The Flat River flows through the counties of Montcalm, Ionia and Kent. The mainstream originates in the Six Lakes area and flows approximately 70 miles until it joins the Grand River at Lowell.

Flat River Plan Full Text (499 KB)

Below are individual sections of the plan:
-Cover Sheet, Preface and Table of Contents
-Map
-The Watershed and the Study Area
-Existing Uses and Recreational Opportunities
-Preliminary Natural Rivers Plan
-Appendix A - Part 305, Natural Rivers PA 451 of 1994
-Appendix B - "Alteration of Rivers" Law
-Appendix C - Related Laws
-Appendix D - Historical / Archaeological Sites
-Appendix E - Commission Resolutions
-Appendix F - Suggested Management Controls
-Appendix G - Suggested Guidelines for Management of Flat River System