Dear Mr. Holland,
Thank you for posting your request on History Hub!
We are unaware of an all encompassing roster for the CCC. We searched the National Archives Catalog and located the "Happy Days" Newspapers, 5/20/1933 - 10/26/1940 in the Records of the Civilian Conservation Corps (Record Group 35) that includes 89 issues that include various rosters. The records have been digitized and are available using the Catalog.
Since you have already submitted a NA Form 14136, Request Pertaining to Civilian Conservation Corps (CCC) Personnel Records to the National Archives at St. Louis (RL-SL) for Joseph C. McConnell, Jr., we apologize for the inconvenience and appreciate your patience. His file will be the best source for determining what CCC projects he was part of. Unfortunately, these records have not been digitized.
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 the National Archives at St. Louis (RL-SL). We apologize for this inconvenience and appreciate your understanding and patience. Please feel free to email email@example.com for a status update on your previous request.
We hope this is helpful. Best of luck in your research.