Sierra Valley, east of Portola is one of the better known birding locations on the Sierraville Ranger District. The best birding is during the spring and fall, but interesting species can be found generally any time of year. For a loop tour, travel on Highway 70 to the Nirvino Airport east of the community of Beckwourth. At the east end of the runway, turn south on County Road A-24.The road crosses several riparian areas where waterfowl can be spotted. Follow the paved road about four miles until it reaches a ranch, and take the right fork, which is Marble Hot Springs Road. The road makes a right turn and then becomes gravel. There are several wetland areas that are attractive to waterfowl. The road eventually intersects with County Road A-23. Turn north and you will return to Highway 70. Birders may spot white faced ibis, sandhill cranes, American bitterns, black crowned night herons, Canada geese and a variety of ducks and songbirds. The Sierra Valley is also well known for its population of raptors including bald eagles, golden eagles, hawks, prarie falcons and kestrels.
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