In the early hours of Saturday, the 24th of October, 2026, a river gauge on the San Juan at Shiprock, New Mexico, sent its last reading and went quiet.
A river gauge is a small, dull thing.
A pipe in the bank, a sensor, a solar panel, a radio.
It measures the height of the water every 15 minutes and sends the number to a server in Washington.
And for most of its life, nobody looks at it except hydrologists and the people who run the irrigation ditches.
The Shiprock gauge had been sending numbers for decades.
Flood stage on the San Juan there is 15 and 1/2 ft.
That Friday night, the river went past it and kept going.
And the gauge reported 20 ft, 21, nearly 22, the highest it had ever recorded.
And then it stopped.
Whether it was drowned or torn out or simply lost power, nobody could say that night because nobody could get to it.
The Navajo Nation’s president said the river was at about 23 ft by then with people on their rooftops.
200 mi downstream at the other end of that water is Lake Powell.
And 5 weeks before the gauge went quiet on the 15th of September, Lake Powell had been at the lowest level it has ever been.
The second largest reservoir in America, 1/5 full with a white ring on its canyon walls 180 ft tall.
I’m not going to tell you yet what that water did when it got there.
I want to follow it first from the mountain where it fell to the gauge that couldn’t keep up because the footage everyone’s sharing this week is of a lake going up.
And the lake going up is the least of it.
So, let me start on the mountain.
On the 21st of October, the remains of a Pacific hurricane called Trudy came ashore over the Southwest and ran into the San Juan Mountains of Southern Colorado and stalled.
That’s the word the forecasters used.
It didn’t pass over.
It parked on the high ground along the Continental Divide, where the San Juan and the Rio Grande and the Animas and the Dolores all begin.
And it rained for the better part of 2 days.
The numbers from the mountain stations are the kind you’d expect from a monsoon in the tropics, not from the Colorado high country in late October.
4.
8 in northwest of Los Pinos, 4.
7 near Monte Vista, 4.
4 at Wolf Creek Pass, which is a ski resort.
4.
4 southeast of South Fork, 3.
9 at Cumbres Pass, 3 in in Pagosa Springs by Friday morning, and nearly that at a snow survey station across the state line in Utah.
4 in of rain on ground that in a normal October would be getting its first dusting of snow.
And here’s the thing about that ground.
It’s steep, and it’s rock, and it’s been in drought for 25 years.
Dry mountain soil doesn’t soak up rain the way a wet meadow does.
It sheds it.
Every inch that fell on those slopes went straight into the creeks, and the creeks went into the rivers, and the rivers, which had been running at a trickle through the driest summer anyone could remember, became something else.
The San Juan at Pagosa Springs peaked at 9,230 cubic feet per second late on Thursday the 22nd, the third highest flow since the gauge was installed in 1911.
The Piedra, a tributary, hit 17,000, twice its previous record from 1970.
The Animas at Durango, 11,200, fifth highest since 1898.
The Dolores, eighth highest since 1896.
And on the other side of the divide, where the same storm was draining east instead of west, the Rio Grande near Del Norte ran at the third highest level since 1890, and its South Fork at the second highest ever, behind only 1911.
The Pagosa number is the one I’d ask you to hold, because it’s the one with the longest memory.
9,230 cubic feet per second, third highest since 1911, which means that twice in 115 years the San Juan at Pagosa has been bigger than it was last Thursday.
And both times were before anyone alive was born.
And both times were spring snowmelt in May or June, which is when a mountain river is supposed to flood.
This was October.
There is no October in the record that comes close.
The river did a spring flood in the wrong season, off rain instead of snow, in a year when the snow had failed.
Picture the map.
Every river that starts in those mountains, on both sides of the divide, setting or approaching a record on the same two days from a storm that arrived in the one week of the year when nobody expected one.
By Thursday night, the governor of Colorado had declared a disaster emergency in 11 counties.
And by Friday, it was 12.
Wolf Creek Pass was closed.
Red Mountain Pass was closed.
A bridge on US 160 at Park Creek washed away.
Recreational vehicles at a campground called Fun Valley were swept into the river.
A house near the Rio Blanco went into the water.
Near Cumbres Pass, water stood 7 ft up the walls of homes.
About 100 people had evacuated by Friday, and many more were simply cut off on the wrong side of a road that was now a river.
No one in Colorado died.
That’s the one number I was most relieved to read.
And before it got to New Mexico, some of it was caught.
Navajo Reservoir, the dam on the upper San Juan just inside the New Mexico line, took in about 215,000 acre-feet between the 12th and the 24th of October, and went from half full to 62%.
Two smaller lakes in the Colorado mountains, Vallecito and Lemon, which had been sitting at a little over half, filled to 86 and 83% in days.
Vallecito had been at 23% on the 1st of September.
Small reservoirs fill fast.
A big one barely notices the same water.
Hold that, because it’s the whole difference between what the flood did to a mountain lake and what it did to Powell.
And notice what it means.
Navajo Dam caught a chunk of the San Juan’s flood and held it.
What reached Farmington was what came in below the dam, from the Animas and the La Plata and the creeks and from the rain on the lowlands.
The towns flooded on the part of the river nobody had a dam for.
Then the water went downhill into New Mexico.
The San Juan River runs west out of the mountains into Navajo Reservoir and then out the bottom of Navajo Dam and across the northwest corner of New Mexico through Farmington and Shiprock into the Navajo Nation and on into Utah toward the lake.
And on Friday, the flood arrived at Farmington.
32,600 cubic feet per second.
The fourth largest flow since 1924.
And by the National Weather Service’s reckoning, the highest stage the river had ever reached there.
Hundreds of water rescues between Farmington and Bloomfield by Saturday.
The first estimate was 1,500 homes and buildings affected.
By Saturday, the weather service was saying thousands.
The flood got into the wastewater treatment plant at Bloomfield and raw sewage went into the river and down it.
The National Guard sent swift water teams, about 58 people.
One of them got an infant who’d been having seizures out of a family cut off near Chaco Canyon.
Shelters opened at the fairground and in two churches in Shiprock.
And then the river reached Shiprock and the gauge went to 22 feet and stopped.
The Navajo Nation declared a state of emergency.
The president’s office reported the river at about 23 feet overnight.
Homes and roads flooded.
Residents stranded on roofs.
Flash flooding was hitting Albuquerque and Lincoln County and the interstate at Acoma on the same Saturday from the same system.
New Mexico’s governor said, in a line that I’ve thought about since, “Right now, our focus is saving lives.
If you’re told to evacuate, go”.
And the water kept going west past the four corners.
There’s a gauge on the San Juan near the four corners monument where the four states meet that’s been recording since 1985.
On Saturday afternoon, it read 54,100 cubic feet per second.
The previous record at that gauge was less than a quarter of that, nearly four times.
That number is provisional, as the hydrologists say, meaning somebody will go out and check the site and recalculate when it’s safe.
But if it holds, it means that in 40 years of measurement, nobody had seen a quarter of what went past on Saturday.
And then, Utah.
On Sunday the 25th, with the water still coming, evacuations and road closures were ordered for Bluff, Montezuma Creek, and Aneth, three small communities in the Utah strip of the Navajo Nation along the lower San Juan.
The weather service in Grand Junction used a phrase for the stretch of river between the four corners and Mexican Hat that I don’t think I’ve seen them use before.
Catastrophic flooding.
A flood warning ran through Tuesday morning.
That’s the footage.
The river at Pagosa, still enormous on the 23rd after it had started to fall, which is the first thing a lot of people saw, posted by someone standing on a bridge, the Animas through Durango, Farmington, Shiprock, the roofs, and then, by the weekend, the lake.
Because the San Juan, after Mexican Hat, after the goosenecks where it loops back on itself through the rock, after the last of the canyon, runs into the upper end of Lake Powell.
And on the 22nd of October, Lake Powell took in 104,000 acre feet of water in a single day.
I need to give you that number properly.
An acre-foot is enough water to cover an acre a foot deep, about 326,000 gallons.
104,000 of them is roughly what the lake would get in a decent week of spring snowmelt.
It came in a day.
The day before, 56,000.
The day after, 81,000.
Against that, Glen Canyon Dam was letting out about 13,000 a day, steady, the way it had all month.
So, for 3 days, the lake was taking in six, eight times what it was releasing, and the surface started to climb.
5 ft in a week by the 23rd, 7 ft in 2 weeks by the 24th.
By that Saturday, the lake was at 3,526 ft, 9 and 1/2 ft above the record low of the 15th of September.
And the chairman of Utah’s Colorado River Authority said he expected 10 ft by Sunday’s reading.
10 ft of water on a lake with 2,000 mi of shoreline, somewhere around 600,000 acre-feet by the Tribune’s arithmetic, twice the capacity of one of Utah’s big mountain reservoirs in 2 weeks in October, when the lake is supposed to be quietly draining toward winter.
There’s a lag in that which I want you to feel because the footage collapses it.
The rain fell on the 21st and 22nd.
Pagosa peaked Thursday night, Farmington Friday morning, Shiprock early Saturday, Four Corners Saturday afternoon, Bluff Sunday.
And the Tribune, reporting on Sunday the 25th, said the floodwater from the lower San Juan was expected to reach the lake late Sunday night or early Monday.
So, the 104,000 acre-feet on the 22nd wasn’t even the San Juan flood proper.
That was the first rain and the creeks and the upper river arriving early.
The main body of the water, the part that went over the roofs at Shiprock, was still on its way when I started writing this, 4 days behind the rain, moving down 200 mi of canyon at walking pace.
The lake was going up before the flood had got there.
And the San Juan did it.
In a normal October, the San Juan provides about 13% of what flows into Lake Powell.
This October, it provided a third.
The Green River, the other big tributary, was giving a normal amount.
The main stem of the Colorado out of the headwaters was at 64% of typical.
One river out of three in flood carried the lake up 10 ft while the others did nothing special.
That’s the thing I’m looking at.
That’s what the title means.
Not a lake rising.
A single river 200 mi upstream with a gauge that stopped reporting and a town on its roofs lifting the second largest reservoir in America by itself.
And now the part that made me stop.
On the 22nd of October, the day Lake Powell took in 104,000 acre-feet, Lake Mead, 300 mi downstream, hit the lowest level it has ever reached, 1,037.
16 ft above sea level.
Lower than 2022, which had been the low everyone remembered with the barrels and the bodies coming out of the mud.
The same day, the same river, one reservoir rising faster than it ever had in October, the other at the bottom of its history.
How does that work? It works because the Colorado isn’t a bathtub.
It’s a staircase, and the water only goes down the stairs when somebody opens the gate.
Lake Powell sits behind Glen Canyon Dam.
Lake Mead sits behind Hoover Dam, 300 mi downstream with the Grand Canyon in between.
Water that falls on the San Juan Mountains runs into Powell.
It doesn’t get to Mead until the Bureau of Reclamation lets it out of Glen Canyon Dam, and the Bureau was letting out about 13,000 acre-feet a day, 6,600 cubic feet per second flat, all month, flood or no flood.
The dam doesn’t pass a flood.
It holds it.
So, every acre-foot the San Juan threw into Powell stayed in Powell, and Mead got what it was always going to get, which was a trickle set by a schedule written months ago.
And here’s the detail that explains the headline nobody could parse.
There’d been another storm 10 days earlier.
The remains of a different hurricane, Rachel, had come through around the 11th and 12th of October and dumped a record inch of rain on Las Vegas and rained hard over the lower basin.
But the lower basin is below Glen Canyon Dam.
Rain that falls on Las Vegas and the Nevada desert runs into Mead or into the ground or into the Grand Canyon side creeks and doesn’t touch Powell at all.
Rachel fell on the wrong side of the dam to help Powell and Trudy fell on the wrong side to help Mead.
Two hurricanes worth of rain on the same river system in two weeks.
Each one landing on one reservoir and not the other because of a wall of concrete between them that was built in 1963.
Mead rose half a foot in the two days after its record.
The Tribune put its two-week rise at 600ths of a foot.
Powell rose 10.
I want to give you one more picture of the dam because the staircase only makes sense if you can see the step.
Glen Canyon Dam is 710 ft of concrete across a sandstone gorge and the water leaves it through eight penstocks.
Big pipes that run through the dam to the turbines in the powerhouse at its foot and the mouths of those pipes sit at a fixed height in the lake.
When the surface is above them, water flows through and makes electricity.
When it drops below, it can’t.
There are also four bypass tubes lower down that can pass water without power and a pair of spillways high up that only matter when the lake is nearly full, which it hasn’t been since 1983 when they nearly tore themselves apart.
The releases are set by the Bureau to a schedule by the water year in millions of acre-feet and the schedule for this year had already been cut in advance from 7.
48 million to 6 million because the Bureau could see the lake was going to get close to the pipes.
The flood didn’t change the schedule.
The gate stayed where it was.
The water piled up behind it.
Let me give you the bigger picture now because it’s the one the footage can’t show and it’s the one that matters.
The water year, the hydrologist’s calendar, runs from October to September.
The one that ended on the 30th of September 2026 was one of the worst in the history of the Colorado.
The unregulated inflow to Lake Powell, the water that would have reached it with no dams upstream, was 3.
7 million acre-feet, 39% of normal.
The spring runoff, April through July, which is the season the whole system depends on, was 1.
1 million acre-feet, 18% of normal.
And August, the month before the record low, delivered a thousand acre-feet, 1,000, rounded in the Bureau’s own tables to 0%.
That’s the year the flood arrived into.
A year where the snow didn’t come and what came melted early and the summer gave the lake nothing at all.
And by mid-September, the surface was 27 feet above the level where Glen Canyon Dam stops being able to make electricity, 3,490 feet.
Below that, the turbines are dry and the only way water leaves the lake is through four bypass tubes.
And the five million people who get power from that dam get it from somewhere else, at a price.
And here’s where the flood sits in that, 10 feet, 600,000 acre-feet.
On the 23rd of October, after the rise, Lake Powell held five and a half million acre-feet, which is 24% of its capacity.
Lake Mead held 6.
8 million, 26%.
Together, 12.
3 million.
In October 2000, before the drought began, the two lakes held 43.
3 million.
In October 2022, the year of the barrels, 13.
2.
So, the two biggest reservoirs in the country, after the biggest October flood in the record, are holding less water than they held at the bottom of 2022 and a little more than a quarter of what they held when I was in school.
The chairman of Utah’s river authority said it the way he’d want it said, “The 10 feet will make a big difference.
It doesn’t solve the problem by any stretch of the imagination.
The man who runs the River Forecast Center for the whole basin said the rise was a drop in the bucket.
And then, because he’s a decent person, that it was a nice start to the water year, which is welcome.
A drop in the bucket.
10 ft of lake.
104,000 acre-feet in a day.
Towns on their roofs.
That’s what a drop looks like on this river.
Now, let me lay it out.
A reservoir at its lowest level ever on the 15th of September after a year with 39% of normal inflow and in August with none.
A hurricane’s remains that stalled over the San Juan Mountains on the 21st of October and dropped 4 in of rain on dry rock.
Every river out of those mountains setting or nearing a record on the same two days on both sides of the divide.
12 Colorado counties in emergency.
A bridge gone.
Houses gone.
Nobody dead.
Farmington at its highest stage ever.
Thousands of homes in New Mexico.
Sewage in the river.
A baby airlifted from Chaco.
Shiprock at 22 ft and the gauge going silent.
23 by the president’s count.
Roofs.
The Four Corners gauge at nearly four times its record.
Bluff, Montezuma Creek, Aneth evacuated.
Catastrophic flooding between Four Corners and Mexican Hat.
104,000 acre-feet into Lake Powell in a day.
10 ft in 2 weeks.
One river doing a third of the work.
And Lake Mead, the same day, at the lowest level in its history because the water that would have saved it is behind a dam.
And the rain that fell on its side of the dam was from a different storm.
12.
3 million acre-feet in the two lakes together.
A drop in the bucket.
That’s the whole thing.
And there’s no conspiracy in it and no one hid anything.
And every number I’ve given you is in a government table or a newspaper from the last 10 days.
What there is is something I find harder to look at than a cover-up, and I’ll get to it.
Once you see the river as a staircase, you can’t unsee it.
Every piece of footage from the last 2 weeks, the river at Pagosa, the lake coming up over the sand at Lone Rock, the ring on the canyon wall getting shorter, the Mead shoreline not moving, is a picture of one step.
The storm picked a step.
The dam held the water on that step.
The lake below got nothing.
And the news reported each step as if it were the whole river, so that on the same weekend you could read that the Colorado was flooding and that the Colorado was at a record low, and both were true and neither was the story.
The story is the bucket.
And the lake footage itself deserves a word because I’ve watched a lot of it this week.
Lone Rock Beach, where a truck came out of the water a year ago, with the water coming back across the sand toward the cars.
The ramp at Bullfrog, with the lake lapping at concrete been high and dry.
Drone shots of the bathtub ring with a new dark band at the bottom of the white where the water has climbed back up the rock.
10 ft of wet sandstone under 170 of pale.
And the color.
The lake at the San Juan arm isn’t blue this week.
It’s brown.
The flood came in carrying the San Juan mountains with it.
Silt and sand and the topsoil of 12 counties.
And the upper end of the reservoir is the color of the river and will be for weeks until it settles out onto the bottom and becomes another inch of the mud that’s been filling the lake since 1963.
The water that lifted Powell is also burying it.
That’s not a metaphor, either.
Reservoirs fill with sediment.
Floods are how So, here’s the official position, and I agree with it.
And this time I’ll tell you where I think it’s quietly terrifying.
The official position is that a stalled tropical system produced extreme record-setting runoff in the San Juan Basin in late October 2026, causing severe flooding in Colorado, New Mexico, and the Navajo Nation, and delivering several hundred thousand acre-feet to Lake Powell over about 2 weeks.
The inflow raised Powell roughly 10 ft from its September record low, but left it near a quarter of capacity, with the system’s combined storage at historic lows.
Lake Mead, downstream of Glen Canyon Dam, was unaffected by the inflow and reached a record low on the 22nd of October.
Releases from Glen Canyon Dam were held at 6,600 cubic feet per second, and the annual release for the water year had already been cut from 7.
48 to 6 million acre-feet to protect the dam’s power pool.
The Interior Secretary announced the operating decision for 2027 and 2028 the same week, describing a river that supports 40 million people.
The flood does not change the long-term outlook, which depends on the coming winter’s snowpack.
I believe every word.
And the quietly terrifying part is in the last sentence.
The whole system is waiting for snow.
It’s always been waiting for snow.
And last winter, the snow didn’t come, and the spring gave 18%, and the summer gave nothing.
And the thing that finally put water in the lake was a hurricane that drowned a town.
If that’s the shape of the new river, big dry years and then a tropical storm that lands on one tributary and floods it to four times its record, then the reservoirs weren’t built for it.
They were built for snow.
Powell was designed to catch a slow spring melt and hold it through a dry summer.
It wasn’t designed to catch Shiprock.
And there’s a silence here, and it’s not about what anyone’s hiding.
It’s that the flood had an aftermath in two places, and only one of them is in the footage.
The lake is in the footage.
The lake going up over the sand, the boats floating off the mud, the ramps coming back into service, the ring shrinking.
That’s the aftermath people shared, and it looks like good news, and in a narrow way, it is.
The other aftermath is in Shiprock and Bloomfield and Bluff and Aneth and the Southern Ute Reservation and a dozen Colorado counties.
It’s thousands of homes with the San Juan in them.
It’s a sewage plant that went under and put what it held into the river that then went into the lake.
It’s a bridge on a federal highway that isn’t there.
It’s a Navajo Nation emergency declaration so that chapters can spend their reserves on shelter and water.
It’s a governor preparing a federal disaster request on top of another one she’d filed the day before for a different flood from September that had done $27 million of public damage across 14 counties and three tribal nations.
Two floods a month apart in the same state and the lake footage is from the second one.
And the lake footage is the part that looks like a gift.
The aftermath no one was ready for isn’t the water in the lake.
It’s that the water in the lake came out of people’s houses.
That the 600,000 acre-feet that lifted Powell 10 ft ran through Farmington first and through Shiprock and over the roofs and that the Navajo communities along the lower San Juan who have the least say over the river and get the least from it were the last stop before the reservoir.
The lake is up.
The town is under.
It’s the same water.
So, the questions.
The ones I’m actually left with as I record this with the flood warning still in effect.
What did the Shiprock gauge miss? It stopped at 22 ft.
The president said 23.
What was the real crest and will the provisional numbers from Four Corners survive the survey? Where does the sewage go? Bloomfield’s plant went under on Friday.
The river reached the lake on Monday.
What arrived with it? How much of the 10 ft stays? Powell is releasing 13,000 acre-feet a day every day by schedule.
At that rate, how long before the flood’s gift has gone through the turbines and down to Mead and the ring is back where it was.
What was the September flood? The governor of New Mexico filed for a federal disaster declaration on Friday for flooding between the 20th of September and the 2nd of October across 14 counties and three tribal nations.
$27 million of damage, and I’d never heard of it.
It happened a month before Trudy, and it didn’t reach the lake, so it didn’t make the footage.
How many of those are there? What’s a record worth on a 40-year gauge? The Four Corners station dates to 1985.
Nearly four times its record sounds like the end of the world.
On a river that’s been running for 10 million years, it’s the end of a short window.
What did the San Juan do in 1911 before the gauges? What did it do in the 13th century when the people who built the cliff dwellings left? Is this the new river? A failed snow year, then a hurricane.
Powell up 10 ft on one tributary, Mead at the bottom.
If the Colorado is going to be fed by tropical storms landing on one mountain range at a time, which reservoir is in the right place and which isn’t? And the one I keep ending on.
Who’s going to be ready next time? The lake has its managers and its schedules and its operating decisions for 2027 and 2028 announced by the Secretary of the Interior in a press release.
Shiprock has a gauge that stopped at 22 ft.
And one last number because it’s the one that’ll decide whether any of this mattered.
The water year that started on the 1st of October 2026 has, as of this week, a San Juan that gave 152% of its normal October and a Colorado headwaters at 64% and a lake 10 ft up from the bottom.
Everything else is snow that hasn’t fallen yet.
The forecasters are looking at the Pacific where the hurricanes came from and at the ridge that’s kept the storms south of the mountains for most of the last decade and saying what they always say in October, which is that they don’t know.
If the winter comes, the 10 ft is a start.
If it doesn’t, the 10 ft is what the lake has and the schedule takes it through the turbines by spring and the rain comes back down and Mead is where Mead is and the next thing that fills the lake is the next hurricane that happens to stall on the right mountain.
I want to end at the gauge.
It’s just after midnight on Saturday the 24th.
The San Juan is coming through Shiprock in the dark, brown and loud and wider than anyone there has seen it, carrying fence posts and propane tanks and the roofs of sheds.
And up on the bank, in a pipe, a sensor is doing what it’s done every 15 minutes for decades.
Measuring, sending.
21 ft.
21 and a half.
Nearly 22.
The highest number it has ever sent.
And then the river reaches it or the power goes or the bank it’s on goes and it sends nothing.
And the water goes on past it without being counted.
Past the town, past the four corners where another gauge catches it at 54,000 and holds on.
Past Bluff and the Goosenecks, into the lake where a different kind of gauge, the one on the dam, watches the surface climb a foot a day and sends that number to a different server and a reporter picks it up and writes, “Lake Powell is rising”.
Both numbers are true.
Both are the same water.
And one of them is in every headline this week and the other one stopped at 22 ft in the dark with people on their roofs.
And I think the river knows which one we were watching.
If you were in the Four Corners this week, in Pagosa or Durango or Farmington or Shiprock or Bluff, I want to hear what you saw and whether you’re all right in the comments before anything else.
And if you were at the lake and watched it come up, >> >> tell me that, too, because it’s the same story and I’d like it told from both ends.
That’s where the next one of these usually comes from.
I have a feeling this isn’t the last time we go down.
I’ll see you in the next one.
