Recent habitat improvements at Hendrickson Marsh will be on display this fall 8/19/2020 6:54:00 AM View Count 2886 Sitting smack in the middle between Marshalltown and Ames, the 850-acre Hendrickson Marsh Wildlife Area is a get-away-from-the-crowd kind of place, enjoyed by kayakers and bird watchers, and outside of opening weekend of duck season, by hunters.