This isn't much of a report, I'm out camping and haven't had a chance to check my computer log yet.
Canyon Lake:
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Vis is definitely better than 10 feet at the Southwest end of the dam, from Sfc. down to 50'. At 50' the vis. might have been starting to deteriorate, however this could have just been lack of light. It was cold enough to give me the shivers, in a drysuit, with 2 layers of undergarments, after 30 minutes.
San Marcos River (3 places)
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* Falls just downstream of Spring Lake: Normal (great...40') visibility, hardly any tubers. Hang out in the big concrete tunnel just to the left of the falls, when you're facing the falls. Water level: Doesn't quite touch the deepest concrete step.
* City Park: Vis 10-20', current strong in between huge mats of Hydrilla overgrowth, no-one there. Hydrilla is a terrible plant around these parts, but it's fun to get "lost" in at night in the shallow water, with big schools of minnows chasing your light. Big Plecostamus catfish.
* Rio Vista Park: Immediately under and downstream of the railroad track is an excellent place to see structure, plants, and fish in an area that is deeper than the rest of the river in this area. I'm no expert and it was my first time at this location but it was fairly amazing. Think like a fish; get behind big mats of Hydrilla to get out of the current.
Comal River at Hinman Park & Upstream:
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Vis 5-10', depth: Mostly less than 7', but I found 12' immediately off of the steps at the park. Current slow enough to make good progress when swimming against it. This dive would be incredibly picturesque with direct sunlight. Saw many 16"+ black bass, one big Pleco, tons of different perch/sunfish/sun bream/bream/bluegill LOL. It was a great dive starting at dusk and ending about 1.5 hours later. I was looking the entire time, I never found the threatened Fountain Darter, although I have seen them in the San Marcos Rvr.