We walked past the Red Oaks Mill dam on a mild and dead-calm afternoon, with the headwater like a mirror:

I liked the smooth curves formed where the surface drops through the rubble:

We wonder how far upstream the dam affects the water level, because, after it completely disintegrates and washes away, the creek level will definitely fall. The flow rate surely makes the calculation more difficult than just tracing contour lines from the dam breast upstream until they meet the bottom of the channel…