The national government has dispatched the army to help with rescue efforts and promised 10 billion rupees ($170 million) in disaster relief funds to the Uttarakhand government.
Some observers are saying the disaster was man-made.
Devinder Sharma, an environmentalist, blamed industrial activity in India's Himalayan region.
"This havoc is a result of massive deforestation and mining," he said. "It's an ecocide."