Note tapered stanchions on the side facing oncoming water. 1-rod LA River, downstream side of same overpass, looking north. Supports on the downstream side are simple vertical sections. Reseda Recreation Area above right. 1-05 Close up of 'slot'.
Water appears clean.
This hairy plantlife is found throughout the river. Not sure what the small downstream-facing diagonal groove is. A few inches in width, and mirrored on either side of the slot, these groves repeat every 50 feet or so at this section of the river. 1-07 Close up of one of the Reseda overpass supports. Rough river wall of composite material can be seen in upper right.