The records of the Clerk's Department comprise letter books (RC/C) of outgoing correspondence of the River Trent Catchment Board 1931-1951, the Trent River Board 1951-1965 and the Trent River Authority 1965-1975. There are a vast number of general files (RC/F/1-2) covering the years 1925-1974 which relate to all aspects of the work of the Trent River Authority and its two main predecessor bodies, ranging from major projects such as the Nottingham Flood Protection Scheme to personnel matters and quite minor administrative procedures. Accruals have added a series of files comprising the 'document archive' of the the Department (RC/F/3), and files relating to the Doncaster District Drainage Board 1929-1933, some of whose functions were taken on by the River Trent Catchment Board under the Doncaster Area Drainage Act, 1933 (RC/F/4).
Also included amongst the records of the Clerk's Department are the administrative and financial papers, some dating back to the early 19th century, of a number of internal drainage boards prior to 1965 (RC/I), including Bramcote Brook Independent Drainage Board, Crowle District I.D.B., Forebridge Drainage Board, Misson I.D.B., Idle, Ryton and Bycarsdyke Court of Sewers, Sow and Penk, and Whitewater I.D.B. The series of legal documents (RC/L) includes many copies of enclosure awards, the originals of which date from 1760, as well as papers concerning some minor cases.
Material such as minutes and committee papers (previously RC/M), grants of arms and annual reports have now been moved to form a new collection of governance records of the Trent River Authority alongside similar material from the other departments (RG).