Sonestown Covered Bridge (Sullivan County, Pennsylvania)
Built 1900; rehabilitated 2001
Covered bridge over Muncy Creek on Champion Road (TR 310)
Open to traffic

Sorrel Creek Bridge (Garland County, Arkansas)
Built 1930 by the West Arkansas Construction Co. of McAlister, Oklahoma
Small concrete arch bridge over Sorrel Creek on AR 7
Open to two-lane traffic

Soto Street Bridge over the Los Angeles River (Los Angeles County, California)
Built 1928; rehabilitated 1987
Concrete arch bridge over Los Angeles River on Soto Street in Vernon
Open to traffic

South Big River Bridge (St. Francois County, Missouri)
Built 1924; made obsolete by new bridge in 1957
Through truss bridge over Big River on Old US 67 in Desloge
Open to two-lane traffic

South Boat Ditch Bridge (Clark County, Arkansas)
Built ca. 1928
Through truss bridge over South Boat Ditch on CR 8
Open to one-lane traffic

South Boat Ditch US 67 Bridge (Clark County, Arkansas)
Built 1931 by the Virginia Bridge & Iron Co. of Roanoke, Virginia
Pony truss bridge over South Boat Ditch on US 67
Open to two-lane traffic

South Boston Road Bridge (Washington County, Indiana)
Built ca. 1930
Pony truss bridge over Middle Fork Blue River on Canton/S. Boston
Open to traffic

South Cicero Avenue Bridge (Cook County, Illinois)
Built 1927; widened and rehabilitated 1966
Bascule bridge over the Chicago S&S Canal on S. Cicero Avenue (IL 50) in Chicago
Open to four lanes of traffic

South Fork 186A Bridge (Christian County, Illinois)
Pony truss bridge over South Fork Sangamon River on TR 186A, 5 mi. southwest of Rosamond
Open to traffic

South Fork Blue River IN 60 Bridge (Washington County, Indiana)
Built 1937
Concrete arch bridge over South Fork Blue River on IN 60 in New Pekin
Open to traffic

South Fork Blue River Main Street Bridge (Washington County, Indiana)
Built 1884; rehabilitated 1987
Through truss bridge over South Fork Blue River on Main Street in New Pekin
Open to traffic

South Fork Bridge (Christian County, Illinois)
Pony truss bridge over South Fork Sangamon River on TR 343, 8 mi. west of Rosamond
Open to traffic

South Fork Bridge (Christian County, Illinois)
Pony truss bridge over South Fork Sangamon River on TR 307A, 7 mi. east of Morrisonville
Open to traffic

South Fork Cane Creek Bridge (Carter County, Missouri)
Built 1922
Pony truss bridge over South Fork of Cane Creek south of Ellsinore on CR 256 (Old US 60)
Open to traffic with no posted weight limit

South Fork Pottawatomie Creek Bridge (Anderson County, Kansas)
Built 1934
Concrete pony arch bridge over South Fork Pottawatomie Creek, 0.5 mi. south and 3.7 mi. east of Garnett
Open to traffic

South Fork Root River Bridge (Fillmore County, Minnesota)
Built 1931
Pony truss bridge over South Fork Root River on MN 43
Open to traffic

South Fork TR 343 Bridge No. 2 (Christian County, Illinois)
Pony truss bridge over South Fork Sangamon River on TR 343, 8 mi. west of Rosamond
Open to traffic

South Fork US 421 Bridge (Clinton County, Indiana)
Built 1940; rehabilitated 1985
Pony truss bridge over South Fork Wildcat Creek on US 421
Open to traffic

South Fork US 65 Bridge (Van Buren County, Arkansas)
Built 1931 by M.K. Orr of Little Rock; rehabilitated 1962
Three-span cantilevered deck truss bridge over South Fork Little Red River on US 65 in Clinton
Open to traffic

South Gabouri Creek Bridge (Ste. Genevieve County, Missouri)
Built 1934, replacing an earlier through truss bridge
Concrete bridge over South Fork Gabouri Creek on Fourth Street in Ste. Genevieve, just beyond the end of MO 32
Open to two-lane traffic

South Harpeth River TN 100 Bridge (Davidson County, Tennessee)
Built 1929
Through truss bridge over South Harpeth River on TN 100 in Nashville
Open to traffic

South Island Bridge (Will County, Illinois)
Pony truss bridge over East Branch Kankakee River on West Street, 0.25 mi. north of Kahler Rd
Open to one-lane traffic

South Lafave River AR 7 Bridge (Perry County, Arkansas)
Built 1933 by McEachin and McEachin, Inc., of Little Rock
Two-span pony truss bridge over South Fourche Lafave River on AR 7
Open to two-lane traffic

South Moreau Creek Route D Bridge (Cole County, Missouri)
Built 1956
Through truss bridge over South Moreau Creek on Route D
Open to one-lane traffic

South River CR 402 Bridge (Marion County, Missouri)
Built ca. 1930, replacing an earlier bridge
Pony truss bridge over South River on CR 402, east of Palmyra
Open to one-lane traffic

South Wea Creek Bridge (Miami County, Kansas)
Built 1915
Concrete arch bridge over South Wea Creek, 3.0 mi. south and 0.6 mi. west of Louisburg
Open to traffic

Sparkman Street Bridge (Morgan County, Alabama)
Built 1915
Concrete arch bridge over Shoal Creek on Sparkman Street in Hartselle
Open to traffic

Speakman Covered Bridge (Chester County, Pennsylvania)
Built 1881
Covered bridge over Buck Run T Branch on Frog Hollow Road
Open to traffic

Spencer Creek Covered Bridge (St. Charles County, Missouri)
Built 1976 by Roger Adams
Replica covered bridge over Spencer Creek at Spencer Creek Subdivision in St. Peters
Open to traffic

Spencerville Covered Bridge (De Kalb County, Indiana)
Built 1873 by John McKay
Covered bridge over Saint Joseph River on CR 68
Open to traffic

Spider Leg Bridge (Crawford County, Kansas)
Built in 1914 to replace a wooden bridge.
Closed-spandrel arch bridge over Branch of West Fork Dry Wood Creek on Saint Louis-San Francisco Railroad
Open to traffic

Spillman Creek Bridge (Lincoln County, Kansas)
Built ca. 1910
Pony truss bridge over Spillman Creek, 1.3 mi. north and 2.0 mi. east of Vesper
Open to traffic

Spillman Creek Bridge (Lincoln County, Kansas)
Built ca. 1930
Stone arch bridge over Spillman Creek, 3.5 mi. south and 0.3 mi. east of Ash Grove
Open to traffic

Splice Creek Road Bridge (Moniteau County, Missouri)
Built or relocated here ca. 1930
Pony truss bridge over Splice Creek on East Splice Creek Road near Lupus
Open to one-lane traffic

Split Rock Bridge (Pipestone County, Minnesota)
Built 1938 by the Works Progress Administration
Stone arch bridge at Split Rock Creek State Park on CR 54
Open to traffic

Spring Creek 1900N Bridge (Iroquois County, Illinois)
Built 1916
Through truss bridge over Spring Creek on 1900N Road
Open to traffic

Spring Creek Branch 1250N Bridge (Iroquois County, Illinois)
Built 1904
Two-span bedstead pony truss bridge over a branch of Spring Creek on 1250N Road
Open to one-lane traffic

Spring Creek Bridge (Rockingham County, Virginia)
Built 1925 by the Champion Bridge Co.
Pony truss bridge over Spring Creek on Route 748 at Spring Creek
Open to one-lane traffic

Spring Creek Bridge (Atchison County, Kansas)
Built ca. 1930
Pony truss bridge over Spring Creek, 1.0 mi. west and 1.6 mi. north of Arrington
Open to traffic

Spring Creek CR 519 Bridge (Maries County, Missouri)
Built ca. 1930
Concrete tee beam bridge over Spring Creek on CR 519
Open to traffic

Spring Lake Bridge (Yell County, Arkansas)
Built 1936 by the United States Resettlement Administration (WPA)
Small two-span stone arch bridge over Bob Barnes Branch at Spring Lake Recreation Area
Open to traffic

Spring River CR 1040 Bridge (Lawrence County, Missouri)
Built ca. 1930
Through truss bridge over Spring River on CR 1040
Open to traffic

Spring River CR 2130 Bridge (Lawrence County, Missouri)
Pony truss bridge over Spring River on CR 2130
Open to one-lane traffic

Spring River CR 74 Bridge (Fulton County, Arkansas)
Built 1916 by H.B. Walton
Five-span concrete deck girder bridge over Spring River on CR 74 (Old US 63) in Mammoth Spring
Open to one-lane traffic

Spring River Old US 60 Bridge (Lawrence County, Missouri)
Built 1927
Concrete tee beam bridge over Spring River on Business US 60 near Verona
Open to two-lane traffic

Spring River Route D Bridge (Jasper County, Missouri)
Pony truss bridge over Spring River on Route D southwest of Purcell
Open to two-lane traffic

Spring River Route O Bridge (Jasper County, Missouri)
Built 1935
Through truss bridge over Spring River on Route O
Open to two-lane traffic

Spring Road Bridge (Grundy County, Illinois)
Built 1910
Three-span concrete girder bridge over Mazon River on Spring Road (TR 105), .3 mi. east of Campbell Rd
Open to one-lane traffic

Spring Street Bridge (Crawford County, Missouri)
Built 1937 by the Works Progress Administration
Stringer bridge over Yadkin Creek on Spring Street in Steelville
Open to one-lane traffic with a 15 ton weight limit

Spring Street Bridge (Garland County, Arkansas)
Concrete arch bridge over Gulpha Creek on Spring Street in Hot Springs
Open to two-lane traffic

Spring Street Bridge (Floyd County, Indiana)
Built ca. 1920
Four-span concrete arch bridge over Silver Creek on Spring Street in Clarksville
Open to traffic

Spring Valley Bridge (Bureau County, Illinois)
Built 1934; rehabilitated 1989
Five-span through truss bridge over the Illinois River on IL 89 south of Spring Valley
Open to two-lane traffic

SS Badger, Lake Michigan Carferry Service (Manitowoc County, Wisconsin)
Built in 1952 by Christy Corporation of Sturgeon Bay, Wisconsin, Put into service 1953
Ferry across Lake Michigan on US 10
Operates daily May through October, 2 crossings Spring & Fall, 4 crossings in Summer

St. Elmo Bridge (Chaffee County, Colorado)
Built 1953
Wooden deck bridge over Chalk Creek on CR 267 at St. Elmo
Open to one-lane traffic

St. Francis River Route E Bridge (Madison County, Missouri)
Built 1936
Two-span through truss bridge over St. Francis River on Route E
Open to two-lane traffic

St. Francisville Bridge (Lawrence County, Illinois)
Through truss swing bridge over the Wabash River near St. Francisville
Open to one-lane traffic, with a tollbooth in St. Francisville

St. Johns Creek Route YY Bridge (Franklin County, Missouri)
Built 1957
Three-span pony truss bridge over St. Johns Creek on Route YY
Open to two-lane traffic

St. Laurent Creek Bridge (Ste. Genevieve County, Missouri)
Built ca. 1920
Pony truss bridge over St. Laurent Creek on Second Street (unmarked) in St. Mary just south of US 61 and just north of the Perry County line
Open to one-lane traffic with a weight limit

St. Laurent Creek CR 930 Bridge (Perry County, Missouri)
Built ca. 1930
Bedstead pony truss bridge over St. Laurent Creek on CR 930 southeast of St. Mary
Open to traffic on a gravel road with a 4 ton weight limit

St. Louis Bay Bridge (Douglas County, Wisconsin)
Built 1961; rehabilitated 1994
Steel through arch bridge over St. Louis Bay on IH 535/US 53 in Superior
Open to traffic

St. Marys Bridge (Pleasants County, West Virginia)
Cantilevered through truss bridge over Ohio River on WV 16 at St. Marys
Open to traffic

Stagecoach Road Bridge (Jersey County, Illinois)
Through truss bridge over Piasa Creek on Stagecoach Road (TR 154)
Open to one-lane traffic

State Center Lincoln Highway C&NW Bridge (Story County, Iowa)
Deck plate girder bridge over 4th Street SW (The Lincoln Highway) on Union Pacific Double Mainline (Formerly Chicago & North Western Railway)
Open to traffic

State Hospital Entrance Bridge (Jefferson County, Indiana)
Built 1930
Concrete arch bridge over the Madison Railroad at Madison State Hospital, just off IN 7
Open to one-lane light traffic

State Road Covered Bridge (Ashtabula County, Ohio)
Built 1983 by John Smolen
Modern covered bridge over Conneaut Creek on State Road (CH 354)
Open to traffic

State Street Bridge (Jackson County, Minnesota)
Built 1985. Previous spans consisted of a 5-panel through truss bridge built ca. 1900. Span was replaced with riveted Parker through truss span relocated from US 71 Bridge. Bridge was constructed by Iowa Bridge Co. in 1924. Bridge replaced 1985
Steel stringer bridge over Des Moines River on State Street in Jackson
Open to traffic

State Street Bridge (Cook County, Illinois)
Built 1949
Bascule bridge over Main Branch Chicago River on State Street in Chicago
Open to traffic

State Street Bridge (Fountain County, Indiana)
Built 1963
Pony truss bridge over Coal Creek on State Street in Veedersburg
Open to traffic

Steamboat Bill Bridge (Limestone County, Alabama)
Built 1963 and replaced the older Keller Memorial Bridge, which was a drawbridge. Eastbound bridge built 1999.
Cantilevered through truss bridge over Tennesee River on US 31/ALT US 72/AL 20
Open to traffic

Stewart Creek Bridge (Cowley County, Kansas)
Built 1904
Stone arch bridge over Stewart Creek on a local road east of Udall
Open to one-lane traffic

Steyer Bridge (Winneshiek County, Iowa)
Limestone deck arch was locally built by Michael Steyer.
Bridge over Twin Springs Creek on Oneata Drive
Open to traffic

Stillions Bridge (Ashley County, Arkansas)
Built 1906 by the Pennsylvania Steel Co.
Through truss swing bridge over Saline River on the Fordyce and Princeton Railroad (formerly Rock Island) northwest of Crossett
Open to railroad traffic

Stones Branch Bridge (Bollinger County, Missouri)
Built 1922
Pony truss bridge over Stones Branch on MO 51, near the Route A intersection
Open to two-lane traffic on a paved road

Stones River TN 24 Bridge (Davidson County, Tennessee)
Built 1928
Through truss bridge over Stones River on TN 24 in Nashville
Open to traffic

Stono River SC 700 Bridge (Charleston County, South Carolina)
Built 1929 by the Greenville Steel & Iron Co.; rehabilitated and widened in 1951; replaced 2004
Lost pony truss swing bridge over Stono River on SC 700, west of Charleston
Open to traffic

Stony Creek Bridge (Dinwiddie County, Virginia)
Built 1926
Rainbow arch bridge over Stony Creek on Southbound US 1
Open to two lanes of southbound traffic

Stouts Creek Arch Bridge (Iron County, Missouri)
Built 1928
Open-spandrel arch bridge over Stouts Creek on MO 72 above Lake Killarney
Open to traffic

Stranger Creek Bridge (Atchison County, Kansas)
Built 1925
Pony truss bridge over Stranger Creek, 2.2 mi. north and 5.0 mi. west of Cummings
Open to traffic

Stranger Creek Bridge (Atchison County, Kansas)
Built 1925
Pony truss bridge over Stranger Creek, 0.5 mi. south and 0.5 mi. east of Farmington
Open to traffic

Stranger Creek Bridge (Leavenworth County, Kansas)
Through truss bridge over Stranger Creek on Metro Avenue, 5.0 mi. north and 0.7 mi. east of Linwood
Open to traffic

Stranger Creek Bridge (Atchison County, Kansas)
Built 1925; rehabilitated 1980
Pony truss bridge over Stranger Creek on Haskell Road, 0.5 mi. south of Farmington
Open to traffic

Stranger Creek Bridge (Atchison County, Kansas)
Built 1922
Pony truss bridge over Stranger Creek, 1.3 mi. north and 0.5 mi. east of Cummings
Open to traffic

Strawberry River US 167 Bridge (Sharp County, Arkansas)
Built 1928 by Fred Luttjohann; widened in 1955
Three-span open-spandrel arch bridge over Strawberry River on US 167
Open to two-lane traffic

Streit Road Bridge (McHenry County, Illinois)
Pony truss bridge over North Branch Kishwaukee Creek on Streit Road
Open to two-lane traffic

Stringtown Bridge (Cole County, Missouri)
Built 1930; made obsolete by new bridge in 1974
Through truss bridge over North Moreau Creek on Hemstreet Road west of Jefferson City
Open to two-lane traffic

Stucker Creek IN 3 Bridge (Scott County, Indiana)
Built 1939; rehabilitated 1979
Pony truss bridge over Stucker Creek on IN 3
Open to traffic

Stuckey's Bridge (Lauderdale County, Mississippi)
Built 1901 by the Virginia Bridge & Iron Co.
Stearns through truss bridge over Chunky River on Stuckey Bridge Road
Open to one-lane traffic

Stump Ford Bridge (Cedar County, Missouri)
Pony truss bridge over Cedar Creek on CR 274
Open to one-lane traffic

Sugar Creek 350 West Bridge (Boone County, Indiana)
Built ca. 1910
Through truss bridge over Sugar Creek on CR 350 West (Creek Road) just east of I-65
Open to one-lane traffic

Sugar Creek Branch 3000E Bridge (Iroquois County, Illinois)
Built 1916; rehabilitated 1933
Through truss bridge over a branch of Sugar Creek on 3000E Road, 2 mi. northeast of Stockland
Open to traffic

Sugar Creek Bridge (Iroquois County, Illinois)
Built 1904(?)
Steel through arch bridge over Sugar Creek on 900N Road (CH 9), 3.25 mi. east of Milford
Open to one-lane traffic

Sugar Creek Bridge (Pike County, Missouri)
Pony truss bridge over Sugar Creek on CR 115
Open to one-lane with a 7 ton weight traffic

Sugar Creek CR 203 Bridge (Maries County, Missouri)
Built 1998-99 with a superstructure relocated from elsewhere
Pony truss bridge over Sugar Creek on CR 203 south of Meta
Open to traffic

Sulpher Lake Bridge (Redwood County, Minnesota)
Built 1927
Through truss bridge over Sulpher Lake on MN 19
Open to traffic

Sulphur Springs Railroad Bridge (Hillsborough County, Florida)
Through truss bridge over Hillsborough River on the former Seaboard Air Line Railway (now CSX)
Open to traffic

Sumner Avenue Bridge (Humboldt County, Iowa)
Built 1919
Three-span concrete arch bridge over West Fork Des Moines River on Sumner Avenue in Humboldt
Open to traffic

Sumnerville Station Bridge (Ottawa County, Kansas)
Built ca. 1930
Pony truss bridge over Solomon River on Quaker Road
Open to traffic

Sunny Valley Covered Bridge (Josephine County, Oregon)
Built 1920; rehabilitated 2001
Covered bridge over Grave Creek on Sunny Valley Loop
Open to traffic

Sunset Blvd. Bridge Over Myra (Los Angeles County, California)
Built 1929
Concrete arch bridge over Myra Avenue on Sunset Blvd. in Los Angeles
Open to traffic

Sunshine Skyway Bridge (Pinellas County, Florida)
Opened to traffic April 20, 1987
Cable-stayed bridge over Tampa Bay on I-275/US 19 at Saint Petersburg
Open to four lanes of traffic