San Francisco Bay

Osprey Days June 25-27 2021



COVID19 Era 2020 San Francisco Bay Osprey Days

The San Francisco Bay Osprey Days COVID19 Era style took place July 4 & 5, 2020. The uncertainty and ever transforming issues associated with COVID19 certainly impacted our effort to put this event on again in 2020.

Please know that we have been scrambling to piece together guided social distanced hikes in the Mare Island Preserve, car caravan tours of nest sites throughout Mare Island, boat trips with ask much as 75% fewer passengers and a Zoom presentation about Osprey in San Francisco Bay. The exciting’s all going to happen. And, on VERY short notice. So, help us get the word out, won’t you?! We have created activities in this event with COVID19 response first and foremost.Therefore, this year’s Osprey Days will be VERY DIFFERENT than past events we have hosted on Mare Island including Osprey Days.

As with all other COVID19 safety precautions, for ALL activities in this event, you are required by law to WEAR A MASK when you must be closer than 6 ft. social distance minimum and when indoors. Please make every effort to maintain 6 ft. social distance and, wash your hands and use hand sanitizer! Be safe. Be well. Be kind. Easy peazy!

Update about the crisis of leadership at the City of Vallejo City Manager’s office regarding the Mare Island Shoreline Heritage Preserve and what you can do!

But, so, too, has the unprecedented and bizarre twist of events prompted by the City of Vallejo, which has removed our nonprofit, the founder and funder through your donations, of the Mare Island Shoreline Heritage Preserve, the Mare Island Heritage Trust, as the day to day operator of the Preserve. This has been a huge challenge in terms of bringing our Osprey Days to you this year. Please, if you would, visit our website for the Preserve, to learn about this upheaval and what you can do, including signing our petition to restore us as managers of the Preserve and donating to our nonprofit organization. (Please DO NOT make a donation on the petition site,, as none of those funds go to us!) Scroll to the bottom of this page for information on sending a check, or making a direct Paypal donation.

Celebrate Osprey Nesting in San Francisco Bay

Our Osprey Festival celebrates the relatively new phenomenon of osprey nesting on San Francisco Bay. The smallest of the eagles, osprey still thrill enthusiasts with their amazing fishing skills, distinctive markings and familiar call. Nesting osprey are common on waterways and lakes throughout the world. Yet, osprey are not documented to have nested in the San Francisco Bay in the 20th or 21st centuries. Since about 2003 the Bay Area has seen a explosion of nesting sites. In this 2020 nesting season, we have documented as many as 100 nests in San Francisco Bay from our humble beginnings at the end of Pier 34 on Mare Island in the Mare Island Shoreline Heritage Preserve. The first documented nest was observed on Mare Island as early as 1999/2000 by Napa Solano Audubon Society field guides Robin Leong and Wally NeVille.

Growing up...

The population began to grow rapidly in the Bay Area with documented nest sites from Mare Island and Vallejo to Rodeo, Richmond, Alameda, the Oakland Estuary, the Bay Bridge and San Francisco, and possibly further into the South Bay. This rapid expansion of nest sites is demonstrated at Richmond where there were 3 nests in 2014, 11 nests in 2015 and in 2016 there were 13 nests. Watch a live 24/7 webcam of the osprey pair on the whirly crane at the Red Oak Victory Ship in the Richmond Harbor. Thank you Golden Gate Audubon Society and team! The birds’ names? Rosie for “Rosie the Riveter’s and the Rosie the Riveter WWII Homefront National Historic Park in Richmond...and Richmond!

You have a role to play, so let’s get together!

As much as anything, the identification and regular observations of the Bay’s nest sites has been through the reporting and monitoring of “citizen scientists”. You are invited to spend the weekend with us, or just an afternoon, to learn about ospreys, their unique nesting in San Francisco Bay and what you might contribute to the ground-breaking research with your eyes and ears, or by helping us fund webcams, banding and other research tools.

San Francisco Bay Osprey Days will take place on Mare Island and at the Mare Island Shoreline Heritage Preserve located in Vallejo, Calif. Join us June 25-27, 2021 for guided hikes, driving tours and boat trips to see nesting osprey up close and plenty of fledglings and adults in the sky above. See the COVID19 precautions we took kin 2020 and may have to return to in 2021. year and please comply with them for the safety of all participants.

Tentative 2021 DATE

9th Annual Osprey Days on Mare Island

Friday, Saturday & Sunday, June 25-27 , 2021

  1. Visit dolphin charters or call 510-527-9622 or 1-800-472-9942 to reserve for one of the boat trips throughout the Spring and Summer of 2021, including our San Francisco Bay Osprey Days trips expected to take place Saturday, Jun 26 and Sunday 27, 2021

Please make your donation to Osprey Days and the Bay Area osprey tracking tools project payable to: 
Mare Island Heritage Trust
816 Branciforte St. 
Vallejo, CA 94590

Donate  online:
Call/text: 707-249-9633
Email: myrnahayes@mac.comhttp://www.mareislandpreserve.com

Photos: lower left and this; Eric Dugan,

Old Sperry Mill, Vallejo, CA

Photo: Jimmy Sarmiento,

Glen Cove, Vallejo, CA


June 25-27, 2021