Green Valley is a muni on the south side of Sioux City, off I-29 at Singing Hills, east to Lewis, then south to Donner to the golf course. It's a parkland style of layout with trees scattering the fairways, where off-line tee shots are mostly recoverable. It was designed by David Gill in the 1960's, and from the tips can play to 7,000+ yards, the Whites are 6,200 yards with a 117 slope. Fun course, lots of interesting holes, especially the par 3's. The par 5's are drivable in two so you can have a good day here. Not all that penal, but there's a lot of water for wayward shots. Good conditioning rates fair, basic clubhouse and facilities.