( CNN ) -- A third person has died in the extensive flooding that has deluged entire towns and threatens even more communities in southern Alberta , Canada , authorities announced Saturday . The three victims , two females and a male , were all found in the Highwood River that runs through the town of High River , about 40 miles south of Calgary , the Royal Canadian Mounted Police said . Officials did not identify the victims . High River is one of the worst-affected areas in the flooding that began after torrential mountain rains . At one point , the entire town of 13,000 was covered in brown floodwater and all residents are under an evacuation order , Cpl . Laurel Kading of the RCMP told CNN . There was `` substantial '' and `` extensive '' damage in the town , where waters rose so rapidly Thursday that about 1,000 people had to be airlifted or rescued by boat , the RCMP said . Kading described one man who dropped his keys when the water began rising , and when he stood up , the water was at his waist . The local news site High River Online reported river levels down substantially on Saturday in some parts of the town , but high water remaining in others . Photographs from the site Saturday showed a large pickup truck entirely caked in mud , indicating how high the water had reached . Another showed a submerged railway bridge covered in tree trunks and tree limbs . More photos showed buildings and roads still submerged . The RCMP said it was conducting door-to-door checks of homes throughout High River . There also was severe flooding to the west of the town , in the foothills of the Rocky Mountains . `` All the little towns all the way along have been affected to some degree or another , '' Kading said . `` There are reports of some farms in rural areas where some people have been stranded as well . '' To the east , the city of Medicine Hat was preparing for the South Saskatchewan River to burst its banks . City Hall was lined with sandbags . The city predicted water to spill over the banks overnight Saturday and keep rising until it crests Monday morning . About 10,000 people in Medicine Hat , population 62,000 , were evacuated ahead of the flooding . City spokesman Brandy Calvert said officials expect the flood to eclipse the one they had in 1995 , which was the biggest on record . `` We do n't want to anticipate the worst , but we 're going to be prepared for the worst , '' Alberta Premier Alison Redford said before visiting the city Saturday . `` We know that from what we 've seen everywhere else that this is more exceptional than we 've ever seen in Alberta before , so we 're presuming that that 's probably the circumstance that we 're looking at ( in Medicine Hat ) as well . '' Calgary was still covered in water days after the Bow and Elbow rivers overflowed . The city was under a state of emergency Saturday , though Mayor Naheed Nenshi said the flow of the water was slowing and some people could start returning home Saturday night . The home of the NHL Calgary Flames , the Saddledome , also was flooded . The team posted pictures on its website showing the darkened interior of the dome with brown water sitting at row eight , blocking the entrance to the players ' tunnel . Downtown Calgary will be closed until the middle of next week at the earliest , said Nenshi 's spokesman , Daorcey Le Bray . About 30,000 power customers were without power , the city said . A pedestrian bridge over the Elbow River was damaged and city assessors were trying to determine the state of the dozens of other bridges , Calgary Police said .
The three victims are in the flooded town of High River . Medicine Hat is preparing for the flooding to start Saturday night . Much of Calgary is still submerged . The Saddledome , home to the Calgary Flames , is flooded .