Longest Bridges in Louisiana

The longest bridge in Louisiana is the Cswy Bridge N. B. over Lake Pontchartrain, at 24.1 miles (127,269 ft) of total structure length. The table below ranks the longest bridges in Louisiana by structure length.

BridgeCountyLengthYear BuiltDaily Traffic
Cswy Bridge N. B. over Lake PontchartrainSt. Tammany127,269 ft (24.1 mi)196518,830
Causeway SB over Lake PontchartrainSt. Tammany127,200 ft (24.1 mi)195618,830
I0055 over I-10 & US 51 & SwampSt. John the Baptist76,713 ft (14.5 mi)197524,000
I0055 over US 51 & SwampSt. John the Baptist75,831 ft (14.4 mi)197524,000
I0010 over Bonnet Carre SpillwaySt. Charles50,813 ft (9.6 mi)197232,050
I0010 over Bonnet Carre SpillwaySt. Charles50,771 ft (9.6 mi)197248,723
I0055 over Elevated RdwyTangipahoa42,125 ft (8.0 mi)197939,850
I0055 over Manchac Int/service RDTangipahoa42,125 ft (8.0 mi)197917,665
I0010 over La975 E Floodway La3000Iberville41,996 ft (8.0 mi)197221,450
I0010 over East FloodwayIberville41,996 ft (8.0 mi)19721,585
Us0090 over Drain Canals La.20 RrTerrebonne29,543 ft (5.6 mi)19954,014
Us0090 over Drainage Canals La.20 RrTerrebonne29,543 ft (5.6 mi)19953,007
I0010 over Lake PonchartrainOrleans29,202 ft (5.5 mi)20111,600
I0010 over Lake PonchartrainOrleans29,187 ft (5.5 mi)201187,741
La3235 over WetlandsLafourche29,040 ft (5.5 mi)20123,305
Us0090-b over Harvey Canal/sts/rrJefferson29,032 ft (5.5 mi)1987101,282
Us0090-b over Harvey Canal/sts/rrJefferson29,030 ft (5.5 mi)198767,143
I0310 over US 61/rr/swamp/la 626St. Charles25,754 ft (4.9 mi)199220,850
I0310 over US 61/rr/swamp/la 626St. Charles25,671 ft (4.9 mi)199220,850
Us0011 over Lake PontchartrainOrleans24,921 ft (4.7 mi)19383,912
I0010 over W Atchafalaya FloodwaySt. Martin23,439 ft (4.4 mi)197137,370
I0010 over W Atchafalaya FloodwaySt. Martin23,439 ft (4.4 mi)19711,585
I0010 over E Atchafalaya FloodwaySt. Martin21,584 ft (4.1 mi)197242,449
I0010 over E Atchafalaya FloodwaySt. Martin21,584 ft (4.1 mi)19721,585
I0010 over City StreetsOrleans19,771 ft (3.7 mi)19691,600
Us0190 over Morganza FldwyPointe Coupee18,777 ft (3.6 mi)194512,942
I0010 over Reserve Relief CanalSt. John the Baptist18,730 ft (3.5 mi)197444,074
I0010 over Reserve Relief CanalSt. John the Baptist18,730 ft (3.5 mi)197427,551
I0010 over City StreetsOrleans18,246 ft (3.5 mi)196947,100
Us0090 over La 182/la70/loc/drainageSt. Mary14,161 ft (2.7 mi)19777,885
La0006 over Toledo Bend Res.Sabine13,195 ft (2.5 mi)19673,030
Us0090 over Alligator BayouAssumption12,079 ft (2.3 mi)19984,014
Us0090 over B.caroline & B.alligatorAssumption12,074 ft (2.3 mi)199810,035
I0010 over US 51 & SwampsSt. John the Baptist11,752 ft (2.2 mi)197248,723
I0010 over US 51 & SwampsSt. John the Baptist11,715 ft (2.2 mi)197227,372
I0110 over City StreetsEast Baton Rouge11,548 ft (2.2 mi)197064,059
I0110 over City StreetsEast Baton Rouge11,536 ft (2.2 mi)196932,092
I0610 over City StreetsOrleans11,342 ft (2.1 mi)197540,300
I0020 over Mississippi RiverMadison11,051 ft (2.1 mi)197336,023
I0049 over Hwys Strts Rr BayouRapides10,503 ft (2.0 mi)199442,770
I0049 over Hwys Strts Rr BayouRapides10,487 ft (2.0 mi)19957,400
I0220 over Cross Lake Kcs Csr La 17Caddo10,229 ft (1.9 mi)198842,148
La0001 over Bayou LafourcheLafourche10,215 ft (1.9 mi)20093,305
I0020 over City St/icg Rr/ouachitaOuachita9,154 ft (1.7 mi)196584,225
I0020 over City St/icg Rr/ouachitaOuachita9,154 ft (1.7 mi)196566,061
La0070 over Mississippi RiverSt. James9,102 ft (1.7 mi)196317,100
I0210 over Prien LakeCalcasieu8,500 ft (1.6 mi)196458,320
Us0090 over Bayou RamosSt. Mary8,369 ft (1.6 mi)199410,035
Us0090 over Bayou RamosSt. Mary8,349 ft (1.6 mi)19947,885
La0154 over Lake BistineauBossier7,839 ft (1.5 mi)20031,559
Us0090 over Deadwood RD Tiger BayouTerrebonne7,703 ft (1.5 mi)19944,014
Us0090 over Deadwood RD Tiger BayouTerrebonne7,632 ft (1.4 mi)19943,007
I0610 over City StreetsOrleans7,446 ft (1.4 mi)197529,280
La0010 over Mississippi RiverWest Feliciana6,779 ft (1.3 mi)20115,763
I0010 over Inner Harbor /city StsOrleans6,714 ft (1.3 mi)1966181,400
La0047 over I C Waterway(gulf OutletOrleans6,622 ft (1.3 mi)196723,365
I0010 over Calcasieu River Rr StsCalcasieu6,617 ft (1.3 mi)195286,600
Us0090-b over City StreetsOrleans6,201 ft (1.2 mi)1995154,311
I0110 over La 408; Badley St; ParkEast Baton Rouge6,084 ft (1.2 mi)198264,059
I0110 over La 408; Badley St; ParkEast Baton Rouge6,084 ft (1.2 mi)198232,092
Us0061 over Bonnet Carre SpillwaySt. Charles6,005 ft (1.1 mi)198423,719
Us0061 over Bonnet CarreSt. Charles6,005 ft (1.1 mi)193525,051
I0310 over Ramps/rr/canal/us 61St. Charles6,000 ft (1.1 mi)199215,642
Us0190 over Mississippi RiverEast Baton Rouge5,878 ft (1.1 mi)193918,380
Us0171 over Calcasieu RiverCalcasieu5,702 ft (1.1 mi)196932,659
Us0090-b over City Sts.us.90bn/b RmpsOrleans5,596 ft (1.1 mi)199614,010
I0310 over Ramps/us 61St. Charles5,575 ft (1.1 mi)199215,642
La0319 over Intracoastal CanalSt. Mary5,513 ft (1.0 mi)2005914
Us0090 over Bayou BoeufAssumption5,414 ft (1.0 mi)199810,035
La3052 over La 20 Sp Rr Drain CanaTerrebonne5,251 ft (1.0 mi)19943,007
Us0090 over La 18 And 541Jefferson5,162 ft (1.0 mi)201355,210
Us0090 over La 18 And 541Jefferson5,162 ft (1.0 mi)201328,780
I0310 over Icg.rr Ramp E F &h La4St. Charles5,145 ft (1.0 mi)198347,396
Us0090 over Rigolets PassOrleans5,094 ft (1.0 mi)20081,215
La0407 over (new)algiers Cutoff CanaOrleans5,082 ft (1.0 mi)198511,240
Us0090-b over City StreetsOrleans5,038 ft (1.0 mi)195767,143
I0010 over I-10 Serv Rds B. Sab RCalcasieu5,006 ft (0.9 mi)200216,426
I0010 over Sabine RiverCalcasieu5,006 ft (0.9 mi)200277,897
I0010 over East Pearl RiverSt. Tammany4,986 ft (0.9 mi)196687,741
Us0090-b over R/r City StsOrleans4,896 ft (0.9 mi)196067,143
I0310 over I-10/I-310/SWAMPSt. Charles4,814 ft (0.9 mi)199215,642
I0310 over I-10St. Charles4,752 ft (0.9 mi)199215,642
I0510 over City StreetsOrleans4,750 ft (0.9 mi)199229,280
La0009 over Black LakeNatchitoches4,724 ft (0.9 mi)20102,118
Us0090 over La 48 And La 611-1Jefferson4,706 ft (0.9 mi)201330,800
I0010 over City StreetsOrleans4,678 ft (0.9 mi)196085,050
Us0090 over La 48 And 611-1Jefferson4,666 ft (0.9 mi)201328,780
La3134 over La45;la303;icwwJefferson4,624 ft (0.9 mi)19767,042
La0002 over Ouachita SterlingtonOuachita4,560 ft (0.9 mi)20096,258
I0010 over Mississippi RiverEast Baton Rouge4,549 ft (0.9 mi)1968197,070
I0010 over Airline HWY US 61Orleans4,520 ft (0.9 mi)1977132,500
Us0090-b over R/r City StsOrleans4,480 ft (0.8 mi)1960154,311
I0010 over City Streets /rrOrleans4,436 ft (0.8 mi)19601,600
I0510 over City StreetsOrleans4,323 ft (0.8 mi)199210,794
La0027 over Intracoastal WaterwayCameron4,244 ft (0.8 mi)19763,506
Us0090-b over La.428 And City StreetsOrleans4,238 ft (0.8 mi)19958,940
Us0065 over Mississippi RiverConcordia4,205 ft (0.8 mi)194021,661
Us0065 over Mississippi RiverConcordia4,202 ft (0.8 mi)198920,933
La3087 over Intracoastal WwTerrebonne4,196 ft (0.8 mi)198013,617
Us0071 over La 1 Fr. Road Up RrRapides4,152 ft (0.8 mi)199618,100
Us0071 over La 1 Frontage Rd. Up RRapides4,152 ft (0.8 mi)199427,628
La0001 over Morganza SpillwayPointe Coupee4,125 ft (0.8 mi)19543,874
I0310 over Ramps/rr/canal/us 61St. Charles4,098 ft (0.8 mi)199215,642
I0049 over I-49 US 167 Ramps CitRapides4,067 ft (0.8 mi)199433,869
La0023 over Doullut CanalPlaquemines4,055 ft (0.8 mi)19755,170
Us0090-b over City StreetsOrleans3,998 ft (0.8 mi)199467,143
I0049 over City Sts/kcs RrCaddo3,985 ft (0.8 mi)199187,568
I0049 over City Sts/kcs RrCaddo3,985 ft (0.8 mi)199128,142
Us0190 over Atchafalaya FloodwaySt. Landry3,983 ft (0.8 mi)196120,176
Us0190 over Atchafalaya FldwySt. Landry3,983 ft (0.8 mi)196114,088
La0001 over Atchafalaya RiverAvoyelles3,957 ft (0.7 mi)19714,054
La0001 over MarshLafourche3,957 ft (0.7 mi)20091,060
La0010 over RailroadPointe Coupee3,874 ft (0.7 mi)20105,763
I0110 over US 61b & La 73East Baton Rouge3,835 ft (0.7 mi)196332,092
La0001 over Caminada BayJefferson3,806 ft (0.7 mi)20123,305
La0082 over Intracoastal WaterwayVermilion3,794 ft (0.7 mi)19762,899
La0107 over Red RiverAvoyelles3,779 ft (0.7 mi)20003,354
La0082 over Sabine LakeCameron3,774 ft (0.7 mi)20101,058
La0182 over Atchaf.r/berwick BaySt. Mary3,746 ft (0.7 mi)193312,788
La0317 over Icww @ Bayou SaleSt. Mary3,725 ft (0.7 mi)19822,218
Us0090 over City Sts I10 Ramps Us9Orleans3,666 ft (0.7 mi)19943,803
I0010 over I-10Jefferson3,664 ft (0.7 mi)201215,955
La0182 over Bayou BeoufAssumption3,654 ft (0.7 mi)19583,905
La0022 over Tickfaw RiverLivingston3,654 ft (0.7 mi)20002,729
I0110 over US 61b & La73East Baton Rouge3,643 ft (0.7 mi)196344,500
La0014 over Mermentau RiverVermilion3,616 ft (0.7 mi)19761,717
La0308 over La657-icww-str@laroseLafourche3,589 ft (0.7 mi)197512,186
I0020 over Ramp I-20Caddo3,561 ft (0.7 mi)198587,567
I0310 over Ramps/us 61St. Charles3,542 ft (0.7 mi)199215,642
La0015 over Old River Overbank C.s.Concordia3,505 ft (0.7 mi)1959602
Us0090 over City StreetsOrleans3,455 ft (0.7 mi)195649,920
Us0090 over City StreetsOrleans3,455 ft (0.7 mi)196049,920
I0049 over US 79 & 80 I-20 & Kcs RCaddo3,437 ft (0.7 mi)199378,214
I0049 over Us79-80 I20 & RrsCaddo3,437 ft (0.7 mi)199378,214
Us0190 over Atchafalaya R @ KspngsSt. Landry3,435 ft (0.7 mi)198812,578
Us0190 over Atchafalaya R @ KspngsSt. Landry3,402 ft (0.6 mi)197320,176
La 23 over Intercoastal WaterwayPlaquemines3,401 ft (0.6 mi)202439,114
Us0090 over La308 B.lafourche La1Lafourche3,331 ft (0.6 mi)197614,300
I0220 over Red River/la 3049/538Bossier3,301 ft (0.6 mi)197742,148
I0049 over I-220Caddo3,299 ft (0.6 mi)201887,567
I0310 over La 3127 & I-310St. Charles3,299 ft (0.6 mi)198615,642
La0008 over Ouachita RiverCatahoula3,274 ft (0.6 mi)20171,394
Us0090 over Ind Cl/france Rd/n.o. RrOrleans3,270 ft (0.6 mi)19891,215
La0024 over Intracoastal WaterwayTerrebonne3,270 ft (0.6 mi)199620,358
Us0090 over Franklin CanalSt. Mary3,264 ft (0.6 mi)197910,063
La0001 over MarshLafourche3,232 ft (0.6 mi)20093,305
Us0090 over La1 B.lafourche La 308Lafourche3,230 ft (0.6 mi)197614,300
La0024 over Intracoastal WaterwayTerrebonne3,229 ft (0.6 mi)199629,371
La0010 over Pearl RiverWashington3,222 ft (0.6 mi)19983,700
I0110 over La 67-plank RDEast Baton Rouge3,204 ft (0.6 mi)196844,500
Us0084 over Black RiverConcordia3,203 ft (0.6 mi)20097,080
Us0090 over Franklin CanalSt. Mary3,196 ft (0.6 mi)197911,104
La0010 over Mississippi RiverWest Feliciana3,185 ft (0.6 mi)20115,763
I0310 over GroundSt. Charles3,180 ft (0.6 mi)199229,468
I0020 over I-20 Ramp W-s Mkt St.Caddo3,175 ft (0.6 mi)198587,567
Us0090-b over La 428/us 90b/ramps/stsOrleans3,164 ft (0.6 mi)19897,620
I0110 over La 67-plank RDEast Baton Rouge3,115 ft (0.6 mi)196844,500
La0002 over Red River-millers BluffBossier3,100 ft (0.6 mi)19552,059
I0049 over I-220Caddo3,069 ft (0.6 mi)201859,221
I0010 over La 427-acadian Tw/kcs RrEast Baton Rouge3,067 ft (0.6 mi)196476,350
I0010 over La 427-acadian Tw/kcs RrEast Baton Rouge3,067 ft (0.6 mi)196432,092
La0008 over Red River La 1 Up RrGrant3,066 ft (0.6 mi)19842,091
I0055 over Pass ManchacTangipahoa3,051 ft (0.6 mi)197739,850
I0055 over Pass ManchacTangipahoa3,051 ft (0.6 mi)197714,300
I0010 over Atchafalaya RiverSt. Martin3,040 ft (0.6 mi)197256,100
Us0090-b over Mississippi RiverOrleans3,019 ft (0.6 mi)195767,143
Us0090-b over Mississippi RiverOrleans3,019 ft (0.6 mi)1985154,311
Us0071 over Red River Fort BuhlowRapides3,015 ft (0.6 mi)201510,090
Old US 51 over Pass ManchacTangipahoa3,012 ft (0.6 mi)19574,107
La3213 over Mississippi RiverSt. James3,009 ft (0.6 mi)198913,743
Us0071 over Red River Fort BuhlowRapides3,004 ft (0.6 mi)201617,593
Us0080 over Red River @ Texas St.Bossier2,981 ft (0.6 mi)193411,856
I-10 over Loyola DRJefferson2,979 ft (0.6 mi)20237,010
I0010 over La 49; IntgsJefferson2,959 ft (0.6 mi)200115,955
Us0090 over Charenton Canal/frontageSt. Mary2,923 ft (0.6 mi)19788,307
Us0090 over Charenton CanalSt. Mary2,923 ft (0.6 mi)197821,000
I0510 over Rr/us 90(chef Hwy)Orleans2,917 ft (0.6 mi)199229,280
La0027 over Icww - EllendersCalcasieu2,903 ft (0.5 mi)19774,583
Us0190 over Amite RiverLivingston2,899 ft (0.5 mi)200910,200
Us0190 over Amite RiverLivingston2,899 ft (0.5 mi)201023,971
I0010 over Veterans BLVD Off RampJefferson2,893 ft (0.5 mi)201115,955
I0010 over Ramp To Moisant AirportJefferson2,867 ft (0.5 mi)197912,157
La0511 over Red R. C.fant PKWY Ar TeBossier2,823 ft (0.5 mi)196828,999
I0310 over Mississippi RiverSt. Charles2,745 ft (0.5 mi)198347,396
La3032 over Red River Fant&teague PkCaddo2,733 ft (0.5 mi)200814,900
Us0090 over Little B Black/la 311/spTerrebonne2,721 ft (0.5 mi)19878,789
Us0090 over Little B Black/la 311/spTerrebonne2,721 ft (0.5 mi)198711,661
I0010 over Whiskey Bay ChannelIberville2,707 ft (0.5 mi)197242,449
La3032 over Red River Fant/parkwayCaddo2,691 ft (0.5 mi)197226,979
I0010 over Washington StreetEast Baton Rouge2,690 ft (0.5 mi)196332,092
Us0084 over Red RiverRed River2,682 ft (0.5 mi)19908,296
I0010 over La 30 & City StreetsEast Baton Rouge2,681 ft (0.5 mi)1967197,070
Lapalco BLVD over Harvey CanalJefferson2,660 ft (0.5 mi)197260,000
I0059 over West Pearl RiverSt. Tammany2,645 ft (0.5 mi)199736,841
I0059 over West Pearl RiverSt. Tammany2,645 ft (0.5 mi)199616,250
I0010 over Vet Mem HWYJefferson2,620 ft (0.5 mi)1967137,542
I0510 over Rr/us 90(chef Hwy)Orleans2,618 ft (0.5 mi)199214,600
I0012 over Amite RiverLivingston2,615 ft (0.5 mi)201255,700
I0012 over Amite RiverLivingston2,615 ft (0.5 mi)201155,700
Us0090 over Sp. Rr. & City Strs.Orleans2,615 ft (0.5 mi)1988154,311