San Francisco Bay

Osprey Days June 25-27 2021


COVID19 Era 2021 San Francisco Bay Osprey Days

The San Francisco Bay Osprey Days is still in a COVID19 Era style. Please know that we have been scrambling to piece together guided social distanced hikes in the Mare Island Preserve, extra car caravan tours of nest sites throughout Mare Island and even one off the Island, boat trips with 25% fewer passengers and an option of an In-person or Zoom or Facebook Live for our science 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?!

Event Advisory as PDF and Word:

Event Advisory 9th Annual Osprey Days Jun 25-27, 2021 .pdf

Event Advisory 9th Annual Osprey Days Jun 25-27, 2021 .docx

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, follow all laws regarding where to WEAR A MASK. It’s a good idea to continue 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!

It’s been 18 months since our non-profit organization, the Mare Island Heritage Trust was dismissed and expelled as day-to-day managers of the Mare Island Island Shoreline Heritage Preserve, which we founded and funded through your donations, with NO money from the City of Vallejo. This action, by what we are understanding more everyday, that of a rogue City Manager, continues to be mind-boggling, unprecedented and part of a much larger bizarre twist of events affecting department and programming throughout the whole City.

This has been a huge challenge in terms of bringing our Osprey Days to you again this year. We have no visitor center, so we are going to make-do with some canopies and chairs set up underneath, at the entrance gate. The temperatures are the usual early summer warm and we just didn’t know how else to host you this year. Another fall-out of this action towards us without cause, by the City, is that once again, we cannot visit the Historic Southshore nest sites located on Navy property. Why? You guessed it! The City refuses to request access from the Navy or ensure City staff support for our access.

Sign and Share Our Online Petition

Please, if you would, visit our website for the Preserve, to learn about this upheaval and what you can do, including signing and sharing our petition to restore us as skilled and gentle land trust managers of the Preserve and donating to our nonprofit organization. (Please DO NOT make a donation on the petition site, Changedotorg, 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. The good news is that more than 8,100 Preserve Users and lovers like you, have already signed our petition. We ARE letting our elected City Council know we want things to change!!

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 2021 nesting season, we have documented as many as 56 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 even into the South Bay near the Dunbarton Bridge. 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. This year, there are 56 documented nest sites throughout the Bay Area.  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 is headquartered in 2021 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. we have made every effort to plan our schedule with COVID19 precautions, so please comply with them for the safety of all participants.

June 25-27, 2021 Schedule (pdf)

9th Annual Osprey Days on Mare Island

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

2021 SPONSORS: Southern Land Company the master developer for Mare Island, Dolphin Charters and Belinda Seidemann. Visit dolphin charters or call 510-527-9622 or 1-800-472-9942 to reserve for one of the 4 boat trips during our San Francisco Bay Osprey Days trips 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