Using the NFHP National Assessment Results Viewer


This map viewer allows for the visualization of the primary results reported in "Through a Fish's Eye: The Status of Fish Habitats in the United States 2010" at various spatial scales. Users are encouraged to review the Methodology for Rivers Assessment and the Methodology for Estuary Assessment used to generate these results to assist understanding the information presented in this viewer.

Compressed files of national assessment results, additional data resources not included in the National Data Viewer, and links to the ArcGIS map services used for this viewer are available in the Data Download & Map Services page of this site.

On the left hand side of your screen are controls for changing the map display. Within the Map Controls section are 3 areas:

The first area allows you to select a scale at which to display the "Risk of Current Habitat Degradation" maps (layers). There are four scales at which the map may be displayed - Ecological Drainage Unit , 4th level Hydrologic Unit Code (HUC8), 6th level Hydrologic Unit Code (HUC12; default), and National Hydrography Dataset Plus (NHD+) Catchments. When the page is first viewed, the risk of current fish habitat degradation at the HUC 12 scale will be displayed. You may change the scale by selecting a new scale from the drop down box and the map will automatically refresh. You may experience a delay in the image display, as this can be affected by current number of users of the application and the speed of your computer/internet connection. Once the map is loaded, you may click once on any of the colored areas and a "popup window" will display the assessment summary and links to the methodology used to generate it.

The second area allows you to overlay one or more boundaries of Fish Habitat Partnerships on top of the map. Select a partnership boundary by clicking the check box next to the name of the partnership. The boundary will automatically display on the map. Click on "Select all" or "Select none" at the bottom of the list to display all or none of the boundaries. Additionally, you can display a map which shows areas where multiple partnerships are represented by clicking the checkbox for "Show partnership overlap areas".

The third area allows you to add a location reference layer to the map. Additional layers include State/County Boundaries, NHD streams and watersheds, and US Congressional Districts, all provided by the USGS National Map Program. You may also display a map which depicts USFWS Landscape Conservation Cooperatives. To display any of these additional layers, check the box "Other Layers" and select the layer from the list.

To the right of the map are icons which are used to change the background map. Select a background map from the list of icons by clicking on it, and the background of the map display will change.