These may be the same reports. I have a two-disc set of the Official Records, and the second disc is in at the moment. It covers the Volumes 32 to 53, all parts, of Series 1. There are 4 series. Series 2 covers prisoners of war in 8 volumes, including sections. I looked there for memory sake and it wasn't found. It was soon after Floyd had vacated his office in Washington, and when shipments of armaments due south were being challenged by northerners. If you need help in locating it, I can change discs and locate it. Just let me know. As far as I can remember it is possibly the new Secretary of War requesting the information from the Chief Engineer. In my quick search of Series 2, Volume one, I came across the Fort Warren, Boston Harbor location as a prisoner depot, where negotiations were made to ship the prisoners south to Norfolk for exchange, page 77.I didn't realize that - Thanks! I have spent a lot of time in the Annual Report of the Chief of Engineers each year. That gives similar, but different, information. I also have spent a lot of time at NARA College Park where they have drawings submitted by the engineer on site showing the level of completion. The annual reports also include armament charts which give the numbers of each type of weapon at each fort, and which ones are mounted and which ones are not. Very interesting.
I will look at the Official Records for the grading that you mentioned. That sounds like it will be very interesting!