Authorities have warned that water levels in the Ural River are dangerous and have launched an investigation into the dam collapse.
Russia said it had evacuated more than 4,000 people in the Orenburg region near the Kazakh border due to flooding after a dam burst.
The Orenburg governor's office said on Saturday that “4,208 people, including 1,019 children” had been evacuated and more than 2,500 homes had been damaged due to flooding caused by Friday's heavy rains that caused a dam to burst.
Governor Dennis Passler said flooding had reached its “peak”, adding that the situation was particularly dire in Orsk, a border city of 230,000 people.
Authorities said on Saturday that around 2,000 people had been evacuated from their homes in Orsk alone. Orsk is located in the Orenburg region of the Ural Mountains.
But authorities said the situation was difficult across the region and warned that water levels in the Ural River in the main city of Orenburg were dangerous.
Video footage released by the Ministry of Emergency Services showed residents wearing life jackets and boarding lifeboats. Thousands of homes were submerged in water, Russian news agencies reported.
Russia has also filed a criminal case for “negligence and violation of construction safety regulations” over the collapse of a dam built in 2014.
Local prosecutors said the dam collapsed due to mismanagement, Russian news agency reported.
Several regions of the Ural Mountains and western Siberia were affected by early spring flooding, as were parts of Kazakhstan.
Kazakh President Kassym-Jomart Tokayev said the floods could be Kazakhstan's biggest natural disaster in 80 years in terms of scale and impact.
“We have to learn all the lessons from these major floods,” he said.