Question: In which county in the state where Motley Slough Bridge is located is Waterford?

full_context: Document 1: Coldwater, Mississippi: Coldwater is a small town in Tate County, Mississippi. It is in the Memphis Metropolitan Area. The population was 1,674 at the 2000 census.
Document 2: Midway, Tallahatchie County, Mississippi: Midway is a ghost town in Tallahatchie County, Mississippi, United States. Midway was located on the Cassidy Bayou east-northeast of Sumner.
Document 3: Alden Bridge: The Alden Bridge is a historic bridge in Alden, Iowa, which carries the town's Main Street over the Iowa River. The concrete bridge is long and consists of two spans. It was built in 1936 to replace an earlier wooden bridge that had begun to deteriorate. The Weldon Brothers Construction Co. supervised the bridge's construction, while the Iowa State Highway Commission designed the structure; it was one of the first bridges designed by the ISHC, which used similar plans for many other bridges in the state. Labor for the construction effort came from the Works Progress Administration, providing jobs for many of Hardin County's unemployed residents. The bridge was dedicated on July 4, 1936, as part of Alden's Independence Day celebrations.
Document 4: DeSoto Bridge: DeSoto Bridge was a trussed deck-arch bridge that spanned the Mississippi River in St. Cloud, Minnesota. It was built in 1958 by the Minnesota Department of Transportation. The bridge was painted black, which is typical for railroad bridges but unusual for a highway bridge. The river banks on either side are relatively high, so the bridge required deep trusses which arched over the river.
Document 5: Theodore J. Hoover Natural Preserve: Theodore J. Hoover Natural Preserve, which includes Waddell Marsh, is located at the mouth of Waddell Creek, a coastal freshwater marsh that is one of the rarest habitats on the Central Coast of California. This marsh is one of the few relatively undisturbed bodies of fresh water left along the West coast. The land is 23 acres of wetland habitat. It is part of the Rancho del Oso Big Basin Redwoods State Park, located approximately 65 miles south of San Francisco. The elevation in the park ranges from sea level to over 2,000 feet. The area was named after William W. Waddell, who established the last of his four sawmills there in 1868. The sawmill ran down after his death in 1875. All the boilers were left in the area; they are now completely surrounded by second-growth redwoods. Other trees found in the park are conifers, and oaks. Within the park there are different vegetation types to be seen, such as chaparral, redwood forests, and riparian habitats.
Document 6: Oakland County International Airport: Oakland County International Airport is a county-owned public-use airport located in Waterford Township, Oakland County, Michigan, United States. The airport is located approximately 1 mile from the center of Waterford Township and Oakland County. It is included in the Federal Aviation Administration (FAA) National Plan of Integrated Airport Systems for 2017–2021, in which it is categorized as a non primary commercial service facility.
Document 7: Motley Slough Bridge: Motley Slough Bridge is a small bridge designated a Mississippi Landmark and on the U.S. National Register of Historic Places, located in Lowndes County, Mississippi. It is a single span iron Pratt pony truss bridge built in 1920. It "embodies the distinctive characteristics of a type, period or method of construction.".
Document 8: Florewood State Park: Florewood State Park, also known as Florewood River Plantation State Park, is a closed public recreation area in the U.S. state of Mississippi. The state park is located off U.S. Highway 82 on the western edge of Greenwood.
Document 9: Fort Madison Toll Bridge: The Fort Madison Toll Bridge (also known as the Santa Fe Swing Span Bridge for the old Santa Fe rail line) is a tolled, swinging truss bridge over the Mississippi River that connects Fort Madison, Iowa, and unincorporated Niota, Illinois. Rail traffic occupies the lower deck of the bridge, while two lanes of road traffic occupy the upper deck. The double-decker bridge, which is about a mile long with a swing span of , was the longest and largest double-deck swing-span bridge in the world at the time it was built. Completed in 1927, it replaced an inadequate combination roadway/single-track bridge completed in 1887. The main river crossing consists of four Baltimore through truss spans and a swing span made of two equal arms, long. In 1999, it was listed in the National Register of Historic Places under the title, Fort Madison Bridge, ID number 99001035. It was also documented by the Library of Congress Historic American Engineering Record, survey number HAER IA-62. Construction and photographic details were recorded at the time in "Scientific American" magazine.
Document 10: Mark Morris Memorial Bridge: The Mark Morris Memorial Bridge (locally called the North Bridge) is a 2 lane truss bridge across the Mississippi River in the United States. It connects the cities of Clinton, Iowa and Fulton, Illinois. The bridge may also be known as the Lyons-Fulton Bridge, which was the name of a predecessor bridge and the name listed on the USGS topographical map. The town of Lyons, Iowa, was annexed to Clinton in 1895, but the north end of the city is still referred to as Lyons. The bridge is the terminus of both Iowa Highway 136 and Illinois Route 136. The 1975 bridge was named in memory Mark Morris, a long time member of the City of Clinton Bridge Commission who died in 1972. Morris was instrumental in the construction of the 1975 bridge and the City of Clinton Bridge Commission named it in his honor.
Document 11: Waterford, Mississippi: Waterford is an unincorporated community located in Marshall County, Mississippi, United States. It is a small town located between Holly Springs and Oxford on Highway 7. The city once had several small stores, shops and a cotton mill. Currently there is only one store. The city is also the home of Wall Doxey State Park and is also a part of the Mississippi National Forest.
Document 12: Waterford, Virginia: Waterford is an unincorporated village in the Catoctin Valley of Loudoun County, Virginia, located along Catoctin Creek. Waterford is northwest of Washington, D.C., and northwest of Leesburg. The entire village and surrounding countryside is a National Historic Landmark District, noted for its well-preserved 18th and 19th-century character.
Document 13: Sabula Rail Bridge: The Sabula Rail Bridge is a swing bridge that carries a single rail line across the Mississippi River between the island town of Sabula, Iowa and Savanna, Illinois. Originally built for the Milwaukee Road, and subsequently owned by the Iowa, Chicago and Eastern Railroad, the bridge is operational and is currently owned by Canadian Pacific Railway.
Document 14: Hardy, Mississippi: Hardy is an unincorporated community located in Grenada County, Mississippi and part of the Grenada Micropolitan Statistical Area . Hardy is approximately north of Grenada near Interstate 55.
Document 15: Bridge in East Fallowfield Township (Mortonville, Pennsylvania): The Mortonville Bridge and Mill Race Bridge are stone arch bridges carrying Strasburg Road across the West Branch Brandywine Creek and an abandoned millrace at Mortonville, Pennsylvania. The Mortonville Bridge was placed on the National Register of Historic Places on September 18, 1985, while the Mill Race Bridge was added as the Bridge in East Fallowfield Township on June 22, 1988. The Mortonville Bridge was removed from the Register on July 16, 2010, following reconstruction; the Mill Race Bridge remains registered.
ground_truth: Marshall County
sub_queries: Which state is Motley Slough Bridge located? Answer: Mississippi
Waterford, Mississippi >> located in the administrative territorial entity Answer: Marshall County