A Confluence is where integer latitude and longitude lines cross. They are more interesting than the north pole and many many time closer. site 
I launched several one day expeditions in 2000 to document the first intentional visits to these places.
Portland Confluences visited in 2000. 46.0, -122.0 Wind River Confluence 45.0, -122.0 Bagby Confluence 45.0, -123.0 Salem Confluence BOUNDARY 46.2, -122.0
Try Topo Map
The official confluence site has an interactive compass where one can click from confluence to confluence. Each page lists multiple site reports. Look for mine listed as #1. Here, starting at Wind River to the north: page
See 2001 Geocaches that I've placed.