Well before the CRSP's inception in 1956, the Bureau had begun to look for suitable reservoir sites along the upper Colorado and tributaries such as the Green, San Juan and Gunnison Rivers. One of the earlier proposals was called Echo Park Dam, at the confluence of the Green and Yampa Rivers within the Dinosaur National Monument in northwestern Colorado. The Sierra Club, led by David Brower, rallied against the proposal in the media and later in the courts. When the Bureau backed down from the Echo Park proposal, it was seen as one of the environmentalism movement's early victories – but it came with a compromise. A dam would still be built on the Green River, just upstream near a brilliant red-rock canyon called Flaming Gorge. A common misconception is that the building of the controversial Glen Canyon Dam was part of this "compromise for Echo Park", but in reality the Bureau had always planned to build a dam at Glen Canyon regardless of the outcome of the Echo Park debate.