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NorthWestern Energy working to restore Hebgen Dam gate functionality and full river flows to the Madison River

Date: Dec 1, 2021

TYPE: News

Butte, Mont. – Dec. 1, 2021 – Water flow from Hebgen Dam to the Madison River significantly decreased Nov. 30 when a gate component failed on the dam’s outlet structure, decreasing the opening for the outtake of water at the bottom of the gate.

There are no issues or risks to the intake or dam structure, but the gate malfunction interferes with NorthWestern Energy’s ability to control river flows.

NorthWestern Energy hydro engineers and personnel have been working around the clock to develop a repair plan, and are on-site this morning to restore gate functionality and river flows to the Madison River as quickly as possible, safely.

Water was released over the dam’s spillway yesterday, which added some flow to the outlet gate releases to provide a small increase to the river flow.  

Equipment and crews will be at the site until the issue is resolved. The public should avoid the Hebgen Dam area.

Safety and restoring full water flow to the Madison River as quickly as possible for the fishery is NorthWestern Energy’s priority.

NorthWestern Energy will provide updates as more information is available.

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About NorthWestern Energy (Nasdaq: NWE)

About NorthWestern Energy (Nasdaq: NWE)

NorthWestern Corporation, doing business as NorthWestern Energy, provides essential energy infrastructure and valuable services that enrich lives and empower communities while serving as long-term partners to our customers and communities. We are working to deliver safe, reliable, and innovative energy solutions that create value for customers, communities, employees, and investors. This includes bridging our history as a regulated utility safely providing low-cost and reliable service with our future as a globally-aware company offering a broader array of services performed by highly-adaptable and skilled employees. We provide electricity and / or natural gas to approximately 743,000 customers in Montana, South Dakota, Nebraska and Yellowstone National Park. We have provided service in South Dakota and Nebraska since 1923 and in Montana since 2002. More information is available on the company's Web site at


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