![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEidHRbqRQyLfIm-jWE_uGti9p5SbGnE2y-eCWlEXj1RT66TH4VOs816sRDtnp9KnWwDzqI__LePxd93BUEBc-GMTeuJfDQkbLIZirwOro9MVjPx8Ww9EFGXAKySMl-lhC1OVF1ffQ/s200/Birdtrip_14.jpg)
Quoting from the U.S. Fish and Wildlife Service brochure: "Today, over 90% of California's wetlands are gone, along with the grizzly bear. The ability of the valley rivers to create new wetlands naturally is largely prevented by levees that have been constructed to confine flows for irrigation and flood control. However, the birds continue to fly their ancient routes along the Pacific Flyway, and crowd into the remaining wintering habitat. The Refuges provide a significant amount of the wintering habitat for waterfowl in the Sacramento Valley. . . In 1937, with the establishment of Sacramento NWR, managers and biologists worked to transform the Refuge's dry, alkaline lands into productive marshes. The Civilian Conservation Corps, using bulldozers and tractors, began creating marshes and ponds."
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgoif-_WkxuxTK3o1mjFosZFL01kzYNYgl2_gZRAAA9zkZw66NKk8X5xB-DhDItwUra6cERHjRWB-j4lqF2kmW9s4II4y0CBArpUvzIdZfPfUkneZBKavLllPZ-Kbmk_cDaMW5eWw/s200/Birdtrip_45.jpg)
Amazing what you can do when you improvise. You can see it all chronicled here: Dave Skinner Photography