Couple plus-side updates to the already great reviews, just for the sake of affirming:

The tee signage is improved. The holes are all marked with staked laminate signs that show the par, distance, and line for each shot.

Small signs point the way to next holes along the way.

It's quite navigable at this point, and mostly manicured quite nicely. And it's pretty awesome out there as a DGC and just in general, as rural Marion County goes.

Far as I'm concerned, the only thing missing from Wheatland is elevation. But even without, the holes are varied, challenging, and fun.
I did just lose a disc to the brambles tho. Swallowed whole. Gone.

Wheatland Disc Golf Course in Williamette Mission State Park located in Gervais, OR is located just a few minutes off I-5. There is a $5 daily users fee to enter the park. There's plenty of parking and a kiosk at the beginning. The kiosk had a small course map and a sign saying "Take one" but there were none available. The course is pretty easy to navigate with many little next tee signs everywhere. There are a few little laminated tee signs still standing although most have been destroyed. The tee pads are nice large concrete ones though some reviewers seemed concerned that they are a few inches above the ground level. I found them spacious enough to not present a problem. The baskets are the dark blue Bentley models. Other reviewers have complained about them. Personally, I think they're handsome but I did notice some rusting chains already.

I was impressed with the variety of holes both in length and open versus technical throws. There are holes with blind baskets, sharp doglegs, ACE runs, long open holes, holes forcing you to make decisions as to which route to take. A nice variety in all.

I had a couple of favorite holes. # 12 is a 200' throw under a natural canopy of trees of some type. You need to keep you tee off straight as well as low to birdie (or ACE?) this hole.

And then # 15 was interesting. The basket is probably 550-600' out around the fairway. But looming right in the middle of the fairway are two very large trees. I'd love to watch how better players attack this hole. They probably have enough arm to just hyzer around the big trees. Not me! Then the basket is tucked in between two fairly large clumps of bushes.

The course then ends back at the kiosk area starting with two longer holes including # 18's challenging run through the orchard rows.

Tee signs will be a nice addition.
Course is flat.
There are places when other park users will and do come into play. Just be courteous and be aware of your surroundings and you shouldn't encounter any problems.
Poison oak. I guess. I'm from Washington state. I don't think we have any up there and I didn't see any here.

Just another excellent choice for Oregon disc golfers. As if you didn't already have 4 star plus courses to choose from. I'm forever singing the praises of Oregon's ever-growing stable of great courses to golfers around the country. I think this course will compare nicely to Adair when tee signs are installed and the course is a little broke in. Pretty nice company, I'd say!

-Variety - tight wooded to wide open holes, good use of the space given
-Giant tee pads
-Trash Cans every few holes
- Few throwing conflicts with civilians for such a large course
-Long course, which is great for what the Salem area was lacking

-Poison Oak. God bless the crews who carved out these wooded holes, but the poison oak is everywhere none the less. It will diminish with use, but watch out if you're allergic.
-Baskets are short. My guess is by about 6 inches, which makes them weird to putt on.
-I don't know if some morons took them out, but there is no signage on many tees. In fact, there's no info about the disc golf course at all when you get to the park itself. There is a big new kiosk by the first tee pad, but there is no info on it.
-The tee pads are huge, but if you get close to an edge, you will fall off.
-This is being picky, but the course is pretty much flat

Wheatland is the largest course in the Salem area (by a lot). The variety in vegetation, both thick and dense, from rows of Filbert trees, to dense blackberry thickets, to open fields with the occasional giant tree, make the course. Whoever designed the course did an excellent job with both land use and ordering the of the holes. My wife, who is only an occasional player, told me it was her favorite course. It was pretty, with almost every whole opening a new challenge. I will play many times.