Authorities in Sioux City keeping a close watch on rising water levels. Sioux City Fire Rescue says the most recent predications from the National Weather Service show a crest of 30.5 feet that’s a little bit higher than first thought. That’s even higher than the flow from back in March. The Iowa DOT did close a portion of Hamilton Boulevard at Interstate 29, and the southbound on-ramp and off-ramp to Interstate 29. The Sioux City Public Boat Ramp is closed and access to Chris Larson Park from