Black tubing ran 0.22 miles SW back to the undercut alcove vicinity. No spring on topo.
Nearest pre-wilderness road is 0.22 miles NNE
Tubing looked in great shape, double run too.
Then noticed it went under a huge prickly pair and back out the otherside.
Had to have been 10-15 years old. I know it grows quicker than most realise. Then neighbors by St Maria Goretti used a machete to clear their driveway of a wall of prickly pair every so often to get their efficient 4mpg motorhome in the tiny driveway.