I have not either but we both know that they were. The first nations people (Natives) did use the streams and rivers for trading and travel that is for sure. Much easier to paddle a dugout than to travel through the bush from place to place plus all people's lived by water sources. This is a fact I know villages are on big rivers where they intersect with smaller rivers. Then in the smaller rivers villages are again at a intersection of a big creek, then another village on the big creek by a small creek. So on and so forth. These people had to have water. Water is where it is and that is where they will be. Water is life. Water was the interstate,then highways, then secondary roads, then dirt roads and trails to us. IMO for what it's worth water is a travel system and a trade route. Modern man changed that.