In April 2009, the environmental group American Rivers declared the Sacramento River Delta the nation's most endangered waterway system. The Delta's environmental problems include pollution, declining fish populations, and aging levees.
The drainage basin is one of California's most important natural resources, providing drinking water to two-thirds of the state's population. Covering thousands of square miles of California's land, the Delta is home to approximately 22 species of fish, including the Delta smelt, a key indicator species for the health of the Delta's ecosystem that in 2004 was found to be on the edge of extinction.
March 20, 2010 6:00 AM PDT
Photo by: James Martin/CNET
| Caption by: James Martin
Conversation powered by Livefyre