Are you applying for a grant through the washington county recreation and tourism, or this grant Washington County Grants
I am working with Steve Kruger on the course at SSSP and he asked us( stumptown disc golf) to write up a support proposal for the course.
To answer your question, yes multiple courses are used and sometimes they include pay to pay places like yourself along side a state park.
The Eugene disc golf club used a pay to play course on a ball golf course called Oakway and Dexter State Park for a tournament they run every year called the Eugene Celebration. Unfortunately the ball golf course removed the disc golf portion but once upon a time.