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Bill

SB 61

Revise laws related to considerations for measuring of streamflow

2025 Regular Session Introduced by Butch Gillespie

Montana law updated streamflow measurement standards for water rights allocation, potentially affecting agricultural, municipal, and environmental water access decisions.

Chapter Number Assigned
#water
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Bill Summary · SB 61

Legislative bill overview

SB 61 revises Montana's legal framework for how streamflow measurements are considered in water rights and management decisions. The bill modifies existing statutes to update the methodologies, standards, or considerations used when measuring and evaluating water flow in streams. It became law on February 27, 2025.

Why is this important

Streamflow measurement directly affects water allocation for agriculture, municipalities, environmental protection, and hydroelectric power—critical issues in water-scarce western states. Changes to how streamflow is measured can shift water availability determinations, impacting farmers, cities, conservation efforts, and existing water rights holders. Montana's economy and ecosystems depend significantly on proper water management.

Potential points of contention

  • Agricultural vs. environmental interests: Farmers may benefit from certain measurement methods while environmental advocates worry about inadequate protections for fish and aquatic ecosystems
  • Water rights certainty: Existing water rights holders may face re-evaluation or reallocation if new measurement standards change historical flow assessments
  • Implementation costs: Updated measurement requirements could impose compliance costs on water districts, municipalities, and private entities managing water systems

Compiled from official sources — confirm details with the bill’s official record.

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