The SOTA peak database has the name of this peak incorrect as "Cardwell Hills HP", it is actually a well known peak called "McCulloch Peak" in the McDonald State Forest and all signs leading there, plus the marker on top, uses that name.
We didn't see any swamps, and it certainly wasn't swamped with people!
Getting to the trailhead was straighforward by following the directions at https://www.fs.usda.gov/recarea/willamette/recarea/?recid=80972.
This summit is only about a mile from a large parking lot on the road to the top of Marys Peak but it requires some strenuous up-hill bushwhacking from that readily accessible parking lot. There are some old logging roads in the area, mostly grown over with bushes, that will get you close to the summit but getting to a logging road from that particular parking lot was quite a workout. Looking at the satellite view there appears to be an easier, albeit much longer access route via a logging roads (for hiking) a bit farther to the north from where I started.