UNDATED-- Forecasters say another 3 inches of rain may have fallen in flooded areas of Montana but it's expected to taper off today.
More rain fell Sunday on already soaked communities, adding to more than a week of floods that brought as much as 8 inches to central and eastern parts the state.
On Sunday, Montana's governor ordered more National Guard troops to the town of Roundup to join the anti-flood effort and to provide unarmed security checkpoints.
More than four dozen guardsmen already have been helping on the Crow Reservation, which has been inundated by heavy flooding. And the only road leading into the town has been opened.
States downstream along the bloated Missouri River are getting prepared for floods, strengthening levees and placing sandbags ahead of the release of waters from dams and reservoirs.