These maps present the spatial distribution of various features of interest in the watershed.

Base Map
Shows roads, lakes, rivers and political boundaries in the Watershed.

Lake Michigan Bathymetry
Shows relative depths of Lake Michigan.

Sub-Watershed Boundaries
Shows the boundaries and names of the sub-watersheds within the Grand Traverse Bay watershed.

Pre-Settlement Vegetation
Shows an interpretation of the distribution of different vegetation types prior to european settlement.

Glacial Geology
Shows geological features in the watershed.

Public Lands
Shows publicly owned lands in the watershed.

Composite Wetlands
Shows areas considered wetlands in the watershed.

Erosion Potential
Shows the erosion potential of soils in the watershed.

Land Use (1978)
Shows 1978 land uses in the watershed.

Elevation (DEM)
Shows land elevation based on the Digital Elevation Model (DEM).

Bathymetry & Elevation (DEM)
Shows bathymetric data of Lake Michigan and land elevation.

Rectified Aerial Photos
Photos showing nearshore water environment along Grand Traverse Bay.

These maps present locations of various features throughout the watershed. You can usually click on the feature symbol on the map to get more information.

Birds Eye Photos
Click on the location symbols on this map to view an oblique aerial photo of that area taken in the Fall of 1999.

Water Quality Sampling Locations
Shows all sampling locations from our Water Quality Database.

Water Quality Monitoring Locations
Shows all locations monitored during one of our volunteer monitoring programs.

Shoreline Survey Locations
Shows either Feature Location or Beach Segment data collected during our Grand Traverse Bay Shoreline Inventory.