It was in the early 1940's that the dam was put in at the foot of Logie and a lake was formed from the stream from the foot hills. It was known as Rainbow Lake, and Mr. & Mrs. Louie Anderson ran it for several years. It was very popular. You could fish and they would fry it for you. They were there until they widened Highway 30 (or St. Helens Road) and they cut unto what was the restaurant. It has been missed by many friends including myself.
For years in the summer and fall we would have a double rainbow and it always seemed to end at the Lake.
The lake is real deep with many huge logs and stumps in the bottom. To my knowledge it was never cleared just filled with water from the hills. The newspaper used to call the hills "Little Upstart" or Tuality Mountains, of late they have been called the West Hills, which takes in the entire ridge towards Portland.
Includes ... Tualatin Mountains ... Portland West Hills ... Council Crest ... Cornelius Pass ... Logie Trail ... Tualatin Basin ... Tualatin Plains ... Tualatin River ... Tualatin Valley ...
http://columbiariverimages.com/Regions/Places/tualatin_mountains.html