I use this sheet as my progress monitoring data sheet. It is fully customizable in a Word format to fit your students' writing goals. It can be adapted for any grade level writing IEP goal.
I've had great success and positive feedback from parents when showing this data sheet with scores on it along with student work as artifacts. It easily displays student growth over 5 monitoring periods.
My district uses the Step Up to Writing Curriculum so the rubric is mentioned - it can be found easily online via Google and is a great resource for baseline data in writing skills.