The Hot Spring:
At Foster Ranch Hot Spring there is a very well built rock and concrete tub and a primitive shower. The spring is located over 10 miles in the Frank Church Wilderness on a parcel of private property in the middle of Warm Creek Valley. The property is obviously well maintained with cabins, manicured lawns, and an air strip. The spring is located around a bend from the cabins, so you can not see the buildings, and feel like your in the middle of wilderness (which you are). The property owners allow access through their property for the National Forest trail (please close all gates). According to the Hot Springs and Hot Pools book they also allow soaking at the spring as long as they are respected by always being left clean and that no one camps near the tub. Based on comments on this website the owners do not allow passerby's to soak in the pool.
Whoever built this tub did a very good job building a 5 foot diameter tub with neck deep water when sitting. A drain pipe is located at the base of the tub so you can drain and clean it. 135 degree F source water is piped directly from the source up on the hill into a pvc pipe that go to both the shower and the tub. The water usually constantly flows into the tub keeping the water temperature just about perfect at 104-106 degrees F. A valve in the pipe opens water to the shower that has a bucket in it protecting the Dr. Bronners soap. Built around the tub is a wooden deck, lounge chair, and small room where half is for the shower and half for changing.
About a half a mile away from the Foster Ranch Hot Spring there are more hot spring sources that are not on the private property. These springs are just around the bend downstream and then up a small creek tributary. There are several hot spring seeps along this creek with the most flow from the first source. There is a lot of potential for these springs to be soakable if a pool was built. Someone could camp at these springs and spend some time making it soakable. Perhaps if the land owners of Foster Ranch built a small soakable pool near these springs they could keep unwanted soakers from their pool, while also helping out the hot spring community.