The original timber trestle at Rock Lake was completed in 1909. It was later replaced by a massive concrete bridge, which is what you will see today as you ride high above the enormous lake along the Milwaukee Trail. Local tribal legends speak of a giant, man-eating creature in the lake, so be careful.

Image courtesy of Whitman County Rural Heritage.
http://www.washingtonruralheritage.org/cdm/singleitem/collection/whitman/id/1023/rec/15