A water-skier and a woman in a boat alerted authorities yesterday afternoon after each seeing a human body bobbing in the water, about 20 minutes apart.

The boat returned to the scene but was unable to find anything.

Wodonga police and staff from Lake Hume Resort then went out in boats to scan the lake's surface but were unable to find anything.

Last night, a Victoria Police helicopter searched the water from above, also to no avail.

It conducted a further sweep about 9am today, while officers in cars and on foot moved to check vehicles parked around the lake.

Sen-Sgt George Bedson, of Wodonga police, said inquiries had also been made in relation to any recent missing persons reports.