Dams on Big River located at Mendocino

Dams were used by the Mendocino mill on Big River to bring the cut logs to the mill. The Mendocino Lumber Company was “famous” for damming Big River. With rare exceptions, dams along Big River were used only during the winter season. Logs were stored in the stream beds – see pic below:

Logs stored in a Big River stream bed

Winter rains furnished the freshet (body of water) for floating the logs down river, but in most cases, did not. Dams were then used to build up a reservoir of water. When the dams were tripped (blown up), a flood was created along with a “head.” A head is similar to the shore side of an ocean wave. Near the dam, a head might begin as high as 10 feet dropping to three-foot height 15 miles down river. A higher head, which would result in being able to float more logs a greater distance, would be obtained by tripping/blowing up more than one dam in succession. This, for sure, was in the days before environmentalists were invented. In his book, Big River Was Dammed, W. Francis Jackson documents at least 27 dams on Big River.

These pics (I believe) are all of dams on Big River:

Building a Big River Dam – note mule on the right with water carrying bags

Sluice gate on a Big River Dam

A Big River Dam with the Sluice Gate Open