"Remains of a cairn on the summit of Low Raise. 9.0m in diameter and 1.0m high." According to ADS.
I've been on High Raise more times than I'd care to mention for fear of ridicule. I've only been on the ridge down over Low Raise once. I knew about the cairn, but was still surprised to find it in a place where there was nothing but grass. No outcrops, no rock beneath the immediate few feet of surface, just peat.
This is a lonely place, make no mistake, just a faint trace of flattened grass to show that others had trodden there once or twice. Go there when the mists are swirling over the hills, as I did, when it seems that you'll never see more than a few feet of sodden fellside for the rest of the day. The cairn looms out of the mist like a great leviathan out of the depths. It looks like there is a quarry a few feet to the west, but seems too shallow to have excavated that much rock, and anyway, it's all far too rounded and regular.
This is a huge cairn for the area. Even on the surrounding rocky peaks the modern summit cairns are small. High Raise is an exception, and there lies another site.
Descending down to the Iron Age hillfort of Castle Crags, Haweswater is shown to its best, full length.