Several support rods exist on top of the remnants of the dam. They are all bent at a 90 degree angle, as this one indicates. I have no idea what they were used for.

Angled support rod on the old dam
Aperture: f/4 Shutter Speed: 1/80 sec Camera: Canon PowerShot A620
Focal Length: 21.709 mm Flash Mode: No Flash Date Taken: March 31, 2007 at 1:30 PM

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