Windom Railroad Bridge (Cottonwood County, Minnesota)
Built 1900, replacing an earlier bridge
Two-span through truss bridge over West Fork Des Moines River on the Union Pacific Railroad at Windom
Open to railroad traffic

Windsor Harbor Bridge (Jefferson County, Missouri)
Originally built 1875 by the Keystone Bridge Co. over River Des Peres at Lemay Ferry in St. Louis. Relocated to Kimmswick in 1930; bypassed by new bridge in 1985.
Wrought-iron through truss over Rock Creek at Kimmswick in Imperial
Open to pedestrians only

Windsor Mills Covered Bridge (Ashtabula County, Ohio)
Built 1867; reconstructed 2004
Covered bridge over Phelps Creek on Warner Hollow Road
Open to traffic

Winnebago River Bridge (Floyd County, Iowa)
Built 1925; rehabilitated 1957
Through truss bridge over Winnebago River on 200th Street (CR B43) northwest of Rockford
Open to traffic

Witherspoon Bridge (Hot Spring County, Arkansas)
Lost two-span through truss bridge over Ouachita River on CR 647
Replaced by a modern bridge in 1994

Wittenberg Railroad Bridge (Perry County, Missouri)
This railroad line was completed in 1904, although I don't know if this particular bridge is that old or not
Through truss bridge over Brazeau Creek at Wittenberg on the Burlington Northern Santa Fe railroad
Still in use

Wolf Bayou Bridge (Pulaski County, Arkansas)
Built 1924
Lost pony truss bridge over Wolf Bayou on CR 85 (Old AR 30) in Scott
Replaced by a new bridge

Wolf Creek Bridge (Franklin County, Kansas)
Built 1925; replaced 2002
Lost pony truss bridge over Wolf Creek on a local road
No longer exists

Wolf River Bridge (Outagamie County, Wisconsin)
Built 1949
Three-span continuous pony truss bridge over Wolf River on CTH S
Open to traffic

Wolf River Bridge (Langlade County, Wisconsin)
Built 1936; rehabilitated 1967
Through truss bridge over Wolf River on WI 52
Open to traffic

Wolverine Creek Bridge (Bourbon County, Kansas)
Lost Pony truss bridge over Wolverine Creek, 2.8 mi. south of Hammond
Closed to all traffic

Wood Ford Drive Bridge (Washington County, Wisconsin)
Built 1891; rehabilitated 1979
Through truss bridge over Milwaukee River on Wood Ford Drive
Closed to all traffic

Woodland Bridge (Iroquois County, Illinois)
Built 1911
Through truss bridge over Sugar Creek on 2100E Road near Woodland, .5 mi. north of Woodland
Open to traffic

Woodside Road Bridge (Sevier County, Arkansas)
Built 1912; replaced 2003
Lost pony truss bridge over Saline River on Woodside Road (Sevier CR 23)
Replaced by new train car chassis bridge

Woolsey Bridge (Washington County, Arkansas)
Built 1925
Two-span through truss bridge over West Fork White River on CR 35
Closed to all traffic Sept. 2007

Wyaconda River Bridge (Lewis County, Missouri)
Lost(?) through truss bridge over Wyaconda River somewhere near La Grange
No longer exists

Wyman Bridge (Washington County, Arkansas)
Built 1908 by the Vincennes Bridge Co.; replaced 2002
Lost through truss over White River on CR 48 (Wyman Road) east of Fayetteville in Fayetteville
Replaced by a new bridge

Yashau Creek Bridge (McCurtain County, Oklahoma)
Built 1936
Pony truss bridge over Yashau Creek on US 70
Open to traffic

Yates Avenue Bridge (Marshall County, Iowa)
Built ca. 1900
Pony truss bridge over the Union Pacific Railroad (formerly Chicago & Northwestern Railroad) on Yates Avenue
Open to traffic

Yazoo River US 82 Bridge (Leflore County, Mississippi)
Built 1954
Through truss bridge over Yazoo River on US 82 in Greenwood
Open to traffic

Yellowstone River Bridge (Stillwater County, Montana)
Built 1931
Through truss bridge over Yellowstone River on Frontage Road 115
Open to traffic

Yorktown Bridge (Lincoln County, Arkansas)
Lost pony truss bridge over Bayou Bartholomew on AR 13 (now US 425) at Yorktown, north of Star City
Replaced by a new bridge in 1948

Youngs Creek Bridge (Orange County, Indiana)
Built 1935
Pony truss bridge over Youngs Creek on CR 350 West
Open to traffic

Youngstown-Poland Road Bridge (Lawrence County, Pennsylvania)
Built 1936 by the Fort Pitt Bridge Works
Through truss bridge over Mahoning River on US 224/PA 551 (Youngstown-Poland Road)
Open to traffic

Zack Wheat Drive Bridge (Caldwell County, Missouri)
Pony truss bridge over Long Creek on S.W. Zack Wheat Drive
Open to traffic

Zacke Cox Covered Bridge (Parke County, Indiana)
Built 1908 by J.A. Britton; rehabilitated 1991 and 2002
Covered bridge over Rock Run Creek on CR 500 South
Open to one-lane traffic

Zalma Bridge (Bollinger County, Missouri)
Built 1929-30, replacing a 1900 span that was then moved to Gipsy
Through truss bridge over Castor River on MO 51 at Zalma
Open to one-lane traffic on a paved road

Zane Gray Bridge (Muskingum County, Ohio)
Originally built 1909 by the Mt. Vernon Bridge Co. over Salt Creek on Wheeling Road (TR 442). Relocated 2000.
Pony truss bridge on the grounds of the National Road/Zane Gray Museum, east of Zanesville
Open to pedestrians only

Zinni Bridge (Carroll County, Indiana)
Built 1945
Through truss bridge over Wildcat Creek on Prince William Road
Currently undergoing repairs through mid-April 2006

Zion Bridge (Madison County, Missouri)
Built 1922
Pony truss bridge over Twelvemile Creek at Zion on CR 417 (Old US 67)
Open to traffic

Zumbrota Covered Bridge (Goodhue County, Minnesota)
Originally built 1869; relocated in 1932, 1970, and finally 1997
Relocated covered bridge over North Fork Zumbro River in Zumbrota
Open to pedestrians only

Zurich Street Bridge (Will County, Illinois)
Built ca. 1890 by the Chicago & Alton Railroad; replaced 1998
Lost timber pony truss bridge over the UPRR on Zurich Street near Joliet
Replaced by modern bridge