Those are some pretty impressive 'stacks'.

>From my sister in the Bay Area

https://marinaudubon.org/event/vauxs-swifts-at-mcnear-brick-and-block-san-rafael/

Bob OBrien Poertand

On Mon, Sep 22, 2025 at 10:58 AM Larry Schwitters via Tweeters <
tweeters at u.washington.edu> wrote:


> You do know the swifts abandoned Portland Chapman last September. JBLM was

> abandoned this September. Monroe Wagner hasn't seen a feather for a week.

> Rainier Riverside Church still has thousands. It is suspected there is a

> connection. For the last ten years more and more of the southbound

> migrating swifts have been spending more and more time at a large

> industrial roost near North SF Bay. We've documented over a million

> roostings there each of the last two years. This year it's gotten out of

> control. The swifts are going to roost in the middle of the afternoon and

> it continues nearly nonstop until too dark for humans to detect swifts.

> They clicked off 107,000 Saturday and got there later in the day Sunday and

> only got 101,000 clicked. Hard on the fingers.

>

> We got rain. Issaquah Hatchery got enough Salmon for an exciting Salmon

> Days.

>

> Larry Schwitters Issaquah

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