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Granite County keeps Georgetown Lake outflow steady while monitoring full pool
Summary
County commissioners unanimously approved a temporary outflow strategy for Georgetown Lake — matching outflow to inflow for one week while lake remains at or near full pool — after USGS gauge readings and input from hydrodynamics and FWP staff.
Granite County commissioners on June 30 directed staff to maintain current operations at a higher outflow setting, with a plan to match outflow to inflow for one week while Georgetown Lake remains at or near full pool.
USGS gauge data and the dam tender reported the lake at 6,429.73 feet, approximately 2.76 inches above full pool. Paul Tallon of Flint Creek Hydrodynamics and representatives from Montana Fish, Wildlife & Parks (including Brad Leirmann and Alex Scolavino) joined the meeting to discuss inflow and outflow coordination. Commissioner Adler moved to “stay at what they are doing at 60, matching back to 30 CFS, matching outflow with inflow for a week, as long as it's at full pool.” Commissioner McLure seconded the motion, which passed unanimously.
County and state staff said the temporary approach was intended to balance lake-level management with downstream flow needs while avoiding abrupt changes. No formal changes to long-term operating rules were adopted; commissioners asked staff to continue monitoring and to report back if conditions change.
The decision was a short-term operational directive, not a regulatory change, and commissioners asked technical staff to coordinate with the Forest Service and Montana FWP as conditions evolve.
