Before February 2 of each year, the department shall prepare a statement showing what construction work has been requested and proposed and may be undertaken by the department. The statement must set forth a general itemization of the estimated cost for each project and the total estimates of all projects. The department shall adopt a construction program which must include the projects to be undertaken by it during the following construction season and must establish project priorities. The department may increase, decrease, amend, or revise the construction program from time to time as circumstances warrant.