Survey No. Name (as assigned by HAER) Status Type [2] Built Documented Carries Crosses Location Parish Coordinates LA-7 Krotz Springs Bridge Replaced K-truss 1934 1985 US 190 Atchafalaya River Krotz Springs St. Landry 30°32′46″N 91°44′59″W / 30.54611°N 91.74972°W / 30.54611; -91.74972 (Krotz Springs Bridge ) LA-8 Bayou Teche Bridge Replaced Swing span 1932 1985 LA 351 Bayou Teche Ruth St. Martin 30°14′13″N 91°52′41″W / 30.23694°N 91.87806°W / 30.23694; -91.87806 (Bayou Teche Bridge ) LA-13 DeSiard Street Bridge Replaced Swing span 1899 1997 DeSiard Street Ouachita River Monroe Ouachita 32°30′01″N 92°07′11″W / 32.50028°N 92.11972°W / 32.50028; -92.11972 (DeSiard Street Bridge ) LA-17 Huey P. Long Bridge Extant Cantilever 1935 2005 US 90 Mississippi River Jefferson Jefferson 29°56′39″N 90°10′08″W / 29.94417°N 90.16889°W / 29.94417; -90.16889 (Huey P. Long Bridge ) LA-18 Long–Allen Bridge Extant K-truss 1933 2000 US 79 / US 80 Red River Shreveport Caddo 32°31′05″N 93°44′33″W / 32.51806°N 93.74250°W / 32.51806; -93.74250 (Long-Allen Bridge ) LA-20 Ouachita River Bridge Demolished Parker truss 1932 2009 LA 2 Ouachita River Sterlington Ouachita 32°41′46″N 92°05′13″W / 32.69611°N 92.08694°W / 32.69611; -92.08694 (Ouachita River Bridge ) LA-21 Lake Pontchartrain Causeway & Southern Toll Plaza Bridge Extant Trestle 1956 2010 Causeway Boulevard Lake Pontchartrain Metairie and Mandeville Jefferson and St. Tammany 30°11′59″N 90°07′22″W / 30.19972°N 90.12278°W / 30.19972; -90.12278 (Lake Pontchartrain Causeway & Southern Toll Plaza Bridge ) LA-27 Missouri Pacific Railroad Bridge Extant Reinforced concrete girder 1932 2016 US 84 Missouri Pacific Railroad Tullos LaSalle 31°49′35″N 92°19′37″W / 31.82639°N 92.32694°W / 31.82639; -92.32694 (Missouri Pacific Railroad Bridge ) LA-28 Clarke Bayou Bridge Extant Box culvert 1926 2016 US 79 / US 80 westboundClarke Bayou Fillmore Bossier 32°34′04″N 93°29′08″W / 32.56778°N 93.48556°W / 32.56778; -93.48556 (Clarke Bayou Bridge ) LA-29 Bayou Teche Bridge Extant Rolling lift (Scherzer) bascule 1940 2016 LA 86 (Bridge Street) Bayou Teche New Iberia Iberia 30°00′21″N 91°49′01″W / 30.00583°N 91.81694°W / 30.00583; -91.81694 (Bayou Teche Bridge ) LA-30 Calcasieu River West Fork Bridge Extant Vertical-lift bridge 1968 2016 LA 378 Calcasieu River west fork Moss Bluff Calcasieu 30°17′49″N 93°14′56″W / 30.29694°N 93.24889°W / 30.29694; -93.24889 (Calcasieu River West Fork Bridge ) LA-31 West Pearl River Bridge Extant Vertical-lift bridge 1933 2016 US 90 West Pearl River Slidell St. Tammany 30°13′52″N 89°40′07″W / 30.23111°N 89.66861°W / 30.23111; -89.66861 (West Pearl River Bridge ) LA-32 Lockport Company Canal Bridge Extant Vertical-lift bridge 1959 2016 LA 1 (Crescent Avenue) Lockport Company Canal Lockport Lafourche 29°38′41″N 90°32′40″W / 29.64472°N 90.54444°W / 29.64472; -90.54444 (Lockport Company Canal Bridge ) LA-33 Lower Grand River Bridge Extant Swing span 1958 2016 LA 997 Lower Grand River Plaquemine Iberville 30°04′09″N 91°17′08″W / 30.06917°N 91.28556°W / 30.06917; -91.28556 (Lower Grand River Bridge ) LA-34 St. Martin Parish Road Bridge Extant Swing span 1939 2016 Parish Road 196 Bayou La Rose Butte La Rose St. Martin 30°16′55″N 91°44′08″W / 30.28194°N 91.73556°W / 30.28194; -91.73556 (St. Martin Parish Road Bridge ) LA-35 Terrebonne Parish Road No. 004 Bridge Extant Swing span 1959 2016 Parish Road 111 Bayou du Large Theriot Terrebonne 29°24′35″N 90°47′11″W / 29.40972°N 90.78639°W / 29.40972; -90.78639 (Terrebonne Parish Road No. 004 Bridge ) LA-36 Lacombe Bayou Bridge Extant Swing span 1938 2016 US 190 Bayou Lacombe Lacombe St. Tammany 30°18′50″N 89°56′08″W / 30.31389°N 89.93556°W / 30.31389; -89.93556 (Lacombe Bayou Bridge ) LA-37 Bayou Teche at Charenton Bridge Extant Swing span 1945 2016 LA 324 Bayou Teche Charenton St. Mary 29°53′14″N 91°31′22″W / 29.88722°N 91.52278°W / 29.88722; -91.52278 (Bayou Teche at Charenton Bridge ) LA-38 Pass Manchac Bridge Extant Steel rolled multi-beam 1957 2016 US 51 Pass Manchac Akers and Galva Tangipahoa and St. John the Baptist 30°17′08″N 90°24′04″W / 30.28556°N 90.40111°W / 30.28556; -90.40111 (Pass Manchac Bridge ) LA-39 Missouri Pacific Railroad Bridge Extant Steel rolled multi-beam 1938 2016 US 165 Missouri Pacific Railroad Bonita Morehouse 32°53′12″N 91°43′17″W / 32.88667°N 91.72139°W / 32.88667; -91.72139 (Missouri Pacific Railroad Bridge ) LA-40 Manchac Bayou Bridge Extant Warren truss 1931 2016 LA 73 Bayou Manchac Baton Rouge and Prairieville East Baton Rouge and Ascension 30°20′39″N 90°59′00″W / 30.34417°N 90.98333°W / 30.34417; -90.98333 (Manchac Bayou Bridge ) LA-41 Miller's Bluff Bridge Extant Warren truss 1955 2016 LA 2 Red River Plain Dealing and Hosston Bossier and Caddo 32°53′34″N 93°49′13″W / 32.89278°N 93.82028°W / 32.89278; -93.82028 (Miller's Bluff Bridge ) LA-42 Boeuf River Bridge Extant Parker truss 1926 2016 LA 132 Boeuf River Rayville Richland 32°18′05″N 91°56′29″W / 32.30139°N 91.94139°W / 32.30139; -91.94139 (Boeuf River Bridge ) LA-43 Charenton Bridge Extant K-truss 1941 2016 LA 182 Charenton Drainage and Navigation Canal Baldwin St. Mary 29°49′31″N 91°32′17″W / 29.82528°N 91.53806°W / 29.82528; -91.53806 (Charenton Bridge ) LA-49 Illinois Central Railroad, McComb Subdivision, Mainline Bridge 891.5 Extant Trestle 1935 2018 Canadian National Railway Bonnet Carré Spillway Norco and LaPlace St. Charles and St. John the Baptist 30°03′47″N 90°23′09″W / 30.06306°N 90.38583°W / 30.06306; -90.38583 (Illinois Central Railroad, McComb Subdivision, Mainline Bridge 891.5 )