The flume is owned by PG&E, which uses the water to generate power downstream in two hydroelectric powerhouses, but I believe it incorporates parts of one of the flumes originally built in the late 19th-early 20th century for the lumbering companies, which used flumes both to supply power to mills and to transport timber. Today, the flumes offer hiking trails and some people enjoy floating down them on inner tubes.
Even earlier, gold miners used to build huge flumes to divert entire rivers, exposing the riverbeds so the miners could more easily extract the accumulated gold deposits under the river rocks. Some of these huge flumes also supplied water to the hydraulic mining gear which was used to wash away entire mountainsides to expose deeply buried gold deposits. I think those flumes are all gone, though.
Anyway, if the fire crosses the river (and the scenes of the river in the video show how narrow it is) and moves south, the canyon-side woodlands along the flume will be among the areas in its path. The flume crosses side canyons on wooden bridges in some places, and those are apt to burn, too. The metal bridges will probably just bend and collapse. The scenery will be very different around here if the fire comes west of the river.
Erosion of the exposed mountainsides during future rainstorms will probably unearth more gold and send it into the river, though, so the handful of placer miners (mostly weekend hobbyists) still working the area will benefit, at least.