Posts Tagged ‘lake level’
Technically, we did it on March 31, but for all intents and purposes, it’s the April 1 official joint reading of Mono Lake’s level with Mono Lake Committee and Los Angeles Department of Water & Power (DWP) staff together. This reading on this day is particularly important because the number recorded translates into how much water DWP is allowed to divert from Mono Basin streams over the course of the coming year.
So far in 2017, Mono Lake has risen an astounding 4.5 vertical feet before leveling off in the past month. About 3 feet of that total lake rise occurred from mid-May to mid-August. Watch below for a quick 20-second timelapse showing the incredible lake rise this summer, or scroll down and see the full two-and-half-minute timelapse video.
A mile of citizen-funded solar-powered electric fence is up and running, protecting Mono Lake’s nesting gulls—one of the three largest colonies in the world—from mainland predators. The fence is the result of a year and a half of planning by the Mono Lake Committee and California State Parks along with other agency partners, a dedicated local installation team, and generous funding from Mono Lake supporters across the country.
Why is the temporary fence—which will be removed when nesting is finished—needed? Five years of drought lowered Mono Lake seven feet, shrinking the protective moat of water between the lake’s north shore and Negit Island and adjacent islets—exposing a landbridge that allows coyotes access to the lake’s long-established nesting colony of California Gulls. Last summer signs were found on a few of these islets that coyotes had indeed walked the landbridge and then swum the remaining 500 feet or so of shallow water to prey on eggs and chicks, disrupting nesting and causing gulls to be suspicious of returning to these sites in future years.
Not a typical fence site
The electric mesh netting fence used for the project (more…)
The temporary electrified fence protecting Mono Lake’s nesting California Gulls has been up and running for about three weeks now. After a long and snowy winter the gulls’ calls signal spring’s arrival, and it’s gratifying to know that as they build nests and lay eggs out on the islands, they are protected from coyote predation.
The fence stretches for about one mile across the landbridge, and is made up of five sections that overlap—an electrified long middle section, two shorter electrified sections at the ends near the water’s edge, and two passive sections at (more…)
April 1, the beginning of the runoff year, is a particularly important day for Mono Lake. Each April 1 Mono Lake Committee and Los Angeles Department of Water & Power (DWP) staff walk down to Mono Lake and read the lake level, together. It is particularly important because it is the April 1 lake level that determines how much water is allowed to be diverted from Mono Basin streams to the City of Los Angeles for the year.
The first time I participated in one of these April 1 lake level readings was in 2015 when the lake had dropped to a level that triggered a 70% reduction of water exports. The second time, the lake narrowly cleared the level that would have halted water exports altogether. Years of drought lowered the lake and heightened concern over available exports, but this year was different. This year Mono Lake is on the rise. (more…)
This January is proving to be the wettest January in our weather recording history. In Lee Vining, we saw 5.5 inches of snow on January 4, and we received a combined 3.92 inches of rain on January 8 and 9. With all this water pouring into Mono Lake, I set out with my coworker Andrew to measure the lake level on cross country skis.
It was Wednesday, January 11 at 10:00am. The sky was blue, the wind was calm, and the day before had enveloped the basin in (more…)
This morning Mono Lake Committee staff met with Los Angeles Department of Water & Power (DWP) personnel to conduct the official annual April 1 reading of the lake level together. The consensus: Mono Lake stands at 6378.11 feet above sea level.
Mono Lake is now just 13 inches above the ecologically precipitous 6377-foot elevation at which the nesting islands become landbridged, lake salinity hits new highs, air quality problems worsen, and stream delta habitat conditions degrade.
With those concerns in mind, the State Water Board rules are more nuanced this year for determining whether or not DWP can export water to Los Angeles. Not only does the lake have to be above 6377 feet for today’s measurement, it also has to be forecast to stay above 6377 every day of the coming year. (more…)
This morning Mono Lake Committee staff met with Los Angeles Department of Water & Power (DWP) personnel to conduct the official annual April 1 reading of the lake level together. The consensus: Mono Lake stands at 6379.01 feet above sea level.
The lake has declined to a level at which water exports to Los Angeles are, by the terms of the State Water Board’s rules, automatically reduced by 70%. DWP will be limited to 4,500 acre-feet of water export, a lake-protecting restriction that no one, until recently, thought would ever be activated again. It was a solemn, though not unexpected outcome, given that California’s drought is entering its fourth year and the Mono Lake watershed is officially classified as being under “exceptional” drought. (more…)
Mono Lake dropped a 1/4 foot in July, and stood at 6382.3 feet above sea level on August 1st. This is very similar to the forecasted July drop in lake level of 0.2 feet.
Lee Vining precipitation in July was below average, despite a month full of thunderstorms. Average rainfall is about 1/2 an inch—only 0.12 inches fell, total. This followed a wet May and June, so April-through-July precipitation is slightly above the 2-inch average.
At the end of June, total Rush Creek runoff was almost exactly as forecasted—about 101% of average—but the monthly pattern wasn’t. April and May had higher runoff than forecasted and June was lower than forecasted, mainly as a result (more…)