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Public cautioned to stay out of Missouri River riverbed in area of Rainbow Dam during reservoir water drawdown

Date: Aug 30, 2021

Great Falls, Mont. –  Aug. 30, 2021- On Sept. 6 NorthWestern Energy will begin drawing water down in Rainbow Reservoir upstream from Rainbow Dam about 3.5 feet. The draw down will allow Montana Fish, Wildlife & Parks to conduct maintenance on effluent pipes at Giant Springs State Fish Hatchery on Sept. 7.

Rainbow Reservoir will begin to be refilled beginning the evening of Sept. 7 and will be back at full pool on Sept. 8.

Members of the public should not enter the riverbed. Deep mud, slippery rocks and the short duration of the water drawdown will create safety hazards.

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 About NorthWestern Energy (Nasdaq: NWE)

NorthWestern provides electricity and / or natural gas to approximately 743,000 customers in Montana, South Dakota, and Nebraska. We have generated and distributed electricity in South Dakota and distributed natural gas in South Dakota and Nebraska since 1923 and have generated and distributed electricity and distributed natural gas in Montana since 2002. More information on NorthWestern is available on the company’s website at

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