Nest is located atop a power pole right at the Lahontan Dam within the Nevada State Park of the same name.
What to look for
Look for 2 adults on the nest. The adult pair will show pair bonding behaviors such as vocalizations, aerial sky dances, and the male feeding the female fish. You may see the pair copulating, which typically begins 14 days before laying eggs.
Females will lay 1 - 4 eggs at a rate of one egg every 1 - 2 days. After laying, incubation starts. Look for adults taking turns sitting low in the nest incubating eggs. The incubation period can last 35 - 43 days.
Chicks hatch ~39 days after incubation begins. Look for adults bringing food to the nest and making "head bows" into the center. Chicks typically can't be seen until they are 2 - 3 weeks old, so feeding behavior is the only way to know chicks are there.
Around 4 weeks after hatching, look for the heads of chicks to show over the rim of the nest, particularly when adults bring food to the nest. Other times they lie flat and are harder to see. Count the number of chicks in the nest before they learn to fly
Chicks begin flying around 7 - 8 weeks old, and are still fed by the adults. Count the number of chicks who have successfully fledged the nest and are observed flying.
Chick Last Observed
4 - 10 weeks after fledging, chicks begin leaving the nest area to migrate south, once they have learned to fly and feed themselves. Record the date that the last chick left the nest.
Look for signs of nest failure like adult abandonment, adults no longer incubating eggs or feeding young.
6/07 Very windy. One adult very low in nest, incubating? Later, moving sticks around. Second adult returned with a fish, deposited it in the nest, and the female appeared to be feeding unknown number of young. At times she wukd also take a piece and feed the adult. He remained on the nest edge for 30 minutes, then flew off. NOTE: It appears two separate sparrow families are nesting within the osprey nest.
Lahontan State Park rangers stated this nest had produced young the previous five seasons. They were turning eggs just two weeks ago. I was able to sort through the materials on the ground, but no evidence of this year's eggs or chicks was found.
5/17/18 This nest was first reported to me as being occupied by Bald Eagles. I visited the site on May 6, and found it occupied by two osprey. The nest is huge, and a park ranger informed my this is the fifth year of the nest being there. I will monitor over the season.