I didn’t have a very accurate way to get coordinates, so I don’t know how far off they are. I will be back to get accurate coordinates sometime in the near future.
This cache is in a cave known on Google Maps as Rock Canyon Cave. To get to the cave, keep going left along the river immediately before the fourth bridge on the Rock Canyon Trail. The trail goes up a few feet above the river and continues for about a quarter mile where it meets back up with the Rock Canyon Trail by the fifth bridge. About 200 yards up this trail, there will be a cave on the left next to a fire pit. The cache is placed inside the cave. Make sure to cover it well when you leave as it is visited somewhat often by muggles. Log, pen, and trading items are inside. Make sure you bring a flashlight!