Side Ditch Entrance Bridge (Dubuque County, Iowa)
Built 1900
Pony truss bridge over Side Ditch on an entrance road
Open to traffic

Silver Bridge (Franklin County, Arkansas)
Built ca. 1929 by the Lakeside Bridge & Steel Co.; rehabilitated 1976; closed to traffic Nov. 2006
Three-span through truss bridge over Mulberry River on CR 67 (Wire Road) just north of I-40 in Mulberry
Closed to traffic

Silver Creek Bridge (Cedar County, Missouri)
Lost pony truss bridge over Silver Creek on CR 1651
No longer exists

Silver Creek Bridge (Minnehaha County, South Dakota)
Built 1938
Through truss bridge over Silver Creek on 255th Street, 3 mi. north and 1 mi. east of Renner
Unknown status

Silver Creek IN 403 Bridge (Clark County, Indiana)
Built ca. 1940; rehabilitated 1976
Through truss bridge over Silver Creek on IN 403
Open to traffic

Sim Smith Covered Bridge (Parke County, Indiana)
Built 1883 by J.A. Britton; rehabilitated 1977
Covered bridge over Leatherwood Creek on CR N50W
Open to traffic

Singer Bridge (Miller County, Missouri)
Built ca. 1910
Through truss bridge over Tavern Creek on Singer Bridge Road (CR 52-60) just off MO 52 near St. Elizabeth
Open to one-lane traffic on a gravel road

Singing Bridge (Franklin County, Kentucky)
Built 1893; rehabilitated 1956
Through truss bridge over Kentucky River on US 60 in Frankfort
Open to traffic

Sinking Creek KY 144 Bridge (Breckinridge County, Kentucky)
Built ca. 1950
Through truss bridge over Sinking Creek on KY 144
Open to traffic

Sixth Street Bridge (Greene County, Arkansas)
Built 1934; rehabilitated 1995; removed sometime after 1997
Lost pony truss bridge over Eight Mile Creek on North Sixth Street in Paragould
No longer exists

Smackover Creek AR 7 Bridge (Union County, Arkansas)
Replaced 1990
Lost pony truss bridge over Smackover Creek on AR 7 (northbound)
Replaced by a new bridge

Smith Covered Bridge (Rush County, Indiana)
Built 1877 by A. M. Kennedy; rehabilitated 1996
Covered bridge over Flatrock River on CR 150 North
Open to traffic

Smith Creek Katy Trail Bridge (Warren County, Missouri)
Through truss bridge over Smith Creek on the Katy Trail just off MO 94
Open to pedestrians and bicyclists only

Smith Creek MO 94 Bridge (Warren County, Missouri)
Built 1934
Pony truss bridge over Smith Creek on MO 94
Open to two-lane traffic

Smithfield Street Bridge (Allegheny County, Pennsylvania)
Built 1883 under the direction of engineer Gustav Lindenthal
Two-span lenticular through truss bridge over Monongahela River on Smithfield Street in Pittsburgh
Open to four lanes of traffic

Smithland Bridge (Livingston County, Kentucky)
Built 1931; rehabilitated 1954
Through truss bridge over Cumberland River on US 60 at Smithland
Open to traffic

Smiths Creek Bridge (Franklin County, Arkansas)
Built 1928 by the Virginia Bridge & Iron Co.; replaced and relocated to a nearby field
Pony truss bridge formerly over Smiths Creek on AR 309
Closed to all traffic

Smoky Hill River Bridge (McPherson County, Kansas)
Through truss bridge over Smoky Hill River on Abandoned Railroad Line
Open to pedestrians

Smoky Hill River Bridge (Dickinson County, Kansas)
Built 1915
Through truss bridge over Smoky Hill River on Oat Road, 2.5 mi. east and 0.8 mi. south of Detroit
Closed to all traffic(?)

Smoky Hill River Bridge (McPherson County, Kansas)
Built 1919; rehabilitated 1989
Through truss bridge over Smoky Hill River on Syensk Road
Open to traffic

Smyrna Road Bridge (Christian County, Missouri)
Built 1912 by the Canton Bridge Co. of Canton, Ohio
Through truss bridge over Finley Creek on Smyrna Road northeast of Ozark
Open to one-lane traffic on a paved road

Snag Creek Bridge (Cedar County, Missouri)
Built ca. 1910
Pony truss bridge over Snag Creek on CR 1101
Open to traffic

Sni-A-Bar Creek Bridge (Lafayette County, Missouri)
Built 1929
Through truss bridge over Sni-A-Bar Creek on MO 224 (Old US 24) at Wellington
Open to traffic

Snow Hill Covered Bridge (Franklin County, Indiana)
Built 1894 by William Butts and John Horn; rehabilitated 1987
Covered bridge over Johnson Fork Whitewater River on Snow Hill Road
Open to traffic

Snyder Covered Bridge (Columbia County, Pennsylvania)
Built 1876
Covered bridge over Roaring Creek on Rarig Road, southeast of Catawissa
Open to traffic

Sonestown Covered Bridge (Sullivan County, Pennsylvania)
Built 1900; rehabilitated 2001
Covered bridge over Muncy Creek on Champion Road (TR 310)
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 Canon Bridge (Garfield County, Colorado)
Built 1914-15 by the Missouri Valley Bridge & Iron Co.
Closed through truss bridge over the Colorado River just off I-70, west of Glenwood Springs
Closed to all 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 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 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 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

Sparks Ferry Bridge (Jackson County, Indiana)
Built ca. 1890; closed to traffic 2006
Two-span through truss bridge over East Fork White River on Sparks Ferry Road
Open to pedestrians only

Spavinaw Creek Railroad Bridge (Benton County, Arkansas)
Lost Waddell "A" through truss bridge over Spavinaw Creek on the KCS Railroad near Gravette
No longer exists

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

Spencer's Crossing Bridge (Anderson County, Kansas)
Built 1885 by the Wrought Iron Bridge Co.; replaced 2005
Through truss bridge over Pottawatomie Creek, 0.6 mi. west and 0.1 mi. north of Greeley
Preserved

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

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 Creek Railroad Bridge (Minnehaha County, South Dakota)
This bridge was part of a plan to convert Split Rock Creek into a lake in the 1950s.
Abandoned lattice through truss bridge over Split Rock Creek on abandoned railroad 0.3 miles east of Split Rock Blvd. near Mc Hardy Park
Abandoned

Spring City Bridge (Rhea County, Tennessee)
Built 1931
Lost through truss bridge over Piney River on US 27/TN 29 in Spring City
No longer exists

Spring Creek 1700N Bridge (Iroquois County, Illinois)
Built 1898
Through truss bridge over Spring Creek on 1700N Road
Closed to all traffic after suffering damage in a car accident

Spring Creek 1900N Bridge (Iroquois County, Illinois)
Built 1916
Through truss bridge over Spring Creek on 1900N Road
Open to 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 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 Road Bridge (Ellis County, Texas)
Built 1890
Through truss bridge over Grove Creek on Spring Creek Road in Waxahachie
Preserved awaiting full restoration

Spring Hill Road Bridge (Christian County, Missouri)
Built 1914 by the Canton Bridge Co.; demolished 2006
Lost through truss bridge over Finley Creek on Spring Hill Road northeast of Sparta
No longer exists

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 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 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

Springdale Covered Bridge (Leavenworth County, Kansas)
Built ca. 1859; rehabilitated 1946
Lost covered bridge over Stranger Creek near Springdale
No longer exists

Springfield Bridge (Faulkner County, Arkansas)
Completed July 1874 by the King Bridge Manufactory & Iron Works of Iola, Kansas, a branch of the King Bridge Co. of Cleveland, Ohio. Bypassed by a new bridge 1991.
Iron bowstring truss bridge over Cadron Creek near Springfield on the Conway-Faulkner County line
Open to pedestrians only

Square Rock Creek AR 28 Bridge (Scott County, Arkansas)
Built 1961; replaced 2003
Lost pony truss bridge over Square Rock Creek on AR 28
Replaced by new bridge

Squaw Creek MO 118 Bridge (Holt County, Missouri)
Built 1928; replaced 2003
Lost pony truss bridge over Squaw Creek on MO 118 southwest of Mound City
No longer exists

Squirrel Bridge (Fremont County, Idaho)
Built during the late 1930's by the Civilian Conservation Corps; replaced 1983
Lost wooden Howe pony truss bridge over Fall River on CCC Camp Road
Replaced by a new bridge

St. Francis River Bridge (Sherburne County, Minnesota)
Built 1915
Through truss bridge over St. Francis River on CR 64
Closed to all traffic

St. Francis River Bridge (Mille Lacs County, Minnesota)
Built ca. 1900
Lost pratt through truss bridge over St. Francis River on Local road at wildlife refuge just off CSAH 5
Removed

St. Francis River Bridge (Madison County, Missouri)
Lost through truss bridge over St. Francis River
No longer exists

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. 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 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 (Fountain County, Indiana)
Built 1963
Pony truss bridge over Coal Creek on State Street in Veedersburg
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

Station Road Bridge (Cuyahoga County, Ohio)
Built 1881-82 by the Massillon Bridge Co.; rehabilitated 1992
Through truss bridge over the Cuyahoga River on Station Road in Cuyahoga Valley National Park
Open to pedestrians only

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

Stephens Bridge (Ouachita County, Arkansas)
Built 1928; rehabilitated 1990
Pony truss bridge over the railroad tracks on AR 57 in Stephens
Closed to all traffic

Stevenson Road Covered Bridge (Greene County, Ohio)
Built 1877 by the Smith Bridge Co.; rehabilitated 1975; closed to traffic 2003
Covered bridge over Massies Creek on Stevenson Road (CR 76) in Wilberforce
Open to pedestrians only

Stewart Covered Bridge (Lane County, Oregon)
Built in 1930 and remained in use until 1982. Due to flood water debris it was then closed. Restored in 1996.
Howe through truss bridge on Garoutte Road
Closed to all 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

Stillwater Covered Bridge (Columbia County, Pennsylvania)
Built 1849 by James McHenry
Covered bridge over Fishing Creek in Stillwater
Open to pedestrians only

Stinson Creek Railroad Bridge (Callaway County, Missouri)
Through truss bridge over Stinson Creek, just off Hickman Avenue in Fulton
Open to pedestrians only

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

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

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 (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 (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