Who are your stakeholders? Faculty in the department, of course, are the most important consumers of assessment results, and will have been involved in discussions of those results already. Students have been providing you with data (and informed consent) all along, so they ought to have access to what you've learned, too. You may have had the help of department or program graduates; they, too, may be an important audience for whatever you write up. In any case, it is good practice to present your assessment results in a manner that will be accessible to the broadest possible audience, and to write it up as one would write up any other professional report of research.
Report to the administration
The administration, too, is a stakeholder in assessment of your program. Your major accountability is, of course, to your dean's office. The CAE is eager to keep track of all assessment work on campus, to plan support services and to help assessment planners to make connections across departments and colleges. Finally, both the provost and the president will want to know that assessment work is proceeding well. The easiest way to be sure that all of your campus colleagues can see your assessment work is to post descriptions of your work to the OIRP assessment database (a subsection of the OIRP Departmental Profile database). Your results, along with those of other academic units, will be reviewed by your dean and by the CAE assessment staff for use in planning. They will also be used to satisfy the requirements of various professional and accrediting bodies.
Present or Publish
The scholarship of assessment may or may not be highly valued in your discipline. In any case, if you have done assessment work that you think might be of wide interest, there are a number of peer reviewed journals that will provide an outlet for your work. The Center for Academic Excellence will be happy to help you find outlets for publication or presentation of your assessment work.