A friend of mine borrowed my 22-250 for his texas javalina/hog hunt, he did well out to 200 yards.
But if its thick brush, which I assume since its near the river, you definatly want a larger caliber w/ a low power scope.
My best GWT spot has a ton of hogs as well. Happened to walk into a group on the hike out back in december.
20 ga. #2 hevi metal works well on piglits, but I didnt dare take a crack at the sow. Decided to make a few cut shells right there in case she came back for vengance.
Never hire a plumber to do a pipe layers job.