Thanks for your complement.  I am glad that the work on the trails in the park is appreciated.  Are you local to this area?  I have hiked/ran almost all of the trails on the west side of the park (there are a few very remote ones up north that I haven't gotten too yet).  I am currently working on updating access tags on the trails and setting informal=* and operator=* Regarding rivers/streams, sometimes you can use the USGS 3DEP data to accuractly locate them, this also can work for some trails.