First, you'll locate your part of Oregon on a map in ArcGIS. Then, you'll choose a basemap to provide a neutral background for your map.

At the top of your organization home page, click Map.

A new map opens. The map extent for a new map is set to the default extent of your organization (the contiguous US).

Note:

If you're in a new session, clicking Map opens a new map. Otherwise, it opens an existing map (the last map you were using). If an existing map opens, click New Map in the upper right corner of the page, and choose Create New Map.
In the search box to the upper right of the map, type the name of your town/city in Oregon. In the list of suggested locations, click Your Town, Oregon, United States.

The map zooms to the town you selected and shows some of the geographic features of the city.

Every new map starts with a basemap, which provides geographic context for the data that you want to display on the map. The colors, labels, and features of the Topographic basemap may hide some of your data, so you'll choose a more neutral basemap.
On the ribbon above the map, click the Basemap button and click Light Gray Canvas.

The map updates with the new basemap