Official websites use .gov A .gov website belongs to an official government organization in the United States. Secure .gov websites use HTTPS A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites. National Park Service Search Exiting nps.gov Rate the Lesson Plan Wandering the Watershed Menu 5: Hybrid B: Design Challenge & Design Visit Grade Level: Upper Elementary: Third Grade through Fifth Grade Subject: Science Brief Outline of the Menu: Additional details provided after application period. Each box below is a