River rises rapidly after heavy rains, will drop slowly. Recent rains in the upper St. Croix River watershed have sent the highest water in more than two years down the river. On Saturday, May 14, the river reached 683 feet above sea level at Stillwater, triggering automatic no-wake status. As of publishing time on Monday, May 16, it was at 684.74 feet, and expected to rise another six inches or so.