On into South Dakota

On Monday we went north again. A very short travel day of about 70 miles. We stopped for 1 night in Sioux Falls. We wanted to see the falls the town is named for. We spent a very expensive night at the KOA, but it seemed the best choice based on it's location and having it a very good Internet signal.
The Falls Park is right in the middle of town on the Big Sioux River. Once upon a time a mill operated beside the river. A lack of wheat and increased production cost eventually shut it down. The building later burned. The brick ruins are still on site. We spent a couple of hours walking around and going to the top of the observation tower. While there we became concerned about a mama duck and her 3 ducklings. They were on a very small island in the middle of the river right next to the falls. They seemed to be eating something on the edge of the rocks. We watched for a while and at one point thought 1 duckling had gone over the falls. Happily we were mistaken when it came back up on top of the rock. We talked to someone in the gift shop that told us that many ducks and geese came to the river. So we left reassured the ducks were probably going to be OK.