s increasing releases from Missouri River dams because of higher rain forecasts. In South Dakota, the revised release plan means water levels in Yankton, Dakota Dunes and other communities downstream will be higher than previously expected, possibility by as much as 3 feet or more, the governor said. Inmates have been sent to Yankton and Dakota Dunes to fill sandbags, but Gov. Dennis Daugaard advised residents to be ready to evacuate. About 17,000 people live in the two communities. "We expect flooding in these communities to be significant," the Governor said. "I urge property owners in these areas to begin to plan immediately for an evacuation and to take steps to protect themselves and their property." Near Bismark, N.D., the U.S. Army Corps of Engineers planned to increase releases over the coming weeks at Garrison Dam, about 75 miles upstream on the Missouri River. Plans also called for releasing water at four other Missouri River reservoirs. The Missouri River in Bismark was slightly below flood stage of 16 feet on Saturday, but well out of its banks in some parts of the city and nearby Mandan, and officials are building levees to protect the city from a flood stage of 21 feet. North Dakota Gov. Jack Dalrymple also said Saturday that the Federal Emergency Management Agency had expanded its federal emergency declaration to include seven state counties and the Standing Rock Reservation as they fight rising water on the Missouri River. A state of disaster also was declared Friday on the Fort Berthold Reservation by Three Affiliated Tribes Chairman Tex Hall, who said flooding had damaged homes and other buildings, swamped farmland and caused highways to erode. FEMA issued an emergency declaration in early April for 14 counties hit with flooding. In Montana, Gov. Brian Schweitzer deployed Montana National Guard soldiers to the Crow Reservation, one of the hardest hit areas, a day after touring the area. The guardsmen were setting up unarmed security checkpoints on the Crow Reservation Saturday afternoon to help with emergency response. Crow Tribe officials earlier in the week requested National Guard aid after heavy rainfall put much of the reservation under water and left residents stranded. Crow Chairman Cedric Black Eagle said the tribal government helped pump water out of flooded basements and clear off roads so families could return and start to repair their homes. It was possible people would have to leave the reservation again if water levels began to rise again, he said. To the northwest, the small agricultural town of Roundup seemed to retain much of its flood water and the Musselshell R