Widowmaker is a Class V+ rapid located at mile 21 on the Middle Owyhee River that is typically portaged or lined by most boating groups due to its extreme difficulty and hazards including sieves and undercut walls.

The rapid features a tight line requiring entry from the right side to avoid a nasty hole, with left-to-right momentum being critical for successful navigation; higher flows (around 4,200 cfs) make the rapid more manageable than lower water levels.

Most paddlers and rafters choose to portage on the right side rather than attempt to run this crux rapid of the Middle Owyhee section.