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Gerald Callahan

@geraldcallahan.bsky.social

Immunologist | Author | Professor | Friend geraldcallahan.com

57 Followers  |  34 Following  |  16 Posts  |  Joined: 29.12.2025  |  1.4299

Latest posts by geraldcallahan.bsky.social on Bluesky

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River Odyssey is about time I’ve spent, mostly on the Colorado Plateau, looking for those gaps I mentioned, the spaces in the cheese of the world. The story isn’t finished, of course. Hardly any story ever is.
geraldcallahan.com

11.02.2026 15:59 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
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The book became something else. Something with tree toads in it and the dark of the sky at night. Something that smelled like desert rain and wet creosote. Something necessaryβ€”for me, at least.
geraldcallahan.com

10.02.2026 15:02 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
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Then, standing one afternoon in an ice-cold plunge pool deep in the Colorado Plateau, I got the idea of putting what I'd written into a book. A book in defense of all thisβ€”humanity, rivers, canyons, fear, depression, aging. But that isn’t what the book became.
geraldcallahan.com

04.02.2026 15:48 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
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I made a decision. A decision to close some of those gaps. And I chose the river as a place to begin. Somewhere along the way I started writing the words down. And somewhere else along the way I realized I was doing more than just writing.
geraldcallahan.com

03.02.2026 16:29 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
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And I realized the Colorado River was the first river I’d seen from both ends. But as quickly, I realized I knew nearly nothing about all that lay between where I stood and the place where the river died. There was a gap.
geraldcallahan.com

02.02.2026 15:56 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
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A couple of years before, a friend and I had spent a winter week in San Felipe, near the northern end of the Sea of Cortez. As I stood there, on the La Poudre Pass Trail, I remembered the tidal flats at San Felipe spread like San Pasqual's apron across northern Mexico.
geraldcallahan.com

01.02.2026 17:07 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
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It began five or six years ago among the peaks where the day’s first fire is dancing now. I was walking a trail once called the La Poudre Pass Trail, now called the Colorado River Trail. That trail follows the first seven or so miles of a growing stream that becomes the Colorado River.

30.01.2026 17:51 β€” πŸ‘ 0    πŸ” 1    πŸ’¬ 0    πŸ“Œ 0
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Up there, among the frozen spires and crumbling stone, as each day begins the waters of this continent assemble. Then, carefully as Moses, they divide themselves into rivers. Rivers that will this day and on all others to come, change the lives of every living thing.
geraldcallahan.com

29.01.2026 23:25 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
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That light begins nearly crimson, puddled among the ice fields and wind slab that drape the rigid tips of the winter Rockies. Then the day moves, gathering speed, down the 9,000-foot facesβ€”red, to gold, to ice whiteβ€”and finally spills out across the plains.
geraldcallahan.com

28.01.2026 21:08 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
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Mostly the sky is dark, a wombful of stars. But east of here the cauldron’s lid has been lifted, and through the crack I can see the final flame. It will be months, though, before the warmth of that fire reaches me.
geraldcallahan.com

24.01.2026 18:54 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0
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It’s 5:30 on a Saturday morning, hard into the Colorado winter. An hour ago my feet felt like I imagine Maurice Herzog's feet must have felt up on Annapurnaβ€”just before most of his toes had to be removed.
geraldcallahan.com

22.01.2026 23:26 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
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Every story must have a beginning. Whether or not a story has an ending is not so important. In fact, some of the best stories ever begun were completely spoiled by their ending. But a story must have a beginning. And though much has already happened, this is the beginning of this story.

13.01.2026 21:54 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
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I no longer remember when I first noticed. Perhaps it was on one of those nights I stole away from the world of people and swam in the tepid ink of a night sea. Perhaps it was an afternoon standing above the arch at Land’s End watching water turn desert stone into sand.
geraldcallahan.com

05.01.2026 21:59 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
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As it rises, the canyon cuts more deeply into the stone, now five hundred, maybe a thousand feet below the sky-capped rim. As I sit, the sun on my back, a snake of contentment uncoils inside of meβ€”an odd sense that, for this moment, it doesn’t matter, any of it.
geraldcallahan.com

31.12.2025 19:05 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
Colorado National Monument

Colorado National Monument

And although it’s true that I rarely find what I imagined I wanted when I set out into the desert, I rarely return without something I neededβ€”a stone, a bird’s song, a thought, a view deep into the meat of the earth, a single red blossom amid a sea of yellow stone.

30.12.2025 23:03 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
Utah desert at sunrise

Utah desert at sunrise

And above it all rise the hard blacks and brown and ochres of the high Utah desertβ€”a broken place, and because it is broken a place where anything is possible.
geraldcallahan.com

29.12.2025 21:11 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

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