04/16/2026
Historic satellite imagery shows one of the biggest restoration victories in our watershed's history: the removal of the Milltown Dam and subsequent transformation of the site into a State Park.
This superfund-site turned beloved recreation area is the result of decades of tireless advocacy spearheaded by . For over a century, the confluence of the Clark Fork and Blackfoot Rivers was dammed and the surrounding land submerged in highly contaminated water - the consequence of upstream copper mining.
More than 6.6 Million cubic yards of mining waste - much of it carcinogenic arsenic and other toxic heavy metals - had been trapped behind the dam, poisoning the waterway and local residents for years. And the dam wasn't just creating a Superfund site; it was blocking a critical migration corridor for native bull trout and other species.
Remediation and cleanup efforts began in 2006, and since the dam's full removal in 2008, efforts have been underway to restore the river's natural channels, vegetation, and floodplain.
1995: The Milltown Dam backs up contaminated water more than a mile up the Clark Fork and Blackfoot rivers.
2006: Last satellite image of the Milltown Reservoir before drawdown begins in preparation for restoration and dam removal.
2009: The dam is removed. Water from the Clark Fork River is artificially side-channeled and straightened to allow for removal of toxic heavy metals elsewhere in the path of the river.
2013: The Clark Fork begins to regain its natural channeling. Revegetation of the drained reservoir is in its beginning stages.
2025: Present day. The Clark Fork meanders naturally and vegetation has begun to thrive in the floodplain along the river. Milltown State Park is now one of the area's most popular sites for recreation.