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There were fourteen rows of rocks or spurs along this bank. Note that water line between spurs is in scallop curves, see big collapse areas on high bank upstream. Each spur was built by a trackhoe advancing on it as a roadway with sloped sides. At this low water, you can see the bottom, with hardly enough cobble rocks remaining to walk on. Derrick specifies to within a degree the angle from the bank that will properly control water flow.