Dear Ms. Mayfield,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located the Civil Works Map File, 1818 - 1947 in the Records of the Office of the Chief of Engineers (Record Group 77) which includes 17 maps related to Galveston and 83 maps related to Texas from the 1860s. These maps have been digitized and are available online through the National Archives Catalog. There may be additional maps in National Archives custody that have not yet been digitized. For more information about these records, please contact the National Archives at College Park - Cartographic (RDSC) 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 RDSC. We apologize for this inconvenience and appreciate your understanding and patience.
We also searched the Library of Congress catalog and located 6 maps related to Galveston and 45 maps related to Texas from the 1860s. There may be additional maps in Library of Congress custody that have not yet been digitized. For more information about these records, please contact the Geography and Map Division.
Finally, we suggest that you contact the Archives and Information Services Division of the Texas State Library and Archives Division, the Galveston Historical Foundation, the Galveston & Texas History Center, the Texas State Historical Association, and the Bullock Texas State History Museum for further assistance.
We hope this is helpful. Best of luck with your research!
I just wanted to let you know that through your assistance we were able to find a very important map for this project! It has cause all sorts of excitement here within the research committee. I wanted to say THANK YOU for being such a big help!