---
title: great salt lake dust is the lakebed
canonical_url: https://ensurance.app/guide/great-salt-lake-dust-is-the-lakebed
markdown_url: https://ensurance.app/guide/great-salt-lake-dust-is-the-lakebed.md
subtitle: "when the water leaves, the bed becomes the air"
category: ecosystem-services
---

# great salt lake dust is the lakebed

*when the water leaves, the bed becomes the air*

Great Salt Lake dust is the lakebed. On a day when the wind comes off the west, that bed is what you breathe along the Wasatch Front.

If you live here, you know the afternoon. The mountains soften. A pale film settles on the car by evening. In the warmer months that film can be the floor of the lake, lifted after the water has pulled back. West of the city the flats open up, pale and level, and a hard wind carries that ground into town. The grit on the glass and the plain in front of you are the same material.

The University of Utah, reported by the Deseret News on 17 September 2026, puts more than 800 square miles of that floor in reach of the wind. About 70 square miles are already active dust hot spots. If surface crusts degrade or groundwater falls, that active area could expand to as much as 187 square miles.

## the bed, once the water leaves

A terminal lake has no river flowing out of it. The Bear, the Weber, and the Jordan end here. What they bring has to remain as water, or the floor is free to leave as dust. [What the Great Salt Lake actually is](/guide/what-the-great-salt-lake-actually-is?from=guide) is that stopping place. This page is the same place with the cover pulled back.

**Great Salt Lake dust** is sediment from the exposed lakebed. While water lies over the floor, the floor stays put. When the water retreats, the same ground is a dry plain: bound where a salt crust still holds, loose where the crust has broken. The hot spots are the loose places. The rest of the exposed bed is still held by that crust.

| figure | what it measures | where it comes from |
| --- | --- | --- |
| More than 800 square miles | Lakebed exposed to potential wind erosion | University of Utah, via the Deseret News, 17 September 2026 |
| About 70 square miles | Active dust hot spots | The same University of Utah figures |
| As much as 187 square miles | How far those hot spots could spread if crusts degrade or groundwater falls | The same University of Utah figures |

About 70 square miles are blowing now. As much as 187 is what follows if the crust fails or groundwater falls. A salt crust can look solid underfoot and still powder. That step could more than double the ground already in the wind. The University of Utah stated the step as a condition, tied to the crust and the groundwater, not to a calendar date.

As of 25 September 2026, KSL and the Great Salt Lake Collaborative put the South Arm at 4,189.7 feet and the North Arm at 4,189.6 feet: more than 8 feet below the state's minimum healthy level, and a little more than a foot above the 2022 record low. Those elevations and the area figures were published eight days apart. One is a water-level reading. The other is a map of what the wind can reach. If you live in Salt Lake City, Ogden, or a town between them, that map already includes your air.

## how far the floor travels

Most days the addition is small: fine particles, repeated whenever the bed is dry. Lena Harris, Eric C. Edwards, and Danae Hernandez-Cortes measured that addition in NBER Working Paper 35270, May 2026, [Dust in the Wind: The Health Costs of Great Salt Lake Desiccation](https://www.nber.org/papers/w35270). It is still a working paper, circulating for comment. KSL's Carter Williams reported it on 1 September 2026 through the Great Salt Lake Collaborative.

The paper finds the lake's added pollution in non-winter months, when the exposed floor can move. As KSL relayed the air result, fine particulate matter near the lake rises by about 0.8 to 0.9 micrograms per cubic meter for every 100 square kilometers of exposed bed, about 39 square miles. Effects showed up as far as 62 miles from the lake, and some places straight downwind see more. The Wasatch Front sits inside that reach. Those particles are small enough to travel deep into the lung. A fraction of a microgram sounds slight until a whole valley breathes it.

[Air quality is made upstream](/guide/air-quality-is-made-upstream?from=guide). For this dust, the upstream surface is the uncovered bed. The rivers' water is the cover. When that cover is missing, the source sits to your west and the wind makes the delivery.

The authors used more than one way to pick out the lake's share of the air, and more than one instrument to measure it. The addition still showed. The health result is a range because the size moves with the method.

## the health receipt

Scaled to the exposed bed, the working paper estimates annual desiccation-related health costs of about **$1.1 billion to $2.3 billion**. At the margin, the same paper estimates about **$81 million to $175 million per 100 square kilometers** of exposed lakebed. KSL described those marginal dollars as emergency-room visits and years of life. Harris called the paper a first step toward showing policymakers the health costs of Great Salt Lake dust.

| receipt | range | label |
| --- | --- | --- |
| Annual health costs tied to desiccation | $1.1 billion to $2.3 billion | NBER Working Paper 35270, May 2026, still a working paper |
| Marginal annual cost | $81 million to $175 million per 100 km² of exposed bed | The same working paper, covered by KSL on 1 September 2026 |

Ben Abbott, an ecologist at Brigham Young University and executive director of Grow the Flow, told KSL, "I view these numbers as rough, but a really important first step." Without an estimate like that, he said, people assume the cost is zero.

That range is a health receipt for desiccation: care, and years, in the authors' accounting. The lake remains the living system — brine, mats, birds on the Pacific Flyway, the shore the three rivers reach. The receipt is a bridge into a budget. It is not the worth of the lake.

If you staff a clinic or a county health department on the Wasatch Front, you already meet this wind. If you insure health or property in the same airshed, read the working paper as an exposure sketch still open to revision. The paper names no premium and puts no price on an acre of the lake. More uncovered bed means more of this bill.

If you insure health or property in this airshed, the door is [insurers](/solutions/insurers?from=guide&topic=great-salt-lake). The unit is still the uncovered bed, not a premium we invented.

## the people already on the dust

On 17 September 2026, Great Salt Lake Commissioner Hannah Freeze named the measurement still missing. She told the Deseret News: "We just want better information on where the dust is coming from, what's in the dust, and then people can make accurate decisions about that."

The University of Utah has drawn where the bed is loose. Freeze is asking which of those places are traveling, and what rides in the grains. Senate Majority Whip Chris Wilson said that day that the lake's health affects Utah's air quality. The person wiping the film off a windshield and the commissioner share one airshed.

Dust management is one of five focuses Freeze named for federal money, if that money comes: water infrastructure, agricultural optimization, municipal conservation, habitat and wildlife, and dust management. Rep. Celeste Maloy secured $10 million in June for a Great Salt Lake Watershed Recovery Program. She has said she doubts a proposed $1 billion arrives in a single year. The ten million is secured. The billion is a proposal. What can move now is water back on the floor, and a sharper account of the dust already in the air.

The Commissioner's Office already holds this question. Abbott and Grow the Flow have already treated a cost of zero as the wrong assumption. The gap that remains is water on the bed, and a clearer account of which dust is moving.

:::johnson
**the bed stays a bed only while the water stays.**

Great Salt Lake dust is the lake, uncovered. The health range is a receipt for that uncovering. Covering the floor again is a water decision a city can share with the state.

[see municipal watershed protection →](/solutions/governments?from=guide&topic=great-salt-lake)
:::

## water is the cover

The ecological fix is water back on the bed. Crust and groundwater can hold the flat for a while. As much as 187 square miles is what the University of Utah says can follow if those holds fail. Water on the floor is what keeps a hot spot from spreading across the rest of the exposed bed. The working paper ties that exposed bed to water use in the basin. The cover is the water itself.

The Great Salt Lake, its brine shrimp, and its microbialites exist whether or not anyone buys a certificate. *Ensurance* funds that covered condition. It is not the lake.

If you hold a city, county, or state brief on this air, the matching work is **municipal watershed protection**: keep more of the basin's water in the lake so the floor stays underwater. That is the governments door for this place. The Commissioner's Office stays in the lead. A second layer of funding can sit beside that work.

The lake's account is live at [great-salt-lake.basin](/great-salt-lake.basin?from=guide). A line called brine hold is in ideation under that account. [Co-create it](/specific/create?mode=suggest&agent=great-salt-lake.basin&name=brine%20hold&from=guide). A person reviews it. The parent agent receives it.

[talk to someone who can help with the lake →](/contact?from=guide&topic=great-salt-lake)

The west wind will come again. How much of the bed is still covered when it does is the decision in front of the people who already live with the film on the car.

## frequently asked questions

### what is great salt lake dust?

Great Salt Lake dust is the lakebed after the water leaves. Wind lifts sediment from the exposed floor and carries it onto the Wasatch Front. The dust is the lake, uncovered.

### how much of the great salt lake bed can blow?

The University of Utah, in figures the Deseret News published on 17 September 2026, counts more than 800 square miles of lakebed exposed to potential wind erosion. About 70 square miles are active dust hot spots. If surface crusts degrade or groundwater falls, that active area could expand to as much as 187 square miles.

### how much does great salt lake dust cost?

A May 2026 NBER working paper, number 35270, by Harris, Edwards, and Hernandez-Cortes, estimates annual desiccation-related health costs of about $1.1 billion to $2.3 billion. The marginal estimate is about $81 million to $175 million per 100 square kilometers of exposed bed. KSL reported the paper on 1 September 2026. Ben Abbott called the numbers rough and a first step. Read them as a health receipt in a working paper. They are not the worth of the lake.

### who is already working on the dust?

Great Salt Lake Commissioner Hannah Freeze has asked for better information on where the dust comes from and what is in it. Dust management is one of five focuses she named, beside water infrastructure, agricultural optimization, municipal conservation, and habitat and wildlife. Ten million dollars for a Great Salt Lake Watershed Recovery Program is secured. A proposed $1 billion is not in hand.

### what reduces great salt lake dust?

Water back on the bed. That is the ecological fix. A city can treat the work as municipal watershed protection, beside the Commissioner's Office.

## sources

[Deseret News, 17 September 2026](https://www.deseret.com/environment/2026/09/17/great-salt-lake-commissioner-to-use-trumps-1-billion/) — University of Utah exposed-bed figures, Hannah Freeze on where the dust comes from and what is in it, dust management among her five focuses, and the $10 million secured against a proposed $1 billion

[NBER Working Paper 35270, May 2026](https://www.nber.org/papers/w35270) — Lena Harris, Eric C. Edwards, and Danae Hernandez-Cortes, "Dust in the Wind: The Health Costs of Great Salt Lake Desiccation." Health-cost ranges. Still a working paper

[KSL / Great Salt Lake Collaborative, 1 September 2026](https://www.ksl.com/article/51618732/how-costly-is-great-salt-lakes-dust-a-working-paper-says-it-could-be-in-the-billions) — Carter Williams on the working paper, the fine-particle and distance results, and Ben Abbott's first step

[KSL / Great Salt Lake Collaborative, 25 September 2026](https://www.ksl.com/article/51627764/many-groups-are-trying-to-save-the-great-salt-lake-heres-how-they-can-better-collaborate) — Carter Williams, South Arm and North Arm elevations, and the comparison with the state's minimum healthy level and the 2022 record low

## the series

- [what the great salt lake actually is](/guide/what-the-great-salt-lake-actually-is?from=guide)
- [what brine shrimp need the lake to be](/guide/what-brine-shrimp-need-the-lake-to-be?from=guide)
- [a microbialite is not a water level](/guide/a-microbialite-is-not-a-water-level?from=guide)
- [great salt lake dust is the lakebed](/guide/great-salt-lake-dust-is-the-lakebed?from=guide)
- [the bear, the weber, and the jordan](/guide/the-bear-the-weber-and-the-jordan?from=guide)
- [who already sends water to the lake](/guide/who-already-sends-water-to-the-lake?from=guide)