The deceased have been identified as Aswanth (21), Parakkal Rajeesh (22), Shine Sasi (18) and Akshay Raj (18).
The search operations, stopped due to heavy rains, will resume tomorrow, they said.
Nnine youths, ventured into the river for bathing last evening when the water level was low. But the water rose suddenly and they were washed away in the flash floods triggered by a land slide in the forest area following heavy rains in Wayanad district, police added.
A team of NDRF personnel from Thrissur have joined the rescue operations today with the police and Fire and Rescue Service personnel.
State Ministers, T P Ramakrishnan and A K Saseendran visited the area to monitor the rescue works.