Question: Which county shares a border with the county where Dow city is located?

full_context: Document 1: Dow City, Iowa: As of the census of 2010, there were 510 people, 219 households, and 137 families residing in the city. The population density was 1,593.8 inhabitants per square mile (615.4/km2). There were 242 housing units at an average density of 756.3 per square mile (292.0/km2). The racial makeup of the city was 93.1% White, 0.2% Native American, 6.1% from other races, and 0.6% from two or more races. Hispanic or Latino of any race were 9.0% of the population.
Document 2: Des Moines metropolitan area: The Des Moines metropolitan area, officially known as the Des Moines -- West Des Moines, IA Metropolitan Statistical Area (MSA), consists of five counties in central Iowa, United States: Polk, Dallas, Warren, Madison, and Guthrie. The 2010 census population of these counties was 569,633, and the 2017 estimated population was 645,911.
Document 3: Fort Dodge, Iowa: Fort Dodge is a city in and the county seat of Webster County, Iowa, United States, along the Des Moines River. The population was 25,206 in the 2010 census, an increase from 25,136 in the 2000 census. Fort Dodge is a major commercial center for North Central and Northwest Iowa. It is located on U.S. Routes 20 and 169.
Document 4: Gowrie, Iowa: Gowrie is a city in Webster County, Iowa, United States. The population was 1,037 at the 2010 census. The town has a swimming pool, golf course, athletic stadium, and curb-and-gutter throughout the community.
Document 5: Dow City, Iowa: Dow City is a city in Crawford County, Iowa, United States, along the Boyer River. The population was 510 at the 2010 census.
Document 6: Black Hawk Bridge: The Black Hawk Bridge spans the Mississippi River, joining the town of Lansing, in Allamakee County, Iowa, to rural Crawford County, Wisconsin. It is the northernmost Mississippi River bridge in Iowa.
Document 7: 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 8: Government Bridge: The Government Bridge, or Arsenal Bridge, spans the Mississippi River connecting Rock Island, Illinois and Davenport, Iowa. It is located near upper Mississippi mile 483, adjacent to Mississippi River Lock and Dam No. 15. The current structure, the fourth in a succession at this location, includes a swing section to accommodate traffic navigating the locks. The double tracks of rail above the road level is an unusual feature for a bridge.
Document 9: Black Hawk Township, Jefferson County, Iowa: Black Hawk Township is located in Jefferson County, Iowa. The population is 314 with 161 males and 153 females. The land area is with no water area.
Document 10: Hawarden, Iowa: Hawarden is a city in Sioux County, Iowa, United States. The population was 2,546 at the 2010 census. It is located on the Big Sioux River.
Document 11: Corydon, Iowa: Corydon is a city in Wayne County, Iowa, United States. The population was 1,585 in the 2010 census, a decline from 1,591 in the 2000 census. It is the county seat of Wayne County.
Document 12: Dowling, Michigan: Dowling is a census-designated place (CDP) in Baltimore Township in Barry County, Michigan, United States. The population was 374 at the 2010 census.
Document 13: La Crosse Rail Bridge: La Crosse Rail Bridge is a swing bridge that spans the Mississippi River between La Crescent, Minnesota and La Crosse, Wisconsin.
Document 14: 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 15: 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.
ground_truth: Allamakee County
sub_queries: In which county is Dow city located? Answer: Crawford County
Crawford County >> shares border with Answer: Allamakee County