Gangestad - arrival in NY?

According to the online emigrationrecords on "Digitalarkivet", Ole Nicoalysen (Gangestad) with his family, emigrated on May 17th 1872 with the ship "Hero" http://www.digitalarkivet.no/cgi-win/webcens.exe?slag=visbase&sidenr=10&filnamn=emikra1&gardpostnr=3336&merk=3336#ovre Their destination was "Fort Dogde" which I assume is in Iowa. In 1880 the family is found in Humbolt county in Iowa. But I am wondering about two things: 1. Where exactly is/was "Fort Dogde"? 2. When did the family arrive in NY? I have found that the corrosponding ships with Hero ( according to the depaturedate is: /forum/also-jumped-ship-ended-up-ny/ and last but not least. Where did they "go" after 1880? I think I might have found Ole and Inger ( the parents) in Howard county, but I have not access to the censusmaterial, so I cannot be sure. The ones who traveled were: ( The family name was Gangestad) Ole Nicolaysen ( Gangestad) b. 1831, Skjeberg Inger Marie Johansdatter b. 1828, Skjeberg Christian Nicolaysen ( Gangestad) b.1824, Skjeberg ( brother of Ole) children: Nicolai Edvard Olsen Gangestad b. 1853, Skjeberg Johan Severin Olsen Gangestad b. 1855, Skjeberg Otto Marentius Olsen Gangestad b. abt. 1858, Skjeberg Herman August Olsen Gangestad b. abt. 1861, Skjeberg Carl Ludvig Olsen Gangestad b. abt. 1863, Skjeberg Emil Marcus Olsen Gangestad b. abt. 1866, Skjeberg Hans Edvin Olsen Gangestad b. 1872, Skjeberg Berta