Birding on the Edge: Western Lyon County by Doug Harr (2004)

Kroger Tract (7), at 454 acres the largest component of the Big Sioux Wildlife Area and the largest parcel of public timber on Iowa’s side of the Big Sioux. Parking is available near the boat ramp access, just west along Hwy 18. One also can travel one-half mile east, turn south on Able Blvd., and follow a winding road uphill to a couple of parking areas located at the edge of hilltop fields and oak woodland. The first signed parking lot encountered is a good place to access much of the area. An old access road, now closed to vehicles, serves as a good walking trail. It descends through oak woodlands, ending up in abandoned weedy field on the river’s floodplain terrace.