WUK437, Los Angeles, sounding on 5015.0, 5400.0, 5437.5, and 5400 kHz USB ALE.
Other possible USACE freqs worth trying are 3345.0, 5327.0, 6020.0, 6785.0, 9122.5, 11693.5, 12070.0, 12122.0, 12267.0, 16077.0, 16326.0, 16358.0, 16382.0, and 20659.0, all USB ALE.
The USACE is responsible for levees and flood walls in the Louisiana area.