The last decade has seen a remarkably rapid expansion of nesting Ospreys along the San Francisco Bay shoreline. The first record of an Osprey nest was on the Mare Island in Vallejo in 1990. In 2003, the number of nests began a steady climb and expand. In 2012, a census of Osprey nests found 15 successful nests. By 2016 a total of 42 Osprey pairs were observed. Nearly all of the nests were built on human-made structures, such as light towers, cranes, and utility poles. Many of these are on derelict structures that may collapse or be removed, presenting a conservation challenge. A positive development is that in 2016, nine nests were on artificial platforms or modified utility poles.
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The last decade has seen a remarkably rapid expansion of nesting Ospreys along the San Francisco Bay shoreline. The first record of an Osprey nest was on the Mare Island in Vallejo in 1990. In 2003, the number of nests began a steady climb and expand. In 2012, a census of Osprey nests found 15 successful nests. By 2016 a total of 42 Osprey pairs were observed. Nearly all of the nests were built on human-made structures, such as light towers, cranes, and utility poles. Many of these are on derelict structures that may collapse or be removed, presenting a conservation challenge. A positive development is that in 2016, nine nests were on artificial platforms or modified utility poles.
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1187 Franklin Street, San Francisco, CA 94109
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