Waters levels in the Great Lakes are the highest they’ve been in nearly two decades.

According to the U.S. Army Corps of Engineers, water levels in Lake Huron went up five centimetres in June. It may not sound like much, but that's on top of 20 centimetres the lake has gone up since May of last year.

The lake reached record lows in late 2012, but precipitation amounts in the Lake Huron basin have been 18 per cent higher than the long term average this year, which has helped boost inflows of water. Levels are now higher than they have been in 17 years.

Tour boat operator Kevin Johnston says ice cover over the past two winters has also helped reduce evaporation.

“So we are losing water if it isn't frozen in the winter and in the spring and summer that will lead to lower water levels,” he says. “So having those snappy cold days in February has helped at least from what we can see here.”

Water levels are expected to remain stable through the month of August. Typically water levels start to go down in the autumn.