Shawnee Ford Bridge (Franklin County, Missouri)
Built ca. 1920; rehabilitated 1990
Through truss bridge over Bourbeuse River on Shawnee Ford Road beyond the end of Route AN
Open to one-lane traffic with a 19 ton weight limit

Sheboygan River Bridge (Sheboygan County, Wisconsin)
Built 1995
Bascule bridge over Sheboygan River on S. 8th Street in Sheboygan
Open to traffic

Shelbyville Cemetery Bridge (Shelby County, Illinois)
Wooden deck bridge over a gulley in Shelbyville Cemetery
Open to traffic

Shell Rock Bridge (Butler County, Iowa)
Built 1915
Three-span arch bridge over Shell Rock River on Cherry Street in Shell Rock
Open to traffic

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 Crossing (Floyd County, Iowa)
Built 1938
Bridge over Shell Rock River on Local road
Open to traffic

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

Shepperds Dell Bridge (Multnomah County, Oregon)
Built 1914
Concrete arch bridge over Shepperds Dell on Historical Columbia River Highway
Open to traffic

Sherman Avenue Crossing (Dane County, Wisconsin)
Built 1934; rehabilitated 2003
Stringer bridge over Yahara River on Sherman Avenue in Madison
Open to traffic

Sherman Beach Railroad Bridge (St. Louis County, Missouri)
Plate girder bridge over Meramec River on the Union Pacific Railroad near Sherman Beach in Wildwood
Open to railroad traffic

Sherman Minton Bridge (Jefferson County, Kentucky)
Built 1961; rehabilitated 1997
Double Decker Two-span steel through arch bridge over Ohio River on I-64 between New Albany and Louisville in Louisville
Open to traffic

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

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

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

Short Road Bridge No. 1 (Morgan County, Missouri)
Built 1920
Concrete girder bridge over Straight Fork on Short Road (Old MO 5)
Open to traffic

Short Road Bridge No. 2 (Morgan County, Missouri)
Built 1920
Concrete bridge over a branch of Straight Fork on Short Road (Old MO 5)
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

Side Street Bridge (Johnson County, Illinois)
Wooden bridge over the Union Pacific Railroad on E. Side Street in Goreville, just off IL 37
Open to one-lane traffic with a 3 ton weight limit

Sidney Road Bridge (Sharp County, Arkansas)
Built ca. 1945
Small two-span arch bridge over an unnamed creek on Sidney Road (CR 1)
Open to traffic

Sierra Highway over UPRR (Los Angeles County, California)
Built 1911; rehabilitated 1934
Concrete tee beam bridge over Metrolink & Up Rr on Sierra Hwy in Los Angeles
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 (Chase County, Kansas)
Stone arch bridge over Silver Creek, 1.0 mi. north and 0.5 mi. east of Clements
Open to traffic

Silver Creek Bridge (Minnehaha County, South Dakota)
Built 1935; rehabilitated 1967
Steel stringer bridge over Silver Creek on 258 Th Street, 0.3 miles W of SD 115
Open to traffic

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

Simstown Road Bridge (Sharp County, Arkansas)
Built ca. 1935 by the Civilian Conservation Corps
Small three-span arch bridge over an unnamed creek on Simstown Road (CR 42)
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 Bridge (Shannon County, Missouri)
Built 1925
Three-span open-spandrel arches over Sinking Creek on MO 19 north of Round Spring
Open to traffic on a paved road, but scheduled for future rehabilitation

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

Sinsabaugh Little Black River Bridge (Ripley County, Missouri)
Built ca. 1940
Plank span over Little Black River on CR H-10 west of Sinsabaugh
Open to traffic on a gravel road

Sistersville Ferry (Tyler County, West Virginia)
In continuous operation since 1815
Ferry crossing over the Ohio River between Sistersville, West Virginia, and Fly, Ohio
Toll ferry open to traffic

Siuslaw River Bridge (Lane County, Oregon)
Built 1936; rehabilitated 1977
Bascule bridge over Siuslaw River on US 101 in Florence
Open to traffic

Sixteenth Avenue Bridge (Linn County, Iowa)
Built 1989
Stringer bridge over Cedar River on 16th Avenue in Cedar Rapids
Open to traffic

Sixth Street / Whittier Blvd over the Los Angeles River (Los Angeles County, California)
Built 1932
Steel arch bridge over Los Angeles River on Sixth Street in Los Angeles
Open to traffic

Sixth Street Bridge (Minnehaha County, South Dakota)
Built 1975
Bridge over Big Sioux Rv on Sixth Street E of Phillips Ave. in Sioux Falls
Open to traffic

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

Skiberene Bridge (Clatsop County, Oregon)
Built 1930
Stringer bridge over Necanicum River on U.S. 101/U.S. 26
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

Slagle Creek Bridge (Bollinger County, Missouri)
Built ca. 1925 by Miller & Borcherding Bridge Builders of St. Louis, the company that built Hargrove Bridge using the same patented truss design
Pony truss bridge over Slagle Creek on CR 714 near the intersection with CR 720 southwest of Arab
Open to traffic on a gravel road with a 4 ton weight limit

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

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

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 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 River Bridge (Merrimack County, New Hampshire)
Built 1999
Slab bridge over Smith River on Old Nh 3a
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

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 K-147 Bridge (Trego County, Kansas)
Built 1952; rehabilitated 1993
Steel through arch over Smoky Hill River on K-147 at Cedar Bluff Lake Spillway
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

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

Soledad Canyon Road over the Santa Clara River (Los Angeles County, California)
Built 1952
Steel stringer bridge over Santa Clara River on Soledad Cyn Road
Open to traffic

Soledad Canyon Road over UPRR Tracks (Los Angeles County, California)
Built 1938
Rainbow arch bridge over UP Railroad on Soledad Canyon Road
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

Sonora Road Bridge (Preble County, Ohio)
Built 1902
Through truss bridge over Twin Creek on TR 455
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

Soto Street over Huntington Drive South (Los Angeles County, California)
Built 1936
Girder bridge over Mission Rd-Huntington So on Soto Street in Los Angeles
Open to traffic

Soto Street over Valley Blvd. (Los Angeles County, California)
Built 1936
Steel stringer bridge over Valley Blvd/Sptco on Soto Street in Los Angeles
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 Branch Little Wolf River Bridge (Waupaca County, Wisconsin)
Built 1907
Stone arch bridge over South Branch Little Wolf River on Mill Street in Scandinavia
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 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 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 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 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 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 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 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 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 Hamma Hamma River Bridge (Mason County, Washington)
Built 1924
Rainbow arch bridge over Hamma Hamma River on US 101
Open to traffic