Debra Schmitt, 53, of Ross was last seen last week at her high school. Investigators say they will search an area of the park where she has previously said she might stay.
Wednesday, police searched Phoenix Lake and Ross Creek where she liked to hike, but didn't find anything.
Last Thursday, students arrived in their classroom to find the words "thank you everyone" written on the black board of her classroom. She also left her ID, purse, vehicle and credit cards at her home in Ross.