Leardriver
Well-Known Member
My first years at the lake were 82, 83, and 84. My impression, having no interweb to contradict, was that those levels were normal
Last edited:
Is USBR projecting 12 million acre feet inflow for the whole year? Or just for the major spring runoff? If it's just for the spring/summer, and they release what they had previously planned to do in the summer (3.5-4 MAF), then the net volume increase of 7.5-8 MAF would be the most ever in one season (1979 has the record net volume spring/summer increase of 7.48 MAF). And a 7.5-8 MAF increase translates to a peak volume of 16.5-17 MAF... which is a lake level of 3640-3645...It cooled off considerably last weekend (we had snow in Pinedale), which explains the drop in discharge. As has been stated, the ridiculous snowpack numbers need to be taken with a huge grain of salt, since it is so late in the snowpack year. That being said, lots of water still coming. USBR now projecting 12 million acre feet to lake Powell!
I remember the mid-1980s. The water was so high on the Wahweap ramp that there was virtually no ramp. It was incredibly easy to load a houseboat and launch a satellite boat. Fortunately in those days there were a lot fewer houseboats and a lot less boat traffic in general. I cannot imagine those lake elevations with the crowds today. A single 2019 surf boat could swamp the restaurant and gift shop at Wahweap Lodge.Right, no question--those two years were off the charts. In those two years, the inflow from April through August was on the order of 15 million acre feet (MAF) each year, but because the lake was pretty much full already, over 10 MAF was released during each summer! If we had that kind of inflow this year, using this year's outflow amounts (normal summer releases, in conformance with an normal protocol), the net inflow would have been 11.2 MAF, instead of the 4-5 MAF it actually was in 1983-84.
Using the April 2019 starting point of 3568, if you add 11.2 MAF, you'd end up with a lake level of at about 3670, or a 102-foot rise! I don't think we'll see anything quite like that this year, but it will still be impressive...
Let me echo this post. That book is an amazing read. He talks a lot about the history of the river, how and why the dam was built where it was, the operation of the dam and what was happening in the backup discharge tunnels during the huge run off.Hey All
Great reading all around is " The Emerald Mile " by Kevin Fedarko. Massive runoff during the 83,84 year. Running the Grand Canyon At over 100,000cfs. Fun read !
The USBR June 24 Month Study shows regulated inflow to LP of 12.4 maf, and releases 9.0 maf for 2019 water year. That's based on watershed data for the end of May. And the peak level of about 3622.Right, no question--those two years were off the charts. In those two years, the inflow from April through August was on the order of 15 million acre feet (MAF) each year, but because the lake was pretty much full already, over 10 MAF was released during each summer! If we had that kind of inflow this year, using this year's outflow amounts (normal summer releases, in conformance with an normal protocol), the net inflow would have been 11.2 MAF, instead of the 4-5 MAF it actually was in 1983-84.
Using the April 2019 starting point of 3568, if you add 11.2 MAF, you'd end up with a lake level of at about 3670, or a 102-foot rise! I don't think we'll see anything quite like that this year, but it will still be impressive...
Animas dropped big yesterday in Durango. Afternoon thunderstorms are a thing past few days but I do believe the peak has come and gone from the San Juan drainage. Still lots of snow so it should maintain a good flow for weeks to come.Well, it was inevitable but it looks like the flows into Powell are beginning to slowMaybe cooler temps have temporarily slowed things and the lower releases from Blue Mesa and Navajo might be a weekend thing. I sure hope so as I love getting up early to see Powell has risen 1.xx feet from the day before...
Inflows have definitely peaked and are coming down. What a great water year and lets hope for the same or better next year. With everything above Powell near full this year, a heavy snowpack next year will go straight into Powell (and then Mead). We get the next 2 years like this one, both Mead and Powell will be near full!