These three writing rubrics are staples in my fourth grade ELA classroom. Now I've made them for 3rd grade! Use these for each of your final pieces turned in for your portfolio. Each rubric is aligned to the common core writing standards for opinion, explanatory and narrative writing. Each rubric also includes a section for scoring L.3.2 (which applies to grammar and convention use within writing pieces).
I hope these three rubrics will become your go-to when it comes to setting expectations and grading third grade writing!