FILE PHOTO FLIP PUTTHOFF Scott Hodge, left, Siloam Springs parks and recreation manager, and David Vansandt with the city’s parks advisory board, have a look at the whitewater park being built on the Illinois River on the south edge of Siloam Springs. A new U.S. Geological Survey study says whether a stream in the river’s watershed is healthy depends on more than whether there’s a poultry farm.