The NARA records are not accessible online and will need to be requested by the specific NARA agency where records are stored. Using the link below you can see a list of all federally run schools that NARA has records for.
The schools listed below have records stored at NARA Denver.
Colorado: Fort Lewis Indian Boarding School and Ignacio Boarding School.
Montana: Fort Shaw Indian Boarding School.
Utah: Intermountain Indian School.
New Mexico: Albuquerque Indian School, Zuni Boarding School, Southwestern Indian Polytechnic Institute, Shiprock Boarding School, Santa Fe Indian School, San Juan Boarding School, and Nenahnezad Boarding School.
Source: Navigating Record Group 75: BIA Schools. National Archives. Last reviewed on June 25, 2018. https://www.archives.gov/research/native-americans/bia-guide/schools