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Upcoming Events
- Bitterroot River Cleanup
September 11, 2010 (10:00 )
- Crown of the Continent Conference
September 23, 2010 (8:00 )
- Realtors Riparian Training
September 24, 2010 (All Day)
Water Watch Milltown Dam
| Milltown Dam Removal and Cleanup Project |
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History The western end point of the upper Clark Fork’s Superfund complex is the Milltown Dam area. For one hundred years, the dam plugged the river just eight miles upstream of Missoula at the confluence of the Clark Fork and Blackfoot rivers. The 180-acre reservoir behind Milltown Dam has been full of contaminated sediment—6.6 million cubic yards of it—that washed down from Butte’s copper mines during the record flood of 1908 and stacked up behind the dam. The contaminated sediment, laden with arsenic, poisoned local wells and copper for years and also killed off fish and other aquatic life during high flows and ice jams. On Aug. 2, 2005—after 22 strenuous years of investigating the site, developing a cleanup plan, and negotiating who pays for what—officials from four federal and state agencies, the Confederated Salish and Kootenai Tribes, ARCO, and Northwest Energy signed an agreement to remove Milltown Dam and the most contaminanted sediments piled up behind it. The dam is slated to come out of the river one half at a time between spring 2008 and spring 2009, and sediment excavation—a two-year project—will last until 2010. Restoration efforts will follow at the free-flowing confluence of the Clark Fork and Blackfoot rivers. The Milltown Dam removal is a huge victory for rivers and communities upstream and down. We have worked persistently since 2000 to transform dam removal and sediment cleanup into a thinkable, viable option that was eventually endorsed by the EPA, the State of Montana, U.S. Sen. Max Baucus, state legislators, local governments, and thousands of citizens and businesses in the communities near the Milltown Reservoir.
For the area’s groundwater, the most worrisome of Milltown’s toxins is arsenic. It has already poisoned local drinking water supplies and an arsenic plume stretches well beyond the reservoir's boundaries. As for surface waters, the natural cycles of runoff, flooding, and ice scourings mean that copper and zinc from the reservoir are routinely churned up and washed over Milltown Dam and into the Clark Fork where they degrade water quality and pose unacceptable risks to river life. End Fish Kills: Trout populations in the Clark Fork are not what they should be and it's no mystery why: metals and dams. On the metals front, copper is the big problem—it is extremely toxic to fish and other aquatic life. Over 13,000 tons of it sits in the reservoir, sending toxic pulses over the dam during high flows and ice jams. Then there's the dam. Milltown is one of four on the Clark Fork and has the distinction of blocking fish from travelling to the upper river to reach key spawning tributaries, such as the Blackfoot, Rock Creek, and Flint Creek. To make matters worse, migrating trout—such as the threatened bull trout and westslope cutthroat trout—stack up at Milltown dam during spring runoff. That’s the same time that high flow flushes the metal-laden sediment over the dam and down the river. For native fish on the upstream side of the dam, conditions can be just as inhospitable. Northern pike have all but taken over Milltown Reservoir. These introduced fish are aggressive, they eat trout that are trying to migrate downstream, and they thrive in slow, warm water. Improve Local Economics: Milltown Dam generated under 2 megawatts of power—a negligible amount of energy for a hydroelectric dam. In fact, that kind of output doesn't even cover the dam’s two-person payroll. From a business perspective, the dam was a losing venture. As for nearby communities, the dam and its contaminated reservoir are a drag on local economies. The “Superfund” stigma does not attract investment dollars or tourism activity to the region. And a dam blocking the confluence of two mighty rivers drastically curtails the ecological potential of the area, which in turn hobbles its economic vitality. Expectations Fish of all species will immediately be able to migrate unhindered past the former dam site, and their populations for many miles upstream and downstream will likely increase. The arsenic contamination in groundwater will dissipate within a decade, perhaps as quickly as four years, according to models. The risk of downstream releases of metals will be permanently eliminated, and there will be no risk of dam failure that would send millions of tons of contaminated sediment downstream.
The return of the confluence of the Clark Fork and Blackfoot rivers to a free-flowing state will revitalize the area’s economy and create a significant community asset, providing fishing, boating, and other types of river recreation that are in high demand in western Montana. This moment can also be one of supreme satisfaction, gratitude, and pride for all friends of the Clark Fork River. The notion of dam removal was “far-fetched and ridiculous” only five years ago. Today, it's “desirable, even necessary." Thousands of you wrote letters, contacted your elected officials, spoke up at public meetings, donated your time and money, and educated your children, your friends, your neighbors, and your clients on behalf of a clean and dam-free river at Milltown. Your hard work made the difference.
Bringing down the dam, 3 Aug. 2005.
Milltown consent decree (Department of Justice) |
Remove Water Pollution: The Milltown Reservoir contains mining waste that began stacking up against Milltown Dam almost immediately after it was built in 1908. That year, 33 days of rain fell on western Montana, washing millions of tons of mining waste into the floodwaters that poured down the Clark Fork. Today, the reservoir is so full that the dam can’t hold back the metals-laced sediments that wash downstream during high runoff events.