TULSA, Okla. — The Arkansas River is undergoing some changes in Tulsa. Some days of the year, it looks less like a river and more like sandbars with some water going past. There are several reasons for this, including when and how much water gets released from Keystone Dam. Lower water levels create few opportunities for recreation on the river, but the dam is vital for safety. “Flood control, we want Keystone,” Paul Zachary, Tulsa City Engineer said. “Now, what can we do for the other items to make this be like something that we have water in the river.” By creating a new Zink Dam, water will once again…