Charles River drops below a beaver's knees in West Roxbury

In California: "Riverine wetlands rebuilt by beavers can counteract rising temperatures, nourishing vegetation that stores carbon and benefiting sensitive species including steelhead trout. Spreading water across the floodplain creates a network of firebreaks — gaps in combustible vegetation that can stop or slow wildfires. And beaver wetlands help combat drought because their dams raise water levels so the ground stores water like a sponge, percolating out in drier seasons, which keeps streams flowing instead of going dry."
https://www.latimes.com/opinion/story/2022-07-25/climate-change-beavers-...

"Beavers are an untapped, creative climate solving hero that helps prevent the loss of biodiversity facing California. In the intermountain West, wetlands, though they are present on just 2 percent of total land area, support 80 percent of biodiversity. Further, beaver dams improve water quality and control water downstream, repair eroded channels, reconnect streams to their floodplains, and the ponds and flooded areas create habitat for many plants and animals. Beavers create habitat complexity, significantly increase biodiversity, and can provide perennial flow to streams that would otherwise run dry. Through this process of ecosystem engineering, beavers can expand wetland, riparian, and wet meadow habitats and increase wildfire resiliency in areas with known beaver activity."
https://esd.dof.ca.gov/Documents/bcp/2223/FY2223_ORG3600_BCP6018.pdf