Shell Rock River Bridge (Cerro Gordo County, Iowa)
Built ca. 1950
Through truss bridge over Shell Rock River on a local road
Open to traffic

Shell Rock River Bridge (Cerro Gordo County, Iowa)
Built 1927; replaced 2003
Lost through truss bridge over Shell Rock River on a local road
No longer exists

Shell Rock River Bridge at Northwood (Worth County, Iowa)
Pratt pony truss bridge over Shell Rock River on pedestrian trail at Hurd Park in Norwood
Open to pedestrians

Shenk's Mill Covered Bridge (Lancaster County, Pennsylvania)
Built 1855; rehabilitated 1977
Covered bridge over Big Chickies Creek on Erisnan Road
Open to traffic

Sheridan Road Bridge (Saginaw County, Michigan)
Built 1923; Replaced 1993
Lost Pratt through truss bridge over Flint River on Sheridan Road in Taymouth Township
Replaced by new bridge

Sherwood Road Bridge (Cass County, Missouri)
Pony truss bridge over Big Creek on Sherwood Road
Open to traffic

Sheyenne River Bridge (Griggs County, North Dakota)
Built 1912
Through truss bridge over Sheyenne River on a county highway, 1 mi. east and 8 mi. north of Cooperstown in Romness Township
Open to traffic

Shieldstown Covered Bridge (Jackson County, Indiana)
Built 1876 by J.J. Daniels
Covered bridge over East Fork White River
Open to pedestrians only

Shinn Covered Bridge (Washington County, Ohio)
Built 1886 by E.B. Henderson; rehabilitated 1998
Covered bridge over West Branch Wolf Creek on Palmer Road (TR 447)
Unknown status

Shippingsport Bridge (La Salle County, Illinois)
Lost 7 span through truss vertical lift bridge, replaced with a modern span.
Lost through truss bridge over Illinois River on once carried US 51 and later IL 351
Replaced by new bridge

Shirley AR 9 Bridge (Van Buren County, Arkansas)
Lost through truss bridge over Middle Fork Little Red River on AR 9 at Shirley
Replaced by a new bridge in 1960

Shirley Bridge (Van Buren County, Arkansas)
Built 1908 by the Wisconsin Bridge & Iron Co. as a railroad bridge; rehabilitated 1988
Through truss bridge over Middle Fork Little Red River on River Road (CR 125) just outside of Shirley in Shirley
Open to one-lane traffic

Shoemaker Covered Bridge (Columbia County, Pennsylvania)
Built 1881
Covered bridge over West Branch Run on Shoemaker Bridge Road (PA 4027)
Open to pedestrians only

Short Mountain Creek Bridge (Logan County, Arkansas)
Built 1928 by the Virginia Bridge & Iron Co.; rehabilitated 1976
Pony truss bridge over Short Mountain Creek on CR 64
Open to traffic

Short Road Bridge (Montgomery County, Missouri)
Built ca. 1910
Through truss bridge over Loutre River on Short Road
Open to traffic

Shreveport Railroad Bridge (Bossier Parish, Louisiana)
Rail bridge over Red River in Shreveport. Rail line is active. Build date unknown.
Through truss bridge over Red River on railroad in Shreveport
Open to traffic

Siam Steel Bridge (Carter County, Tennessee)
Built 1941
One lane, two-span Pratt Truss bridge over Watauga River on Steel Bridge Road (County Road 1011)
One lane bridge, open to traffic

Sibley Railroad Bridge (Jackson County, Missouri)
Originally built 1887-88 as a three-span Whipple through truss; later reconstructed with Parker through truss spans
Three-span through truss railroad bridge over the Missouri River at Sibley
Open to railroad traffic

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; Reopened Nov 2007
Three-span through truss bridge over Mulberry River on CR 67 (Wire Road) just north of I-40 in Mulberry
Open to traffic with 3 Ton weight Limit

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

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

Sixth Street Viaduct (Des Moines County, Iowa)
Built 1996; Enhanced 1903; Replaced 1993
Lost Pratt through truss bridge over Over BNSF Railroad & Valley Street on 6th Street in Burlington
Replaced by new bridge

Skalall Creek Bridge (Tulsa County, Oklahoma)
Built ca. 1910
Pony truss bridge over Skalall Creek on 176th St. N. (E0420) in Skiatook
Open to traffic

Skillet Fork Bridge (Marion County, Illinois)
Built 1915
Through truss bridge over Skillet Fork on CH 30
Open to traffic

Skillet Fork Bridge (Marion County, Illinois)
Built 1946
Through truss bridge over Skillet Fork Creek on FAS 795, 1 mi. west of Helm
Open to traffic

Slough Creek Bridge (Jefferson County, Kansas)
Built 1923
Pony truss bridge over Slough Creek on McCall Drive, 1.9 mi. north of Oskaloosa
Open to traffic

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

Smalling Bridge (Carter County, Tennessee)
Built 1941
Pratt Truss bridge over Watauga River on Smalling Road
Open to traffic, one-lane bridge

Smart Ditch Bridge (Jackson County, Indiana)
Through truss bridge over Smart Ditch on CR 600 East
Open to traffic

Smiley Bayou Bridge (Yell County, Arkansas)
Built 1924 by the International Steel & Iron Co.
Abandoned through truss bridge over Smiley Bayou on CR 5
Abandoned

Smith Branch MO 161 Bridge (Montgomery County, Missouri)
Built 1934
Pony truss bridge over Smith Branch on MO 161
Open to traffic

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

Smith Creek Road Bridge (Moniteau County, Missouri)
Built ca. 1930
Pony truss bridge over Smith Creek on Smith Creek Road southwest of California
Open to traffic

Smith Road Bridge (Rock County, Wisconsin)
Built 1910
Single lane Pratt through truss bridge over Turtle Creek on Smith Road
Open to traffic

Smithfield Bridge (Delaware County, Indiana)
Built 1902
Through truss bridge over White River on CR 170 South
Open to 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 (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

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

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

Sni-A-Bar Creek Route D Bridge (Lafayette County, Missouri)
Built 1934
Pony truss bridge over Sni-A-Bar Creek on Route D
Open to traffic

Sni-A-Bar Creek Route H Bridge (Jackson County, Missouri)
Built 1929
Pratt through truss bridge over Sni-A-Bar Creek on Route H
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

Snowden Bridge (Richland County, Montana)
Built 1914; retrofitted to also allow vehicular toll traffic in 1925
Vertical-lift through truss bridge over the Missouri River on the BNSF Railroad
Open to railroad traffic

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

Sock Road Bridge (Dodge County, Wisconsin)
Built 1893; Demolished 1980
Lost Pratt through truss bridge over Beaver Dam River on Sock Road in Town of Lowell
Demolished 1980, replaced by new bridge

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

Sonora Road Bridge (Preble County, Ohio)
Built 1902
Through truss bridge over Twin Creek on TR 455
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 County Line Road Bridge (Montcalm County, Michigan)
Built 1880; Replaced 1996; Relocated
Relocated Pratt through truss bridge that was over Flat River on South County Line Road near Greenville
Relocated to Fred Meijer Heartland Trail and replaced by new bridge

South Deer Creek Bridge (Douglas County, Oregon)
Built 1967
Truss bridge over South Deer Creek on CR 16
Open to 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 and 2007
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 307A, 7 mi. east of Morrisonville
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 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 Creek Bridge (Fayette County, Illinois)
Built ca. 1930; rehabilitated 1950
Pony truss bridge over South Fork Creek on TR 189, 6 mi. north of Brownstown
Open to traffic

South Fork Holston River CSX Railroad Bridge (Sullivan County, Tennessee)
Built in 1907 as part of first segment of the South & Western RR, later the Carolina, Clinchfield & Ohio, later the Clinchfield, now the CSX Railroad
Howe Truss railroad bridge over the South Fork Holston River on the CSX (formerly Clinchfield) Railroad
Open to rail traffic

South Fork Main City Road Bridge (Cass County, Missouri)
Built ca. 1920
Bedstead Pony truss bridge over South Fork on Main City Road
Closed to all traffic

South Fork Powder River Bridge (Johnson County, Wyoming)
Built 1932
Deck truss bridge over South Fork Powder River on I-25 West Service Road (Old US 87) at Milepost 246.30
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 Fork Wolf River Bridge (Brown County, Kansas)
Built ca. 1940
Pony truss bridge over South Fork Wolf River, 1.3 mi. east and 4.5 mi. north of Everest
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 Holston River Bridge (Sullivan County, Tennessee)
Built 1950
Subdivided Warren through truss bridge over South Holston River on U.S. 421 (State Highway 34)
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 Umpqua River Bridge (Douglas County, Oregon)
Replaced 2000
Lost Through truss bridge over South Umpqua River on CR 387 in Dillard
Built in 1939, Replaced by new bridge in 2000

South Umpqua River I-5 Bridge (Douglas County, Oregon)
Built 1965; rehabilitated 1983
Deck truss bridge over South Umpqua River on Southbound I-5
Open to traffic

Southwest Fifth Street Bridge (Polk County, Iowa)
Built 1898 by J.H. Killmar; closed to traffic in 1993; rehabilitated 1998
Three-span through truss bridge over Raccoon River on SW 5th Street in Des Moines
Open to pedestrians only

Spalding Bridge (Menominee County, Michigan)
Built 1918; Moved 1934; Altered in 1988; Replaced 1995; Relocated 1997
Relocated Pratt pony truss bridge over Big Cedar River on Old US 2/Old US 41 in Spalding
Replaced by new bridge; Relocated 1997

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