The Subject Files series contain materials related to specific types of projects and are arranged by subject, such as grading, plats, parks, paving, sanitary sewer, water main, and the like.

The highlight here is a volume under the subject “Grading” that contains the certification by City Surveyor of work completed, plus a record of street grades, profiles, etc., dating from the city’s beginning in 1856-1860; 1867. This volume is a good record of what the city surveyor’s office was expected to do. Another gem is an “index to plats in vault” which includes profiles of streets, sewer plans, water works plans, bridge plans and river survey, architectural plans and maps & plats of surveys, paving & more. There is no date on this volume, but it is very early (circa 1860s) and probably spanned a good chunk of time.