Water to flow over Lake Ralph Hall spillway for first time

February, 7, 2025

Lake Ralph Hall graphic showing the new coffer dam put in place across the North Sulphur River and the diversion of water from the North Sulphur River channel up over the future dam and spillway.

Construction crews began redirecting water from the North Sulphur River channel on October 28 and moving it for the first time through the Leon Hurse Dam spillway.

The process began in late October when workers started building a temporary coffer dam just south of the spillway, which is also still under construction.

The smaller dam will block the river’s natural flow, diverting the water northward through the intake channel to the spillway.

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