Rock bivouac is a natural shelter site on the true right bank of the Earnslaw Burn, located just before the tree line ends in the upper valley.

The overhanging rock is large enough to accommodate campers and is fitted with a sleeping platform and a few old mattresses, making it a practical refuge in wet or cold conditions.

Reaching it requires a river crossing from the main track, with cairns on the far bank marking the way. Camping here is permitted on DOC public conservation land, though fires are subject to seasonal bans and no toilet facilities exist in the valley.

The surrounding area is prone to severe weather, flooding, and rapid temperature swings, so the bivouac's natural overhang can provide welcome shelter. Campers are expected to follow Leave No Trace principles and pack out all waste.