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Records for Yellowtail dam can be found within RG 115 Records of the Bureau of Reclamation. You might also find records within RG 75 Records of the Bureau of Indian Affairs, Crow Agency. All of these records can be found at the National Archives in Denver, CO. I would suggest that you reach out to the office directly and work with one of the Archivist on staff there. You can direct an email to their general delivery inbox at Denver.Archives@nara.gov
Dear Mr. Doyle,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located 5 series pertaining to the Yellowtail Project: Land Acquisition & Right Way Files, 1902-1967 (includes 80 file units); Program Subject Files, 1931-64] Crow: Yellowtail Dam and Reservoir Project; Subject Files Relating to the Shoshone, Sun River, Yellowtail, and Fort Peck Projects, 1916-1961; Project Histories and Proposed Reclamation Projects, 1902-1978; and Project Histories. 1902-1995 in the Records of the Bureau of Reclamation (Record Group 115). For access to and/or copies of these records, please contact the National Archives at Denver via email at firstname.lastname@example.org.
Also, please review the Bureau of Reclamation Yellowtail Dam; National Park Service Yellowtail Dam & Bighorn Canyon; and Summary of Yellowtail_Dam for background information.
We hope this is helpful. Best of luck with your research!