We have the same problem, and there is NO easy way to fix it. We can not afford, pipes and this or that, we just try to deal with it by feeding in the higher spots, and keeping it clean out the best way we can.
It is a constant mud battle in the PNW. This is what I do Fall/Winter/Spring: -Take pictures of drainage/mud issues (because I definitely forget by summer) while it is wet out Summer: -Use tractor to grade/create burms and swales around and in paddocks to direct water -Fill in low spots We also use expanding plastic panels from http://www.lighthoof.com in the worst areas, which is usually in the front of the paddocks where the horses wait to get turned in.