From my car at the Oregon Bar parking lot, to the point where I estimated the first tunnel was located, is a little over 2.65 miles. However, those 2 miles, along the river, over the river cobble, cliffs, and sand bars is some of the most challenging and strenuous terrain I have hiked over. There are points where bare rock juts into the river and you must literally climb up and over the slate or granite.
