Hang on, is that really how the grease works though? In my experience, a lot of sealed bearings come pre-packed and the seals are meant to keep water OUT, not just keep grease IN. If you're blasting water directly at a seal that's already worn or cracked, yeah, that's a problem. But a little overspray from a hose isn't usually enough to push past a good seal and wash out the grease. I've actually seen more pumps die from people not checking and replacing worn seals or just letting mud cake dry on the fittings, which causes corrosion. The real killer is letting things sit wet for days, not a splash during a wash.

That reroute through a creek bed sounds like a total nightmare. It's crazy how one bad storm can completely change a trail to the point where GPS data from last year is useless. I've seen it happen a few times in the Cascades where the "new" route is just a scramble until they get real funding to build a proper path.