Do you have any additional information on you individual, name, DOB, and place of birth?
Dear Ms. Peterson,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located the series Carded Records Showing Military Service of Soldiers Who Fought in Volunteer Organizations During the American Civil War in the Records of the Adjutant General's Office, 1762 - 1917 (Record Group 94). Most of the service records in this series have been made available via microfilm and through digitization of the microfilm. Unfortunately, the records for Colorado Volunteers have not been microfilmed or digitized.
To order copies of non-digitized service records, please fill out a NATF Form 86 for the service records and mail the completed form to the address listed on the form. For more information see Requesting Copies of Older (pre-WWI) Military Service Records. There is a reproduction fee for this service.
Please note that the National Archives and Records Administration (NARA) has suspended reproduction and digitization services until further notice due to COVID-19. Orders will not be serviced until operations can resume safely. NARA has also temporarily suspended the option for placing online orders using eservices.archives.gov. Once operations resume, document reproduction requests will be filled in the order in which they were received. We apologize for any inconvenience.
Because this was a Colorado unit, the Colorado State Archives may also have records relating to this matter.
We hope this is helpful. Best of luck with your research!