There are some good access points from the bank, especially this time of year when the river is down... Elkton has good bank access, and there is a park nearby (off HWY 138), I believe its called Tyee park (please correct me if I am wrong).
Also the second bridge off of HWY 138 has good bank access from what I hear, but I have never tried that one out first hand.
Either way, your probably going to kill 'em, the Umpqua is the greatest for smallie action...
I just fished the Umpqua starting at Elkton and floating about 4 miles. There were fish everywhere but fewer right in Elkton because of the bank access. Fish where there are ledges dropping off deep. Your best bet might be looking for a wide spot in the road and walking to the river. The shad in the river are about 3 inches now. A lot of bass we caught were caughing them up. We had best success with 3" senkos, wacky rigged with a small weight either slipping or pegged close to or far from the hook. Also did well on the drop shot. I caught close to 100 fish in 8 hours -- kind of slow.