See Alisma plantago-aquatica (Water Plantain) from the (downhill) creek line. Maybe a spent seed stem of water plantain that broke off and was blown around? I think to remember there was water plantain growing along the edge of the lower dam of the twin dams. I haven't checked the dams and the creek line for a while.
Ciaran Consider Sisyrinchium rosulatum, it likes wet areas and is small, like your photos seem to show. But maybe would not have such long stems shown in one photo.
Thats a very good suggestion, I had a look around on Inat and there are similar photos. https://www.inaturalist.org/observations/120115651 https://www.inaturalist.org/observations/117268956 https://www.inaturalist.org/observations/120291671
Probably also explains why I had difficulty finding foliage.
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