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Here's a choice quote from this document:

There's a painting of the dam at the visitor center that appears to show a design with: a) The larger, combined outlet works you mention (including concrete apron for what I guess would be proper auxiliary flood control) b) An unlined spillway channel c) A spillway alignment closer to...

Not sure if this is the right thread or if this should go in the main thread: I think there's evidence that the ES experienced very minor flow during the Jun 2011 high pool event. Open this image full size and check out all of the debris sitting on the downstream side of the ES weir, which...

Here's this graphic overlaid on the 4/14/2015 Google Earth Imagery:

Nice find. There are two other areas with similar appearance in that image. Check out where the next one upstream is: That's very close to if not coincident with the current upstream failure progress. The other place you find these is about 500' down from the gates:

wxBell has added an Oroville area map to their presentation of the NWS NCEP WPC QPF (o_O National Weather Service National Centers for Environmental Prediction Weather Prediction Center Quantitative Precipitation Forecast): http://weather.graphics/hpc/wpc_precip.php The Oroville map is...

Here's the source I was thinking of - but it turns out the 5cm figure: a) Is modeled, not measured (although this is a straighforward computation) b) reflects elastic accommodation in the lithosphere, not isostatic compensation Beck, J. L. "Weight-induced stresses and the recent seismicity at...

I don't have the cite handy, but the isostatic depression after filling the reservoir from empty was about 5cm.

Strong agreement with the points in your entire post. In addition to differential erosion following bedding planes, there are known vertically dipping shear zones in both abutting ridges that strike perpendicular to the plane of the dam and exhibit chemical weathering to 100': The identified...

Relevant to the quality of the rock uderlying the lined spillway, from the "California State Water Project" text: Note that there's no comment on structural risk due to erosion. Elsewhere in the text, it's noted that both abutting ridges have steeply dipping shear patterns that strike...

Here's the NWS Quantitative Precipitation Forecast through midnight Thursday with an overlay of the Lake Oroville watershed: The precipitation scale is at the top. The overlay comes from a map with a slightly different projection but it's mostly within one or two forecast cells of the correct...