Engineers propose adaptable gate structure at causeway to manage salt flux; preliminary estimate ~$40M

Summary

Jacobs and state engineers presented a gated flow-control concept at the causeway to allow seasonal control of north↔south flux and reduce long-term salt export; the concept prioritizes flexibility and replaceable panels to limit corrosion and encrustation but carries high geotechnical and pile-driven cost uncertainty.

Engineers presented a concept design for a flow-control structure at the railroad causeway intended to give the state a flexible means of managing net salt flux between the Great Salt Lake's North and South arms.

Concept and design drivers: Jacobs and state staff said the existing berm works well to limit north→south flow in low lake conditions but cannot import North Arm water to the South Arm if future conditions require added salt mass in the South Arm. The proposed solution is a single concrete (or sheet-pile) wall with five gated bays (each ~16 feet wide) that combine a lower orifice-type opening to encourage salt-laden bottom flow and an adjustable upper weir to limit south→north overflow. Engineers emphasized two main physical controls: hydraulic head differential (elevation differences between arms)…

Engineers propose adaptable gate structure at causeway to manage salt flux; preliminary estimate ~$40M

Summary

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