Description: Using the most recent hydro data and navigable waterway attribute data, this polygon layer is calculated by a buffer of 1,000 feet of the ordinary high water mark of navigable lakes, ponds, or flowages and 300 feet of the ordinary high water mark of navigable waterways. This layer also incorporates FEMA flood zone areas. The source hydro layers and FEMA flood zones were updated in 2024. This layer was also updated by creating buffers of the hydro waterlines, dissolving those buffers, and using clips and appends to integrate FEMA flood zones and clip out water polygons.