San Gabriel Blvd over Rubio Wash (Los Angeles County, California)
Built 1914; rehabilitated 1925
Bridge over Rubio Wash on San Gabriel Blvd in San Gabriel
Open to traffic

San Gabriel Canyon Road over the San Gabriel River (Los Angeles County, California)
Built 1933
Deck truss bridge over San Gabriel River on CA 39 in Azusa
Open to traffic

San Gabriel River Parkway over the San Gabriel River (Los Angeles County, California)
Built 1954
Concrete tee beam bridge over San Gabriel River on San Gabriel Riv Pk in Pico Rivera
Open to traffic

San Pascual Ave Over the Arroyo Seco (Los Angeles County, California)
Built 1939
Bridge over Arroyo Seco Channel on San Pascual Ave Br in Los Angeles
Open to traffic

San Rafael Avenue over the Arroyo Seco (Los Angeles County, California)
Built 1922
Concrete arch bridge over Arroyo Seco Channel on San Rafael Avenue in Pasadena
Open to traffic

Sand Creek IN 3 Bridge (Jennings County, Indiana)
Built 1935; rehabilitated 1982
Through truss bridge over Sand Creek on IN 3
Open to traffic

Sand Creek US 31 Bridge (Jackson County, Indiana)
Built 1936; rehabilitated 1995
Through truss bridge over Sand Creek on US 31
Open to traffic

Sandy Creek CR 404 Bridge (Cape Girardeau County, Missouri)
Built 1918; rehabilitated in 1981
Small plank bridge on CR 404 over Sandy Creek east of Friedheim
Open to one-lane traffic on a gravel road

Sandy Creek MO 79 Bridge (Lincoln County, Missouri)
Built 1938
Through truss bridge over Sandy Creek on MO 79 near Foley
Open to traffic

Sangamon River Bridge (Sangamon County, Illinois)
Built ca. 1950
Two-span through truss bridge over Sangamon River on TR 171, 2.0 mi. east of Clear Lake
Open to traffic

Santa Fe Avenue Bridge (Pueblo County, Colorado)
Built 1924 by the Pueblo Bridge Co.
Through truss bridge over the Arkansas River on eastbound US 50 (Santa Fe Avenue) in Pueblo
Open to two lanes of traffic

Santiam Railroad Bridge (Marion County, Oregon)
Built 1906
Pratt through truss bridge over Santiam River on Union Pacific Railroad in Jefferson
Open to traffic

Sappington Branch Bridge (Moniteau County, Missouri)
Built 1925
Tee beam bridge over Sappington Branch on Old US 50, west of California
Open to traffic

Sauk Creek Bridge (Ozaukee County, Wisconsin)
Built 1915; rehabilitated 1928
Concrete arch bridge over Sauk Creek on Grand Avenue (WI 32) in Port Washington
Open to traffic

Saville Covered Bridge (Perry County, Pennsylvania)
Built 1903
Covered bridge over Buffalo Creek on PA 4001
Open to traffic

Scenic Bridge (Mineral County, Montana)
Built 1928; rehabilitated 1965
Deck truss bridge over Clark Fork on Old US 10 (CR 012)
Open to traffic

Schiller Avenue Bridge (Jefferson County, Kentucky)
Built 1914
Concrete arch bridge over South Fork Beargrass Creek on Schiller Avenue in Louisville
Open to traffic

Schomberg Road Bridge (Warren County, Missouri)
Built 1908
Bedstead pony truss bridge over Water Run Creek on Schomberg Road
Open to one-lane traffic

Scioto River CR 4 Bridge (Pickaway County, Ohio)
Built 1914 by the Oregonia Bridge Co.; rehabilitated 1983
Through truss bridge over Scioto River on CR 4
Open to traffic

Scioto-Darby Road Bridge (Pickaway County, Ohio)
Built 1910 by the The Oregonia Bridge Co., Lebanon, Oh.; rehabilitated 1986
Through truss bridge over Big Darby Creek on Scioto-Darby Road (CR 22)
Open to traffic

Scipio Covered Bridge (Jennings County, Indiana)
Built 1886; rehabilitated 1984
Covered bridge over Sand Creek on CR 575W
Open to traffic

Scott County Road 224 Bridge (Scott County, Missouri)
Wooden stringer bridge over a branch of Caney Creek on CR 224 northeast of New Hamburg
Open to one-lane traffic

Scottsboro Bridge (Jackson County, Alabama)
Built 1930
Cantilevered through truss bridge over Tennessee River on AL 35 at Scottsboro
Open to traffic

SE 14th St. Bridge (Polk County, Iowa)
Built 1936; rehabilitated 1973
Steel stringer bridge over Des Moines River on US 69 in Des Moines
Open to traffic

Seaford Bridge (Sussex County, Delaware)
Built 1925 by the Chicago Bascule Bridge Co.
Bascule bridge over Nanticoke River on Front Street in Seaford
Open to traffic

Sebree Bridge (Jackson County, Missouri)
Built 1923; rehabilitated 1983
Three-span open-spandrel arch bridge over Brush Creek on Benton Blvd. in Kansas City
Open to traffic

Second Avenue Bridge (Linn County, Iowa)
Built 1906 by the Marsh Bridge Co.; reconstructed 1965
Open-spandrel arch bridge over Cedar River on Second Avenue in Cedar Rapids
Open to four lanes of one-way westbond traffic

Second Clark Lane Bridge (Union County, Illinois)
Built 1977
Wooden deck bridge over a branch of Dutch Creek on Clark Lane (TR 72)
Open to one-lane traffic with a 7 ton weight limit

Second Creek Road Bridge (Clay County, Missouri)
Built or relocated here ca. 1970
Pony truss bridge over Second Creek on Second Creek Road at Smithville
Open to two-lane traffic

Second Hannibal Bridge (Jackson County, Missouri)
Built 1917 to replace First Hannibal Bridge; auto deck abandoned 1956
Through truss bridge over Missouri River on the BNSF Railroad in Kansas City
Open to railroad traffic

Second Mill Creek Bridge (Reynolds County, Missouri)
Built 1921
Concrete slab bridge with ballusters on CR 360 (Old MO 21) east of Lesterville
Open to traffic with a 5 ton weight limit

Second Street Bridge (Jefferson County, Missouri)
Concrete bridge over Tanyard Branch on Second Street in De Soto
Open to two-lane traffic

Second Street Bridge (Allen County, Ohio)
Closed-spandrel arch bridge over Flat Fork on 2nd Street in Delphos
Open to traffic

Second Street Bridge (Bartholomew County, Indiana)
Built 1999
Cable-stayed bridge over East Fork White River on IN 46
Open to traffic

Sedgewickville Bridge (Bollinger County, Missouri)
Built 1936
Three-span pony plate-girder bridge over Whitewater River on Route K north of Sedgewickville
Open to two-lane traffic

Seigrist's Mill Covered Bridge (Lancaster County, Pennsylvania)
Built 1885
Covered bridge over Big Chickies Creek on Seigrist Road
Open to traffic

Seilbeck Road Bridge (Massac County, Illinois)
Wooden bridge over the ICRR on Seilbeck Road (TR 93) north of Metropolis
Open to one-lane traffic

Seisemore Road Bridge (Deschutes County, Oregon)
Built 1914
Concrete arch bridge over Tumalo Irrigation Canal on Seisemore Road
Open to traffic

Selah Creek Bridge (Yakima County, Washington)
Built 1971
Concrete arch bridge over Selah Creek on I-82
Open to traffic

Self Creek US 70 Bridge (Pike County, Arkansas)
Built 1949 by the D.F. Jones Construction Co. of Little Rock
Three-span open-spandrel arch bridge over Self Creek (Greeson Lake) on US 70 in Daisy
Open to traffic

Seligman Railroad Underpass (Barry County, Missouri)
Small stone and brick arch bridge over FM 2295 on the Arkansas-Missouri Railroad at the south end of Seligman in Seligman
Open to one very narrow lane of traffic

Sellwood Bridge (Multnomah County, Oregon)
Built 1925
Deck truss bridge over Willamette River on Tacoma Street in Portland
Open to traffic

SEMO Port Railroad Bridge (Cape Girardeau County, Missouri)
Through truss bridge over the Diversion Channel on the SEMO Port Railroad south of Cape Girardeau
Open to railroad traffic

Seneca Bridge (La Salle County, Illinois)
Built 1932; rehabilitated 1986
Four-span through truss bridge over the Illinois River on IL 170 at Seneca
Open to two-lane traffic

Seneca Park Road (Jefferson County, Kentucky)
Built ca. 1930
Concrete arch bridge over Middle Fork Beargrass Creek on Seneca Park Road in Louisville
Open to traffic

Service Road Bridge (Cuyahoga County, Ohio)
Built 1922 by the King Bridge Co.
Through truss bridge over the Cuyahoga River on a service road within the Cuyahoga Valley National Park
Open to authorized National Park vehicles only

Seven Mile Creek TR 331 Bridge (Preble County, Ohio)
Built 1906 by the Indiana Bridge Co. of Muncie, In.
Through truss bridge over Seven Mile Creek on TR 331
Open to traffic

Seven Mile Creek TR 333 Bridge (Preble County, Ohio)
Built 1931 by the Brookville Bridge Co. of Brookville, Oh.
Through truss bridge over Seven Mile Creek on TR 333
Open to traffic

Seven Stone Arches Bridge (St. Francois County, Missouri)
Built 1932 by the Works Progress Administration
Seven stone arch spans over Terre Bleue Creek on Hillsboro Road
Open to traffic with a 15 ton weight limit

Sevenmile Bridge (Mineral County, Colorado)
Built 1935; relocated 1981
Deck truss bridge over the Rio Grande at the entrance to Marshall Park Campground, just off CO 149
Open to traffic

Seventh Avenue Bridge (Langlade County, Wisconsin)
Built 1935
Stringer bridge over Spring Brook on 7th Avenue in Antigo
Open to traffic

Seventh Street over the Los Angeles Rivers (Los Angeles County, California)
Built 1910, Second Deck added 1927, Seismic Retrofit 1995
Concrete arch bridge over Los Angeles River on Seventh Street in Los Angeles
Open to traffic

Severn Creek KY 355 Bridge (Owen County, Kentucky)
Built 1942
Through truss bridge over Severn Creek on KY 355
Open to traffic

Sewell Bridge (Ripley County, Missouri)
Built 1924, but may have been moved to this location from elsewhere
Pony truss bridge over Little Black River on CR H-5, just north of Hemenway Bridge
Open to traffic

Shackelford Bridge (Cooper County, Missouri)
Built 1913
Through truss bridge over Lamine River on Shackelford Bridge Road
Open to traffic

Shady Lake Bridge #2 (Polk County, Arkansas)
This is a two span single lane stone clad bridge. There is a single span of identical design nearby. CCC built several recreation areas in the vicinity ca. 1937 ~40
Stone arch bridge over East Saline Creek on Forest Service Campground Road
Open to traffic

Shady Lake Stone Bridge #1 (Polk County, Arkansas)
Built ca. 1937 by CCC along with a dam, care takers house & pavilion. A two span sister bridge is nearly. Stone guardrails may have been added later or were a replacement.
Stone arch bridge over South Fork Saline River on Forest Service Rd. #38
Open to traffic

Shamrock Lane Bridge (Waukesha County, Wisconsin)
Built 1988
Concrete arch bridge over Butler Ditch on Shamrock Lane in Brookfield
Open to traffic

Shasta River Bridge (Siskiyou County, California)
Built 1928
Concrete tee beam bridge over Shasta River on State Route 263
Open to traffic

Shasta River Bridge (Siskiyou County, California)
Built 1931
Concrete arch bridge over Shasta River on CA 263
Open to traffic

Shaw Road Bridge (Jones County, Iowa)
Built 1924; rehabilitated 1954
Two-span through truss bridge over Wapsipinicon River on Shaw Road
Open to traffic

Shawnee Bridge (Warren County, Indiana)
Built 1905; rehabilitated 1980
Through truss bridge over Wabash River on CR 100 East
Open to traffic

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)
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

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 (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 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 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