So get this: the Comal gets flooded each week with nasty, murky, grass-infested lake water via Landa Falls. I put up with about 2 dozen trains, each hitting the horn about 2 dozen times, from what sounded like about 2 dozen feet from my campsite (camped at Landa Park & could actually hike up to the tracks in about 10 seconds from the tent) ALL NIGHT LONG. Gear up in the A.M., super excited to hit the water, and literally as I'm doing my pre-entry reg check the stopgates opened and the river went from crystal to septic sludge (at least it smelled that way). Needless to say, I'm quite pissed off about the whole thing, especially given that I drove about 4 hours for this little weekend trip and got maybe 27 seconds of sleep last night.
So, word to the wise: Don't even think about diving the river the first half of the week, since the lake water floods all day, usually mondays or tuesdays. And unless you're deaf, don't camp out at Landa Falls RV Park. I went to school in College Station for 4 years and didn't hear as many trains during the whole experience as I did last night.
EDIT: Even after having a throughrough scrubddown in the shower I still reek like that decomposing lake water the "authorities" ruin the river with (I had to get into the midst of it to recover a lost fin). Just dandy.