado River ArGarfield3 — Serious611Fair
SH 149 Ml over Cebolla CreekGunnison3 — Serious560Fair
SH 149 Ml over Lake Fk Gunnison RiverGunnison3 — Serious560Fair
SH 141 Ml over Dry CreekMontrose3 — Serious560Fair
SH 141 Ml over Gunnison RiverMesa3 — Serious540Fair
SH 141 Ml over Dolores RiverMesa3 — Serious540Fair
SH 12 Ml over S Fk Purgatoire RiverLas Animas3 — Serious520Fair
SH 12 Ml over DrawLas Animas3 — Serious520Poor
Hamilton Creek RD over Blue RiverSummit3 — Serious483Fair
Poncha Springs LN over South Arkansas RiverChaffee3 — Serious475Good
Hyland Greens Pl over Farmers Highline CanalAdams3 — Serious452Fair
County Road 37 over Cedar CreekLogan3 — Serious434Good
US 160 Ml over DrawBaca3 — Serious420Poor
CR 906 (buckhorn) over Uncompahgre RiverOuray3 — Serious402Fair
SH 10 Ml over Cucharas RiverHuerfano3 — Serious390Fair
SH 59 Ml over E Spring Creek Trib.Kit Carson3 — Serious380Fair
County Road 162 over Baldwin CreekChaffee3 — Serious371Fair
SH 96 Ml over Horse CreekCrowley3 — Serious340Fair
County Road X over Saguache CreekSaguache3 — Serious335Fair
Stage Coach over Little Thompson RiverLarimer3 — Serious331Good
US 350 Ml over Crooked ArroyoOtero3 — Serious320Fair
County Road 38 over E. Bijou CreekArapahoe3 — Serious315Fair
Soda Lakes Road over Bear CreekJefferson3 — Serious291Poor
CR J25 (fairview) over Tongue CreekDelta3 — Serious267Poor
SH 141 Ml over John Brown CreekMesa3 — Serious260Fair
SH 141 Ml over Dolores RiverMontrose3 — Serious260Fair
County Road R13 over Dolores RiverMontrose3 — Serious253Fair
SH 59 Ml over Coyote CreekYuma3 — Serious240Poor
SH 59 Ml over Six Mile CreekPhillips3 — Serious220Poor
US 160 Ml over DrawBaca3 — Serious200Fair
US 160 Ml over DrawBaca3 — Serious200Fair
SH 165 Ml over South Hardscrabble CreekCuster3 — Serious200Fair
Nfsr 96 over So. Platte RiverPark2 — Critical200Poor
County Road 41 over N. Fork Michigan RiverJackson3 — Serious184Fair
Co CR 96 over South Platte RiverJefferson3 — Serious166Fair
Evans Road over West Kiowa CreekEl Paso3 — Serious165Fair
Begonia Rd/cr 18 over Dry CreekMontrose3 — Serious160Fair
US 160 Ml over Vachita CreekLas Animas3 — Serious150Fair
County Road Kk over Buffalo CreekProwers3 — Serious147Fair
Corwina Park Road over Bear CreekJefferson3 — Serious146Fair
County Road Mm over Pleasant Valley DrainProwers3 — Serious141Poor
SH 142 Ml over Rio GrandeConejos3 — Serious130Good
US 160 Ml over Tobe CreekLas Animas3 — Serious130Fair
US 160 Ml over Chacuaco CreekLas Animas3 — Serious130Fair
County RD 34 over First CreekArapahoe3 — Serious129Fair
Wykagyl RD over Lapin CreekCuster3 — Serious127Fair
County Road 84w over North St. Vrain CreekBoulder3 — Serious122Fair
County RD 41.7 over Sarcillo Canyon CreekLas Animas3 — Serious122Fair
SH 300 Ml over Lake Fork CreekLake3 — Serious120Poor
Governor Basin RD over Sneffels CreekOuray3 — Serious120Fair
Shady Lane over Bear CreekJefferson3 — Serious117Fair
SH 116 Ml over Beaty CreekBaca3 — Serious110Poor
County Road 162 over East Bijou CreekElbert3 — Serious105Fair
County Road 6 over Alamosa RiverConejos3 — Serious102Poor
County Road 103 over Laramie RiverLarimer3 — Serious95Fair
County Road 70 over Morgan CreekRoutt3 — Serious90Fair
County Road 42 over Wolf CreekArapahoe3 — Serious87Fair
County Road 63e over S Frk Cache La Poudre RvLarimer3 — Serious86Fair
County Road 63e over Little Beaver CreekLarimer3 — Serious86Poor
County Road 64a over Elk RiverRoutt3 — Serious86Fair
96th Avenue over East Bijou CreekAdams3 — Serious82Fair
SH 116 Ml over Buffalo CreekBaca3 — Serious80Poor
County RD 53.7 over Tributary Salado CreekLas Animas3 — Serious80Fair
County RD 69.1 over Raton CreekLas Animas3 — Serious75Fair
Co RD 54a over Middle Boulder CreekBoulder3 — Serious70Fair
Co RD 54a over Middle Boulder CreekBoulder3 — Serious66Fair
County Road 3t over Arikaree RiverLincoln3 — Serious65Good
County RD 53.5 over Trib. Burro Canyon CreekLas Animas3 — Serious64Fair
County Road 162 over Wilson Creek TributaryElbert3 — Serious63Fair
County Road 80 over N. Poudre Canal/park Cr.Larimer3 — Serious59Fair
County Road 103 over Middle St. Vrain CreekBoulder3 — Serious56Fair
County RD 42.0 over Apishapa RiverLas Animas3 — Serious54Fair
Townsend Street over Cornet CreekSan Miguel3 — Serious50Fair
County Road 125 over East Bijou CreekElbert3 — Serious48Fair
County Road 37 over N Fork Frenchman CreekPhillips3 — Serious48Fair
County Road 39 over Cheyenne CreekProwers3 — Serious43Fair
County Road 178 over Bijou Creek TributaryElbert3 — Serious40Fair