It was filmed on a river in British Columbia, Canada, not a lake.
Boulder, Colorado and Vancouver, BC, Canada area
The movie was actually filmed at 3 separate lakes, Buntzen Lake, Hayward Lake and Shawnigan Lake in British Columbia, Canada.
The big river scene was in Canada.
Bass Lake Calif
Several scenes were filmed at Upper Lake Mary and Mormon Lake in the Coconino National Forest,
Lake Tahoe
Lake Crescent near Port Angeles. Washington
No, the music video was filmed at Old Hickory Lake in Nashville, Tennessee.
The commercial was filmed at an area surronunding Elk Lake in northern Michigan that is very flat.
Maine
Lake Alouette in BC, Canada
Lake Alouette in BC, Canada