Construction and revegetation at Ackerson Meadow are complete, and now it’s time to let nature do the work it does best! This marks a huge milestone in the movement towards headwaters restoration in California’s Sierra Nevada, with the Ackerson restoration standing as the largest full-fill meadow restoration in the Sierra Nevada and the largest wetland restoration in Yosemite National Park’s 135 years. … 150,000 cubic yards of soil and 434,000 wetland container plants later, water is flowing across the entirety of this fully restored meadow.