Hard to believe, but this cache location was underwater on Memorial Day 2015.
The old low water crossing was gone way before then but the new bridge had 8 feet of water flowing over it!
http://oldagguns.com/wp/rr12-bridge-in-wimberley-closed-indefinitely
https://www.youtube.com/watch?v=ZmKcA7s9mZI
http://waterdata.usgs.gov/usa/nwis/uv?site_no=08171000
Small pill bottle
Bring your own writing stick.