GSL Fact vs. Fiction: What They Say vs. What the Data Says

A lot gets said about the Great Salt Lake — in press releases, on the campaign trail, in Facebook comments. This is the first entry in an ongoing series holding those claims up against the state's own numbers, one claim at a time. First up: are water diversions actually slowing down, or is Utah drawing more than ever?

New here? This is a companion to Did You Know? The Great Salt Lake, From 1847 to Today and The Life of the Great Salt Lake. Those two cover the basics; this one is a running fact-check log, starting with the single most common claim about the lake's decline.

Claim #1: "They're not really stopping diversions — they're drawing more than ever."

The claim, as it's commonly made

"Despite all the talk about saving the Great Salt Lake, the state hasn't actually reduced how much water gets diverted before it reaches the lake — if anything, more is being taken out than ever before."

Mostly supported — with an important addition

What the data says: Total water depletion from the Great Salt Lake's watershed is up, not down — the Kem C. Gardner Policy Institute's Great Salt Lake Strike Team found total basin-wide water depletion in the early 2020s ran about 5% higher than in the early 1990s. So the core of the claim checks out: diversions have not been reduced overall.

But the "who" has shifted. Agriculture's share of that use actually fell, from about 71% in the 1990s to about 65% in the 2020s — while municipal and industrial use grew from about 24% to about 27% of the total, driven almost entirely by outdoor residential watering (97% of municipal water use in 2024 was outdoor, per the same report). Lawn and landscape watering alone now accounts for roughly 408,500 acre-feet a year — about a quarter of all agricultural water use in the basin, from a single category of municipal use.

The addition worth making: the state has also dramatically scaled up efforts to put water back into the lake in just the last few years — from about 18,000 acre-feet secured in 2021 to 163,468 acre-feet in the most recent year on record. That's a real, documented shift in effort. It just hasn't been enough yet to offset the growth in use elsewhere: the state's own target is at least 800,000 additional acre-feet a year to reach a minimum healthy elevation by 2034 — meaning current gains cover roughly a fifth of what's still needed.

The Timeline: 179 Years of Taking Water Out, a Few Years of Putting It Back

Diverting water from the rivers that feed the Great Salt Lake didn't start with data centers or lithium mines — it started with the first irrigation ditches in 1847. Click through the timeline to see how that history led to today's numbers.

Diversion & Restoration Timeline, 1847–2026

Click a point for detail · red = diversion/development, green = restoration effort, amber = data point or governance change

Click a point above Each point marks a documented milestone in the basin's water-diversion or restoration history.

Diversion / development Restoration effort Data point / governance

Who's Actually Using the Water

The clearest way to see the shift the data describes is side by side: the 1990s breakdown against the 2020s breakdown of where basin water depletions go.

Share of Basin Water Depletions, By Decade

Hover or tap a bar for sourcing

Figures from the Great Salt Lake Strike Team's 2026 Data and Insights Summary, comparing the first four years of each decade. Remaining share in both decades goes to mineral extraction, impounded wetlands, and reservoir evaporation.

Indoor municipal water use has stayed roughly flat even as the population has grown — the increase is almost entirely outdoor watering.
Per-resident water use has mostly declined since 1989 due to conservation, but total municipal use has still risen because there are simply more residents.
None of this erases agriculture's role — it's still the largest single water user in the basin by a wide margin. The finding is that it's no longer the whole story, and hasn't been for a while.

More Claims to Check

This series will grow as more claims come up. On deck, pending sourcing:

"The Bear River Development pipeline would only cost the lake a small amount of water." The one specific project figure in the academic literature (Wurtsbaugh et al., 2016) put a completed Bear River pipeline at an additional 8.5-inch elevation drop and roughly 30 more square miles of exposed lakebed — worth checking against the project's current status and any newer estimates before treating either number as final.
"Mineral extraction is a bigger water user than agriculture." Not supported by current data — mineral extractors account for roughly 7% of basin depletions combined, far behind agriculture's roughly two-thirds share (see the companion piece's mineral-extraction section for the named companies and figures).

GO DEEPER · FULL CASE FILE One Lake, Two Money Pots, and a Council That Calls Itself Private →

The governance side of this same story: the public council and the private trust council that review how the state's water-restoration money gets spent.

KEEP READING · COMPANION EXPLAINERS Did You Know? The Great Salt Lake, From 1847 to Today →

The lake's water-level history and the governance changes that followed the 2022 record low.

Sources & Notes

Wayne A. Wurtsbaugh, Craig Miller, Sarah E. Null, Peter Wilcock, Maura Hahnenberger, and Frank Howe, Impacts of Water Development on Great Salt Lake and the Wasatch Front, Utah State University Watershed Sciences Faculty Publications (2016) — digitalcommons.usu.edu. Source for the finding that consumptive water use reduced net river inflow to the lake by 39% over roughly 150 years, that the lake sits about 11 feet lower and has lost about 48% of its volume as a result, the sector breakdown (agriculture 63%/7.0 ft, mineral extraction 13%/1.4 ft, municipal and industrial 11%/1.3 ft, impounded wetlands 10%/1.1 ft, reservoir evaporation 3%/0.3 ft), and the projected Bear River Development pipeline impact (8.5-inch additional elevation drop, ~30 additional sq mi exposed).
Kem C. Gardner Policy Institute, Great Salt Lake Strike Team, Great Salt Lake Data and Insights Summary (Jan. 7, 2026, Version 1.0) — gardner.utah.edu (PDF). Source for the 1990s-vs-2020s sector breakdown (agriculture 71%→65%, municipal/industrial 24%→27%), the 5% overall increase in total basin depletion between those periods, the 408,500 acre-feet/year residential-lawn figure, and the water-leasing progress figures (18,000 acre-feet in 2021 vs. 163,468 acre-feet in the most recent year), and the 800,000-additional-acre-feet-per-year target for a healthy minimum elevation by 2034.
KSL.com, 5 lessons learned about the Great Salt Lake in 2025 outlined in new report — ksl.com. Cross-referenced for the same Strike Team figures and confirmation that the municipal/industrial share increase reflects a real usage shift (attributed to residential growth and outdoor watering), not a change in measurement methodology.
Great Salt Lake Collaborative / Salt Lake Tribune, Not just farms: New report shows where water from the shrinking Great Salt Lake is going — greatsaltlakenews.org. Cross-referenced for the same 2026 Strike Team figures.
Utah Division of Water Resources, Bear River (interstate streams page) — water.utah.gov. Source for the Bear River Compact's original signing (March 17, 1958, Utah/Wyoming/Idaho), its November 1997 amendment adding 74,500 acre-feet of storage capacity, the 1920 Dietrich Decree and 1922 Kimball Decree, and the 1991 Bear River Development Act.
U.S. Bureau of Reclamation, Weber Basin Project — usbr.gov. Source for the project's 1956–1969 construction period and its average annual delivery (166,000 acre-feet for irrigation, 50,000 acre-feet for municipal and industrial use).
Office of Gov. Spencer Cox, Proclamation 2022-01 (Nov. 3, 2022) — cited in this docket's own case files; source for the suspension of new water-right appropriations across most of the Great Salt Lake basin, still in effect as of this writing.