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Advisers outline salinity management framework; discuss berm, import options and costs
Summary
The council reviewed a draft management framework tying dissolved salt mass to lake elevation and salinity targets, discussed tactics — adjusting the berm, exporting or importing salt, pumping or diverting runoff — and flagged cost and timing constraints for heavy engineering options.
At the meeting of the Utah Great Salt Lake Advisory Council, facilitator Jeff Denbiker presented a draft salinity‑management framework that links dissolved salt mass, lake elevation and targeted salinity ranges to guide operational decisions on the causeway berm and other interventions.
Denbiker described a "targeting plot" that translates current salt mass and lake level into a band of target mass appropriate for different elevation scenarios, which managers can use to consider whether to export salt (e.g., by raising the berm or restricting import) or import salt (e.g., lowering the berm, pumping north‑arm water over the causeway, or channeling runoff sources into the South Arm). "The objective was to maintain a dissolved salt mass in the south arm that's commensurate to the lake water level and the water volume required for the target salinity range," he said.
Practical tradeoffs dominated the discussion. Committee members agreed that exporting salt to the North Arm is well tested (raising the berm yielded a measurable export in past seasons) but warned that importing salt — via a large control structure, pumping, or diverted runoff — is harder, more costly and may require long lead times. Participants discussed a range of potential sources for added salt: mechanical import through the causeway, redirecting natural runoff (Newfoundland Basin), flushing stored salts from evaporation basins, or coordinated operations with mineral operators. One participant estimated that bespoke engineered structures (penstocks, large culverts or tunnels) could be in the tens of millions of dollars and would only function when head differences are small.
The group noted current conditions provide flexibility: recent monitoring indicates the South Arm is within target salinity ranges for near‑term management but that managers should be prepared if forecasts shift. The committee highlighted the need to define monitoring priorities and secure sustained funding so sampling and gauge networks are not disrupted.
Next steps and timing: staff will incorporate committee feedback into a written draft management plan and circulate it for review over the coming months, with a goal to fold the framework into the comprehensive management plan by fall; the committee also asked to keep meeting frequency flexible and convene a smaller working group to define tactical triggers for berm adjustments.
Ending: The committee closed the session with agreement to refine the management plan language, further evaluate engineering options and cost, and reconvene a subcommittee to prepare recommendations ahead of a final fall review.
