There are human factors affecting Arroyo Seco, but they are less dramatic than elsewhere.
A friend told me that before the bridge was built, the arroyo ran so hard it flipped a car and killed a friend.
Since they built the bridge, they’ve done things to protect the bridge and downstream residential property, including installing rock and wire reinforcements before the bridge. Below the bridge, they built levees on both sides to contain the flow.
Judging from the levees, the water must flow stronger to the right bank after the bridge. The area beyond is a wide wash.
Downstream the water may shift to the left.
The levee of that side become higher and wider, with more vegetation of both sides, presumably from more absorbed water.
Just before the arroyo crosses into the more recent alluvial soils, the water has carved an island.
The arroyo curves to the right, but there’s a spillway toward the left bank.
After the waters rejoin, the right bank is higher, straighter and more exposed than the left.
That flow continues to the confluence with the Río Grande, where the left side of the bottom is lower than the right and water flows back into the arroyo.
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