— turquoise the glacier sends down.
“A reservoir on the upper Skagit, ringed by peaks, with water that turns turquoise in late summer. The colour is glacial flour from the Colonial, Neve, and Klawatti Glaciers on the ridges above, carried down in the streams that feed the lake. The roadside overlook on State Route 20 sits at the east end of the lake, about three thousand feet below the surrounding ridges of the North Cascades. Seattle City Light has held water here since Diablo Dam was finished in 1930. In low cloud the lake reads grey; on a clear August afternoon it is impossible to mistake for any other water.
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Diablo Lake sits in the upper Skagit River drainage in the North Cascades, on State Route 20 about thirty miles east of Marblemount in Whatcom County. The lake is a reservoir, formed by Diablo Dam at its lower end and fed by Ross Dam upstream; it covers about 910 acres at full pool, with a surface elevation of 1,201 feet. The standard roadside overlook is at the east end of the lake at approximately 1,850 feet, with a paved pull-off and an interpretive sign. The lake is part of the Skagit Hydroelectric Project, run by Seattle City Light, inside Ross Lake National Recreation Area within the North Cascades National Park Complex.
The turquoise colour comes from glacial flour, very fine particles of rock ground by ice and suspended in the meltwater. The particles in the water column scatter the shorter wavelengths of sunlight and absorb the longer ones, so the lake reads as turquoise to green-blue. The mechanism is the same one that colours Moraine Lake in Canada and Lake Pukaki in New Zealand. Above Diablo Lake, the Colonial, Neve, and Klawatti Glaciers on the ridges of the North Cascades grind bedrock into flour each summer and send it down through Thunder Creek and the Skagit River. The colour is most vivid from late July through September, when glacial melt is at its peak.
The Diablo Lake Overlook sits on State Route 20 at approximately milepost 132, about ninety miles east of Burlington and Interstate 5. The road is open from spring through late autumn; the gates near Ross Dam close for the winter, typically in November, and reopen in April or May. The pull-off has parking for about a dozen cars and an unobstructed view down the long axis of the lake. There is no entrance fee inside Ross Lake National Recreation Area. The colour is best on bright afternoons in August and September, and dullest on overcast mornings and after autumn rains have flushed the suspended flour down the Skagit.