Dear Mr. McCracken,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located Confederate Maps, 1861 - 1876 of the War Department Collection of Confederate Records, 1825 - 1927 (Record Group 109) that includes these maps. We also located the Record Books of Executive, Legislative, and Judicial Offices of the Confederate Government, 1874 - 1899 in Record Group 109 that include the A&IGO - Special Orders, 1862 - 1863, which may contain orders for the destruction of the bridges. The maps and orders are digitized and are available via the Catalog.
In addition, we located the Confederate Papers Relating to Citizens or Business Firms, 1874 - 1899 in Record Group 109 that include some of the documents related to railroads and firms doing business with the Confederate government. For more information about these papers, please contact the National Archives at Washington, DC - Textual Reference (RDT1) 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 RDT1. We apologize for this inconvenience and appreciate your understanding and patience.
Lastly, we suggest that you review these pictures of Ruins of bridge on Richmond & York River Railroad at the Library of Congress, as well as these maps at the Virginia Museum of History and Culture as well as the King Williams County Historical Society.
We hope this is helpful. Best of luck with your research!