Why there is a helicopter sitting north of madras, OR, , above the warm springs reservation every single night?
If you are looking up at a bright thing in the southwestern or western sky before 11 PM in March 2020 and you aren't also able to locate the planet Venus at the same time, then the bright thing is the planet Venus.

Venus is very high and bright in southwestern or western sky in the evenings these days.  Unless it is very near the horizon, it appears to shine with a white steady light.  With a clear distant horizon, it will set in the west about 23:30 PDT at your location.  (Calculated via this on-line tool.)

The star Sirius is also still prominent in the evening sky.  It can appear to flicker quite dramatically, flashing from red to blue, especially when near the horizon, but is nowhere near as bright as Venus.  With a clear distant horizon it will set in the southwest at about 2:50 AM PDT at your location.  (Calculated via this on-line tool.)

Does the object make a helicopter sound, or some other sound, or no sound?

Is the light steady, or is it definitely blinking completely off and then back on?  What color(s)?   What direction is the light from you?  Does it stay in the same direction from you if you drive 10 miles down a road and look at again? (I.e. does it appear to "follow" you as some observers have often said about such things?)  Is it so high that it could not be a tower?  Does it get nearer to the western horizon over the course of several hours? Can you establish what time it "sets" below the horizon, if it does? Is it still visible at midnight? Is it still visible in the pre-dawn twilight? If you have access to binoculars, does it look like a tiny round circle that is not flashing or flickering when seen through the binoculars?  

Odds seem good that it is Venus, but the answers to these questions should confirm or reject this hypothesis.  Due to the path of the ecliptic, Venus may be well north of due west even near the spring equinox when the sun is setting nearly due west.

If it is definitely a flying vehicle, which seems unlikely, you can't assume it is not an unmanned drone/ UAV.