In October 2019 the Santa Clara Valley Water District began the cleanup of the river channel near our apartment. Their first efforts are removing stands of phragmites and cattails from the channel inside the levee.
Both these two invasive plants grow quickly and produce a dense growth that restricts water flow, and provides stagnant pools of water that encourage mosquitoes.
The Marsh Master pictured above is used to mow the invasive plants. This picture was taken near the mouth of the Guadalupe River into the bay.
The picture below shows the same plants being cut down with weed whackers.
And here was the final result. The stacks of debris were hauled away in large trucks. Quite an undertaking!