As of 2010, Holter Dam had a 50 megawatt generating capacity.
The long-term median flow over and through Holter Dam as of 2005 was 7,610 cubic foot (215 m³) per second.
Flows into Holter Lake and over Holter Dam are generally considered to be controlled by flows from Canyon Ferry Dam.
The total annual discharge from Holter Dam between 1929 and 1988 was an average of 3,700,000 acre feet (4.6 km³) per year.

The wooden flashboards of Holter Dam were replaced in 1972.

Montana Power shut down electrical generation at Holter Dam in 1984 after a forest fire destroyed a 100,000-volt electric power transmission line.

In June 1999, Montana Power proposed lowering the level of Holter Lake by 16 feet (4.9 m) for six weeks so that the flashboards could be repaired and replaced.
Public criticism of the drawdown was extensive, but Montana Power insisted that it go ahead.
But in August 1999, Montana Power put its repair plans on hold.

On November 2, 1999, Montana Power announced it was selling all of its dams and other electric power generating plants to PPL, Inc. for $1.6 billion.
The sale was expected to generate $30 million in taxes for the state of Montana (although MPC said the total would be lower).
Subsequently, in May 2000 PPL announced it would use small steel cofferdams to drain the water around the flashboards and allow their repair without lowering the level of the lake.
The cost of using the cofferdams was $300,000.
Twenty-one of the dam's 31 flashboards were replaced.

In November 2001, citizens of Montana upset with energy price increases announced by PPL sought passage of a ballot initiative that would require the state of Montana to buy all of PPL's hydroelectric dams, including Holter Dam.
Montana voters rejected the initiative in November 2002.
Also in 2001, Holter Dam participated in an emergency management training exercise which, in part, planned for the catastrophic failure of Holter Dam.

The public used to be able to walk across the top of Holter Dam (which provided easy access to both sides of the river), but the dam was closed to the public after the September 11 attacks.
Holter Dam was one of the last two such PPL dams to be closed.
In 2014, PPL sold Holter Dam and their other Montana dams to NorthWestern Corporation.

While effective at generating electricity, well-designed, and well-engineered, Holter Dam is considered an exceptionally unpleasant structure visually.
In 1927, however, the Montana Legislature commissioned painter Ralph E. DeCamp to depict Holter Dam as one of four mural paintings to hang in the state's Law Library (located in the Montana State Capitol).
Japanese photographer Toshio Shibata has also photographed the dam, and exhibited this work in 1997 in Chicago at the Museum of Contemporary Art.
As of 2010, Holter Dam had a 50 megawatt generating capacity. The long-term median flow over and through Holter Dam as of 2005 was 7,610 cubic foot (215 m³) per second. Flows into Holter Lake and over Holter Dam are generally considered to be controlled by flows from Canyon Ferry Dam. The total annual discharge from Holter Dam between 1929 and 1988 was an average of 3,700,000 acre feet (4.6 km³) per year.
The wooden flashboards of Holter Dam were replaced in 1972.
Montana Power shut down electrical generation at Holter Dam in 1984 after a forest fire destroyed a 100,000-volt electric power transmission line.
In June 1999, Montana Power proposed lowering the level of Holter Lake by 16 feet (4.9 m) for six weeks so that the flashboards could be repaired and replaced. Public criticism of the drawdown was extensive, but Montana Power insisted that it go ahead. But in August 1999, Montana Power put its repair plans on hold.
On November 2, 1999, Montana Power announced it was selling all of its dams and other electric power generating plants to PPL, Inc. for $1.6 billion. The sale was expected to generate $30 million in taxes for the state of Montana (although MPC said the total would be lower). Subsequently, in May 2000 PPL announced it would use small steel cofferdams to drain the water around the flashboards and allow their repair without lowering the level of the lake. The cost of using the cofferdams was $300,000. Twenty-one of the dam's 31 flashboards were replaced.
In November 2001, citizens of Montana upset with energy price increases announced by PPL sought passage of a ballot initiative that would require the state of Montana to buy all of PPL's hydroelectric dams, including Holter Dam. Montana voters rejected the initiative in November 2002. Also in 2001, Holter Dam participated in an emergency management training exercise which, in part, planned for the catastrophic failure of Holter Dam.
The public used to be able to walk across the top of Holter Dam (which provided easy access to both sides of the river), but the dam was closed to the public after the September 11 attacks. Holter Dam was one of the last two such PPL dams to be closed. In 2014, PPL sold Holter Dam and their other Montana dams to NorthWestern Corporation.
While effective at generating electricity, well-designed, and well-engineered, Holter Dam is considered an exceptionally unpleasant structure visually. In 1927, however, the Montana Legislature commissioned painter Ralph E. DeCamp to depict Holter Dam as one of four mural paintings to hang in the state's Law Library (located in the Montana State Capitol). Japanese photographer Toshio Shibata has also photographed the dam, and exhibited this work in 1997 in Chicago at the Museum of Contemporary Art.
Holter Dam