So that narrow rocky road that shoots off to the left (then curves right not too far down, then starts on a downhill grade for a little while) was the road you want. It's only a couple minutes past the ATV staging area. There are/were no signs up there, except for CB channel signs for truckers. It can be a little hair raising of a trip on the first time - but once you've been there and seen it it's not bad at all. You've got a couple miles on that road and you'll see the parking area and trail head to the falls. There is/was a sign board there. And the parking area is/was ringed with huge rocks and it had a portapooper.
If you go another mile or so up that road you'll reach the camp ground. There's a brick poop house by the road, and unimproved camping spots in the campground proper. Just past this, around the bend is a concrete bridge over the stream, and a gravel pullout you can park at and have an easy walk to the creek. Fishing downstream from here all the way to the edge of the falls is fairly easy, only one dicey wading spot where the stream gets wide and deep - I'm 6'4" and it comes to my navel at that crossing. Good fishing in that run though
Upstream from the bridge is more of an invigorating hike, the stream gains elevation a bit quicker than it looses it down from the bridge. Upstream of the bridge also gets fished less, or did. Fisherman's trail petered out after about 200 feet. Some nice runs though if you go upstream of the bridge. Great dry fly water.
The run immediately upstream of the bridge wasn't the greatest - the channel runs river left (to your right if facing upstream) and there are a bunch of overhanging limbs. It doesn't get really deep and there wasn't a lot of contour to the bottom. The fish always seemed to spook easily in that run to boot. Upstream where it bends to your left a bit there are better runs. The banks are very brush lined to watch your back casts. There were some downed tree limbs to watch out for if you are fishing nymphs or wet flies - but those could've been washed downstream by now. Don't want to spoil all of it for you, but I'll say there's some fun, pretty water up stream if you're up for the walk.
If you venture up the road past the bridge, count your turns and turn offs carefully! It's easy to get turned around with all the spurs up there. While exploring the drainage and looking for a certain lake - I found Mollala on accident by taking too many left turns
My second attempt to find said lake was a success. But I did a bit of extra unintended exploring up there too...
Word of caution - TAKE A SPARE TIRE - sorry for shouting, but I've blown tires up there. Once I was 15 miles up the road from Camp Dakota. THAT was not pleasant. I ground an alloy rim down to...well lets just say it wasn't really recognizable. Just to get to Crooked Finger. From there we walked half way to Camp Dakota before a nice retired couple on a country drive gave us a lift down there. Then we hoofed it all the way back to the car and waited for the tow truck. Did I mention I foolishly made that trip ON my spare tire? Yeah. Embarassing, given what I do for a living. Took 3 hours for the boss to get to us. I'm not sure AAA or other auto clubs would actually send a tow truck up there - AAA sometimes declines service if you're on logging roads or wilderness areas. Even if they sent a truck - the closest tow services are Baker & Baker in Woodburn, P&M out of Salem, or Whitman's out in Canby, IIRC.
Probably don't need to tell you the next bit - but if you're going up there this time of year, make sure you've got gear stowed in the car in case you have to spend a night or two up there. I hit the April opener up there a few years ago, and a light misty rain turned into a good snow fall by noon. Even in a 4WD with chains - I wasn't going to risk staying up there by myself. To rub salt in the wound - I didn't even get a bump that morning during what fishing I was able to do.
I used to make that trip up there in a typical 4 door sedan - so your Focus will be fine if you stick to the road. Watch for crazies going way too fast up there though. When the creek was open April to October, you could almost count on seeing a state trooper making the rounds, which was nice. ODF foresters were a common sight too.
When fishing Abiqua I've seen all manner of sedans and hatchbacks up there - and if I remember right Modest Man used to drive a focus himself and fished up that way.