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The Mono-logue » Greg, Information & Restoration Specialist

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Saddlebag Lake Reservoir spills

Tuesday, August 8th, 2017 by Greg, Information & Restoration Specialist
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Water courses down the Saddlebag Lake Reservoir spillway, possibly for the first time ever. Photo by Bartshe Miller.

For the first time since at least as far back as 1983, Saddlebag Lake Reservoir on Lee Vining Creek is spilling. This is a rare event—and possibly a first—for the highest lake you can drive to in California.

Saddlebag Dam, at 10,090′ elevation, was built in 1921 to enlarge an existing alpine lake for hydropower generation purposes. The dam was raised and a spillway was added in 1925. The reservoir is oversized compared to the volume of water produced in its watershed, and given the agreement between Southern California Edison (SCE) and the Los Angeles Department of Water & Power (DWP), which requires it to be very low every spring. It is unclear if it has ever spilled before now. Last week it was inches away from its spillway, at the end of the day on Monday it was very full at 9,400 acre-feet of water, and on Tuesday it spilled! (more…)

Mono Lake likely to rise four feet over the next year

Tuesday, March 21st, 2017 by Greg, Information & Restoration Specialist
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Last week the Los Angeles Department of Water & Power (DWP) released its preliminary runoff forecast based on record-breaking March 1st snow surveys: 195% of average runoff for the April 1, 2017 through March 31, 2018 runoff year. This volume of runoff is very similar to 1983, the wettest runoff year on record. Due to the warm storms in January and February, the lower-elevation snowpack below about 9,000 feet above sea level is much lower than in 1983, so we are assuming that record runoff is a high-end scenario. That forecast also assumes median precipitation over the next year.

Based on 1983 as a high end, 1995 as a probable scenario, and 2006 as a lowest possible scenario, we modeled the likely rise in Mono Lake based on those past year inflows and probable reservoir operations this year. The result? A 3.8-foot rise in Mono Lake is likely over the next year. Expected Grant Lake Reservoir operations add about half a foot to our forecast.

A 3.8 foot rise in Mono Lake is likely over the next year. (Click on the graph to enlarge it.) Graph by Greg Reis.

All three scenarios have little or no rise before May and a similar rise in May and June, since snow can only melt so fast, (more…)

Mono Basin March 2017 snowpack breaks March and April records

Tuesday, March 7th, 2017 by Greg, Information & Restoration Specialist
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After the wettest February since 1986 at some survey sites, Mono Basin snowpack is more than double the March 1st average!

Snow water equivalent (SWE) ranges between 205% and 244% of average at the five snow survey sites in the Mono Basin (called snow courses). Gem Pass, Ellery Lake, and Saddlebag Lake have the highest March SWE on record. At the lowest-elevation snow survey site—Gem Lake at 9,150 feet above sea level—SWE was about 10 inches shy of the 1969 record, but it had reached the 1983 amount. The Tioga Pass snow course was 5 inches shy of the 1983 record. In the map below showing the snow courses, portions of the Lee Vining Creek (top) and Rush Creek (bottom) watersheds are outlined.

At Ellery Lake and Saddlebag Lake, in the Lee Vining Creek headwaters, March 1st SWE was already higher than the record April 1st SWE set in 1983. Map by Robbie DiPaolo.

At Ellery Lake and Saddlebag Lake, in the Lee Vining Creek headwaters, March 1st SWE was already higher than the record April 1st SWE set in 1983! Map by Robbie DiPaolo.

(more…)

Mono Basin snowpack is 200% of average for February 1

Sunday, February 5th, 2017 by Greg, Information & Restoration Specialist
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February 1 snow surveys conducted over the past week revealed an approximately 200% of average snow water content in the Mono Basin. This puts the April 1 average at just over 120%.

Outlook for April 1, 2017 peak snowpack at the Mono Basin's five snow courses based on February 1 snow surveys and historic data.

The current outlook for April 1, 2017 peak snowpack at the Mono Basin’s five snow courses based on February 1 snow surveys and historic data. Graph by Greg Reis.

It is still early in the season, but even with a dry February and March, it will be an above-average year, and with an average end to the season it will be a wet year. With a wet February and March, new April 1 records could be set!

Mono Basin precipitation is among the wettest years so far

Thursday, January 26th, 2017 by Greg, Information & Restoration Specialist
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At the end of the wettest January in the 29-year record for Lee Vining, how do Mono Basin season totals for precipitation and snowfall compare to other years? The season precipitation total (since October) of approximately 15.84 inches of water is among the wettest years recorded since 1989. It is the second-wettest year to date (1997 was the wettest) that we’ve recorded in 29 years as of the end of January.

Lee Vining Monthly Precipitation

Lee Vining monthly precipitation. Graph by Greg Reis.

At Cain Ranch, five miles south of Lee Vining and more representative of the precipitation that falls on Mono Lake itself, the 2017 seasonal total of 9.44″ to date is sixth-wettest in 86 years. For both Cain Ranch and Lee Vining, these totals fall into the wettest 7% of years. (more…)

DWP completes this year’s export of 4,500 acre-feet of water from the Mono Basin

Saturday, November 5th, 2016 by Greg, Information & Restoration Specialist
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When Mono Lake is between 6377 and 6380 feet above sea level, and the final May lake level forecast (and any subsequent projections) shows that it will stay above 6377 feet, the Los Angeles Department of Water & Power (DWP) is permitted to export 4,500 acre-feet of water that year. Any time Mono Lake falls below, or is projected to fall below 6377 feet, exports must stop.

Photo by Bartshe Miller.

A blustery day in mid-October kicked up clouds of alkali dust over Mono Lake’s eastern shore. Mono Lake may drop below 6377 feet above sea level next year, which means no water may be exported to Los Angeles. Photo by Bartshe Miller.

Operations plan guidelines state that the water should be exported late in the summer, and this year, DWP exported this water September through early November, allowing more water to remain in Grant Lake Reservoir during the summer—a good thing that kept the reservoir higher during recreation season and likely kept water temperatures cooler for fish in Rush Creek. (more…)

Fifth wettest October on record in the Mono Basin

Wednesday, November 2nd, 2016 by Greg, Information & Restoration Specialist
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At Cain Ranch, a precipitation station five miles south of Lee Vining that is representative of precipitation patterns on Mono Lake, October 2016 precipitation was 2.1 inches. This was the fifth-wettest October since 1931 and about 325% of average. Two of those other wet Octobers occurred in 2009 and 2010.

rainy-october-2016-10-30-north-basin-rainbow-elj_9161

October 2016 was also the sixth-wettest month at Cain Ranch in the last decade, and curiously three of those months were the Octobers mentioned above. The other three months that were wetter than October 2016 were December 2010 and 2012 and May 2015. Aside from the wet Decembers, this pattern is unusual, since December and January and February are usually the wettest months of the year.

The rain in the last week raised all the creek flows and also raised Mono Lake from 6377.12 to 6377.19 feet above sea level, putting it back on track with the lake level forecast DWP made in the spring.

The sixth grade science of Mono Lake

Wednesday, March 9th, 2016 by Greg, Information & Restoration Specialist
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Last week, I received a text message from Luis Santos, a friend and coordinator of The Grateful Dads, a hiking group to which I belong. He was wondering if I could come talk to his sixth grade students about Mono Lake, since they were studying it in science class.

MLC Information & Restoration Specialist Greg Reis speaking to sixth graders at Ecole Bilingue Berkeley. Photo by Luis Santos.

The Committee’s Information & Restoration Specialist Greg Reis speaking to sixth graders at Ecole Bilingue Berkeley. Photo courtesy of Luis Santos.

I immediately was excited about the idea. I love sharing the Mono Lake story, and my field seminars have been highly rated. Also, my own sixth grade science class and my teacher, Mr. Lewis, were very influential in my life, and I can trace many of my current interests and scientific curiosity back to that time. (more…)

A wetter but still below-average winter in the Mono Basin

Thursday, February 25th, 2016 by Greg, Information & Restoration Specialist
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The strong 2015–2016 El Niño winter is likely to turn out below-average in the Mono Basin. The 90% of average February 1st snowpack, and an 80% of average preliminary runoff forecast based on that snowpack, were followed by a dry February. In the next week, March 1st snow surveys will reveal how bad things are. A wet March might be able to catch things back up to average, but it would take a very wet spring to shift the snowpack and snowmelt runoff above average at this point. From 1980–2010, the lowest March snowpack that resulted in above-average runoff was 110%. (more…)

Mono Basin Clearinghouse updates: Gull research and real-time data

Monday, January 4th, 2016 by Greg, Information & Restoration Specialist
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clearinghouse-updates-2015-CAGU-report_Page_01Recent updates on the Mono Basin Clearinghouse include the following items:

Point Blue has finished its 2015 report on the nesting success of California Gulls at Mono Lake. According to project coordinator Kristie Nelson, it was an above-average year—a welcome finding after a downward trend of below-average populations over the last ten years.

We have updated the Mono Basin real-time data frames page to use pop-up windows instead of frames. This may not sound like an upgrade, but (more…)

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