Hi, I think I may be able to help you find the start of the Old Big Oak Flat road in the valley. Me and my husband did a walk up here in early June this year (our third trip to Yosemite - from the UK). You need to look for the valley road marker V9. This is a small post on the north side of the road probably a couple of feet high. It's about 0.5 mile after the El Capitan bridge. There is stillby Ascott - Yosemite and the Sierra Nevada. News & Discussion