Pacheco Marsh

Empty containers from the planting of over 31,000 natives are stacked at the Lower Walnut Creek Restoration Project in Martinez, Calif., on March 31, 2022. (Ray Saint Germain/Bay City News)

A temporary irrigation pipe, installed to care for the recently planted natives, at the Lower Walnut Creek Restoration Project in Martinez, Calif., on March 31, 2022. (Ray Saint Germain/Bay City News)

Paul Detjens, Contra Costa County Senior Civil Engineer and Program Manager, talks about the flourishing native growth at the Lower Walnut Creek Restoration Project in Martinez, Calif., on March 31, 2022. (Ray Saint Germain/Bay City News)

Recently planted natives are protected from the elements with milk cartons at the Lower Walnut Creek Restoration Project in Martinez, Calif., on March 31, 2022. (Ray Saint Germain/Bay City News)

An aerial target panel used for surveying is installed at the Lower Walnut Creek Restoration Project in Martinez, Calif., on March 31, 2022. (Ray Saint Germain/Bay City News)

Recently planted natives are protected from the elements with milk cartons as California goldfields and poppies bloom at the Lower Walnut Creek Restoration Project in Martinez, Calif., on March 31, 2022. Oil pipeline and terminal company Transmontaigne Operating is in the background. (Ray Saint Germain/Bay City News)

California goldfields bloom at the Lower Walnut Creek Restoration Project in Martinez, Calif., on March 31, 2022. (Ray Saint Germain/Bay City News)

Temporary irrigation pipes run through recently planted natives, protected from the elements with milk cartons, and California goldfields at the Lower Walnut Creek Restoration Project in Martinez, Calif., on March 31, 2022. Oil pipeline and terminal company Transmontaigne Operating is in the background. (Ray Saint Germain/Bay City News)

Milk cartons protect recently planted natives at the Lower Walnut Creek Restoration Project in Martinez, Calif., on March 31, 2022. (Ray Saint Germain/Bay City News)

Milk cartons protect recently planted natives as California goldfields and poppies bloom at the at the Lower Walnut Creek Restoration Project in Martinez, Calif., on March 31, 2022. (Ray Saint Germain/Bay City News)

Milk cartons protect recently planted natives as Arroyo lupines, California goldfields and poppies bloom at the at the Lower Walnut Creek Restoration Project in Martinez, Calif., on March 31, 2022. (Ray Saint Germain/Bay City News)

Recently planted lupine grows as California goldfields bloom at the Lower Walnut Creek Restoration Project in Martinez, Calif., on March 31, 2022. (Ray Saint Germain/Bay City News)

Delta water fills channels at the Lower Walnut Creek Restoration Project in Martinez, Calif., on March 31, 2022. (Ray Saint Germain/Bay City News)

The location of one of three kayak launches to be installed at the Lower Walnut Creek Restoration Project in Martinez, Calif., on March 31, 2022. (Ray Saint Germain/Bay City News)

A coyote walks through recently planted natives at the Lower Walnut Creek Restoration Project in Martinez, Calif., on March 31, 2022. (Ray Saint Germain/Bay City News)

A sprinkler, part of the temporary irrigation system, water recently planted natives at the Lower Walnut Creek Restoration Project in Martinez, Calif., on March 31, 2022. (Ray Saint Germain/Bay City News)