Canyon Lake, near Tortilla Flat, Arizona, is down 54 feet. Crews are drawing the water down so they can inspect and maintain parts of the dam that normally sit underwater, a job that comes around about every 20 years. Arizona's Family reported that the drawdown has exposed a large portion of the lake bed.
What it exposed is two decades of everything that went into the water and never came back out.
Mostly All Junk
Deputies with the Maricopa County Sheriff's Office are helping search the exposed bottom. One member of the Sheriff's Office summed it up in three words: mostly all junk.
The list is familiar to anyone who has been under a reservoir. Vape pens, keys, sunglasses, shoes and hats. A wheelchair. A suitcase with old dive equipment inside it. At one point, deputies had to remove cars that had been sitting at the bottom of the lake.
The detail that stood out to them was the license plates. One deputy has impounded 35 plates for destruction so far, all found on ground that has been underwater since the last drawdown.
Deputies are watching for anything that needs to be removed, documented or investigated. They are not walking all of the shoreline yet. The lake bed looks dry and stable, the Sheriff's Office said, but only the surface is dry. The Forest Service will clean up the debris over the next couple of weeks, and the lake will stay closed until early next year.
Out of Sight Is Not Gone
Most lakes never get a drawdown like this. The water stays up, the bottom stays dark, and whatever went in stays where it landed. Canyon Lake is a rare look at what a reservoir collects when nobody is able to see it: twenty years of small losses, and a few very large ones.
The small things are a nuisance. The large ones are a different problem. A vehicle that goes into the water takes its fuel tank, engine oil, ethylene glycol and lead acid battery down with it. Under the Clean Water Act, a discharge that leaves a visible sheen on the water is reportable, and the U.S. Geological Survey has tracked petroleum contamination persisting in groundwater for decades at its research site near Bemidji, Minnesota.
The Same Is True in Utah
Utah's lakes and reservoirs hold the same kind of record. Our Utah Waterways Submerged Debris Atlas documents an estimated 499 submerged items across 20 Utah lakes, including 56 vehicles and 103 vessels that are individually confirmed.
We do not need to drain a lake to go looking. Fathom Restoration is a disabled-veteran-led Utah 501(c)(3) nonprofit, and our volunteer divers go down to the bottom and carry trash out by hand. On October 10, four of our divers worked Haws Point at Strawberry Reservoir and came up with about 35 pounds of trash by our estimate, including three folding chairs, an umbrella and a kite. On two September crew dives at Deer Creek Reservoir, we brought up about 58 pounds more.
The vehicles in the Atlas will take much more than hands. We are working to start recovering submerged vehicles, and we are doing it in order: insurance, permits and commercial dive certification first.
Twenty Years of Record
Canyon Lake will fill back up, and the bottom will go dark again. The next look is about twenty years away. In Utah, we would rather not wait for the water to leave before we deal with what is under it.
Fathom Restoration is a disabled-veteran-led Utah 501(c)(3) nonprofit running volunteer dive cleanups on Utah's lakes and waterways and building toward the recovery of submerged vehicles and vessels. Donate or volunteer at fathomrestoration.org.
Source: https://www.azfamily.com/2026/10/08/canyon-lake-drawdown-exposes-decades-debris/
