Moncton, WA Town Destroyed By Slow Flood, May-Dec 1915

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Moncton, Wash. -- Beginning in May 1915, the community of Moncton, located along the northern shore of Rattlesnake Lake, experiences one of the slowest floods in King County history. Throughout the summer, the lake is fed by seepage from an upstream dam, causing it to slowly rise. By the end of the year, Rattlesnake Lake had inundated the town, which is later condemned.
More than 200 people lived in Moncton, in 1915, and the fledgling community had a hotel, a barbership, a saloon, a restaurant, a few stores, and even an indoor swimming pool. A school on the north end of town provided education for children up through 8th grade. Older students had to walk or ride a horse seven miles to the nearest high school in North Bend.
In 1914, the City of Seattle began building a masonry dam on the Cedar River between Cedar Lake and Rattlesnake Lake. The dam was needed to impound water to generate electric power for City Light. By the spring of 1915, the masonry pool was filing up, which unfortunately caused seepage through the vast glacial moraine underneath.
Throughout the clear-cut hillsides that rainy season, nearby residents saw springs burst forth out of the ground, not a good sign. The moraine, filled like a sponge, was squirting out water wherever it could. As more water filled the pool, and more rain fell from the skies, more pressure caused more mini-geysers to erupt in the hills above Moncton. The excess water in the moraine had nowhere to flow but into Rattlesnake Lake.
Slowly the lake began to rise. First, the water edged up to the homes nearest the shoreline. A few days later, the streets muddied, and after that, standing water filled the lower section of town. At first, residents may have hoped that the slow-motion flood would somehow be diverted elsewhere, but it soon became apparent that their community would be underwater by summer's end.
During the month of May, the water rose a little over a foot per day. Rowboats and a barge were floated in so furnishings and personal items could be removed. After that the levels kept increasing to the point where houses popped off their foundations, causing them to float like corks into the middle of the lake.
Moncton residents kept a stiff upper lip and hoped for the best. Although many were now homeless, those who worked for the water department or the railroad were sheltered in tents while new homes were built for them.
Others were out of luck.
The school, located on higher ground, was still in use, but a storm ripped its roof off, and classes were moved to a church on the south end of the lake. By the time Rattlesnake Lake stopped rising, the buildings on the south end were the only ones spared.

From 1915-05 to 1915-12