Shaun Alexander has the most all-purpose yards for the Seahawks in a game, with 273 yards against the Oakland Raiders on November 11, 2001.

what are the most yards in a game by a seahawk
Interpreted as:
What are the most yards in a regular-season game by a seahawk?
11/11/2001Alexander10/20/2002Morris10/18/1987Largent11/22/2015Rawls12/12/2010Washington9/26/2010Washington12/18/1988Williams11/12/1995Galloway11/20/2017Lockett9/29/2002Alexander11/4/2007Burleson12/20/1986Warner12/31/2017Lockett10/25/1998Galloway1/1/2012Washington12/20/1998Watters10/15/2000Rogers10/30/2011Washington9/22/2019Lockett10/25/2020Lockett10/31/2004Alexander11/27/1983Warner1/2/2000Rogers273264261255253253239237234231229221220220216216215214213209208207206