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Great Salt Lake advisory committee advances salinity methodology, defers formal approval pending USGS review
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Summary
At an Oct. 7 meeting the Utah Great Salt Lake advisory committee reviewed new salinity metrics and a draft management plan, discussed recent legislation affecting berm operations, and heard that a feasibility report would be posted; final methodology approval will wait for USGS and bureau‑level clearance.
SALT LAKE CITY — The Utah Great Salt Lake advisory committee met Oct. 7 to review new methods for measuring and reporting salinity and to discuss a draft Salinity Management Plan that officials say will guide future operational decisions about the Causeway berm and other tools to manage salt mass.
Christine Ramsey, a private citizen and University of Utah student who presented the committee’s measurement updates, said recent samples collected Oct. 7 show shallow salinities around 126 grams per liter in parts of the South Arm and that the committee’s most recent salt‑mass estimate is roughly 868,000,000 tons. “We’re sitting at about 126 grams per liter,” Ramsey said, and added that the lake currently shows little stratification across depth at sampled sites.
The committee spent much of the meeting discussing a methodology document that would standardize three metrics: the upper‑brine‑layer volume‑weighted salinity, the full‑depth volume‑weighted salinity, and full‑depth dissolved salt mass. Ramsey and others said the standardized values would allow agencies, industry and the public to compare like with like and to use an isomass plotting approach to anticipate how lake elevation changes would affect salinity.
Paul, a division presenter, told the committee the division expects to post a final feasibility report on the Great Salt Lake to the agency website and to provide as much unredacted material as practicable so stakeholders can review the analysis. He also summarized language adopted in a recent special session that, he said, changes effective‑date language and gives managers somewhat broader discretion to consider ecological and public‑health implications when operating berms. “That bill gives us a little bit more flexibility to consider other objectives in managing the berm,” Paul said.
Committee members debated how the new computed metric should appear on public platforms. Some members favored replacing or supplementing the HydroMapper’s current raw point measurements with the volume‑weighted upper‑brine calculation; others urged keeping the legacy display alongside any new calculated series to avoid confusing users and suggested a clear explanatory banner or hover text on the web tool.
On science and biological implications, researchers described three decades of work showing that brine shrimp cyst buoyancy and hatchability vary by year, sample depth and salinity. One presenter summarized experimental results showing diminished hatch rates at high salinity (for example, lower hatching after 72 hours at ~130 ppt), and cautioned that freshwater lenses and intra‑year variability mean lenses are a helpful consideration but not a guaranteed management lever.
Timing and next steps were a key focus. Division staff said legal review and a pending lawsuit had slowed elements of the draft plan but that they expect a draft from contractors in early 2026, followed by a formal public review period in spring. Ramsey asked the committee to review the final methodology after USGS peer review and bureau clearance before the committee takes a formal approval recommendation; the committee agreed that final approval should wait for the completed, bureau‑level document.
Other items: the division announced a round of 15 grants with applications due Dec. 1 to support monitoring and related projects; staff said contracts are being timed to let awardees hire and plan before July 1. The committee validated routine monitoring priorities (noting sites at LVG4, RD2, Saltair and the causeway corridor) and discussed sampling cadence and display conventions for historical versus newly computed metrics.
Procedural actions at the meeting included the unanimous approval of the previous meeting’s summary and the unanimous motion to adjourn. Committee members set quarterly checkpoints (January, June, August, October) for ongoing assessment and noted they may convene sooner if runoff or snowpack conditions warrant.
The advisory committee did not adopt the methodology at this meeting; members agreed to review the final USGS‑vetted methodology and the full draft Salinity Management Plan before issuing a formal committee endorsement.
