This is a random thought/observation because of the photograph depicted. Prior to Anglo settlement streams and small rivers flowed freely. That changed when the settlers started to divert  waters by means of ditches. The result, soil erosion created deep cuts in the streams’ banks. Upper Willow Creek, east of Eagle Lake still flows naturally, as it always has, as there are no diversions there. In the mid-1920s that portion of Willow Creek was not only subject to spring flooding, but addition water from Eagle Lake via Bly Tunnel.

Tim