Well, I spotted far more than that. A fairly major change in that Cemex had cut a channel to the culvert.
I came back at 7.00pm, with my trusty bridge camera, to find that Cemex had been exceedingly busy. I couldn't miss the opportunity, so nipped over the gate into the area around the culvert.
It was getting quite dark by this time. Not only was the sun setting, a nasty black cloud was making its way toward me.
By the time I took the last dozen or so photographs, it was very gloomy. My camera did something it had never done before. It informed that it was going to take a nighttime shot, and was going to take multiple pictures and combine them all into one.
I did my best to hold the camera as steady as possible (I didn't bring my tripod or monopod), as it proceeded to take about half a dozen photos. I really expected the resulting photo of combined shots to be fuzzy, and so was quite amazed when they weren't. No idea how the camera did it, but no way did I hold it dead steady.