There’s a hole in Whiskeytown Lake, and why that is a good thing.

kennedy_at_whiskeytown_lake_1I guess to say a “There is a hole in Whiskeytown Lake” is a stretch. The correct term would be a drain, and not just any drain, one of the biggest drains in the world, right here in our “backyard”. Not to worry though, this drain was built to control the level of Whiskeytown lake when the reservoir gets too high, but viewing one of these drain in action gives the eerie feeling that there is a giant hole in the bottom of the lake.

Located about 6 miles West of Redding, Whiskeytown Lake, like many other man-made reservoirs that are scattered throughout our region here in Northern California, was one of the projects carried out by the United States Bureau of Reclamation. Construction was completed in 1963 and the reservoir began filling, and in September of that year, President John F. Kennedy came out to dedicate the reservoir in front of a crowd of more than 10,000. The goal of this reservoir, much like the other reservoirs constructed around this time, was to control flooding in the Northern California valley, as well as provide a constant supply of water for irrigation, and the generation of electricity.kennedy_at_whiskeytown_lake_2

Engineers at the United States Bureau of Reclamation had many design options when it came to the task of controlling these reservoirs from overflowing. Essentially they needed a drain, and a common design utilized was the inverted bell spillway. This design allows for the level of the lake to control itself, without the need of human oversight to run a gate or valve. Whiskeytown is not the only reservoir in Northern California to utilize this ominous looking inverted bell style drain for overflow protection, Trinity and Lake Almanor also make use of this style. But what makes it really interesting is Whiskeytown lake, along with another Northern-California man made lake, are in the top 5 of the largest drains in the world! Just a short drive south to Lake Berryessa outside of Napa, at the Monticello Dam, you can view the worlds biggest drain.
DV IMAGEThe Monticello Dam was constructed between 1953 and 1957, and impounded Putah Creek, creating what we know now as Lake Berryessa. The inverted spillway, or “morning glory” is considered to be the largest drain in the world, with an opening of 72 feet, and an outlet of 28 feet. When the reservoir is at capacity, the “morning glory” spillway can empty up to 362,000 gallons of water per second!monticello_spillway_birds_eye
Let us put that into perspective. 362,000 gallons per second equals almost 22 million gallons per minute. A typical shower head runs at about 2.5 gallons per minute, and a low flow version runs about 1.5 gallons per minute. But what does that look like? Well, at that rate, it would empty an Olympic size pool in under two seconds! For comparison, it would take the drain at Whiskeytown a little longer, clocking in at about 4 seconds.

These reservoirs, which provide us with much needed flood control, electricity generation, and water for irrigation, also give us a second added benefit: recreation. Whiskeytown Lake offers an immense amount of outdoor recreation, including boating, fishing, water skiing, and swimming, and the beautiful surrounding wilderness is great for camping and hiking. So get out there and enjoy what this modern marvel of plumbing and engineering has created!



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