Dear Ms. Kisluk,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located the series titled the Project Reports on Civilian Conservation Corps Projects in State and Local Parks, 1933 - 1937 in the Records of the National Park Service (Record Group 79) that include a file unit [Alabama] DeSoto State Park, SP-5. The file may contain the blueprints you seek. For access to this file unit, please contact the National Archives at College Park - Textual Reference (RDT2) via email at email@example.com.
Due to the COVID-19 pandemic and pursuant to guidance received from the Office of Management and Budget (OMB), NARA has adjusted its normal operations to balance the need of completing its mission-critical work while also adhering to the recommended social distancing for the safety of NARA staff. As a result of this re-prioritization of activities, you may experience a delay in receiving an initial acknowledgement as well as a substantive response to your reference request from RDT2. We apologize for this inconvenience and appreciate your understanding and patience.
We hope this is helpful. Best of luck with your research!
Thank you for the information! The park recently bought the drawings on Ebay, so they are being archived there.