I have been hiking to Fossil springs since 1968, at that time the upper trail was little more than a game trail, pretty rough. I don't hike that trail anymore,too many people who aren't prepared and I usually get upset at all the trash thrown off the side of the trail. I hike the flume road now, there seems to be a different breed of hiker which treks from there. Very little trash (less for me to haul out) plenty of water all the way if you have a filtration pump. Just dip your intake hose into the flume itself and take a long swig.
My daughter and I hiked there in October of '02, there were about 30 boy scouts who had litterally taken over the westside main camping area. We ended up camping just above the dam.
Hoist your packs up in the air after setting up camp, Javelina and skunks are all over the place. Not much fun finding your pack shredded by a pack of Javelina. I would suggest keeping your dogs on a leash at night, if the skunks don't get them the Javelina will tear them up.
If you hike from the springs and follow the flume road down to fossil creek and continue about 2 miles downstream, keep looking up high on those flat top promotories and you'll see a lot of ruins. Some on the west side still have complete walls which form a net work of Kivas, pottery abounds everywhere. My friend just found the bowl off of a peace pipe (I guess) that a gopher had dug up, perfect condition!!
Be careful hiking that trail in the summertime. Temps can reach to 120 degrees on the flume road, and shade is scarce the first mile or so. Rattlesnakes abound in the cool shade of the flume, if your dogs aren't "snake aware" leave them home!!
Enjoy.....might see you up there sometime