[EarthResearcher333]

Blueprints of Early Wing Delta Main Spillway Design:

By topology matching of this early version "Wing Delta" Main Spillway Design, this blueprint lends credence to an "early" construction "grading" of the "saddle" area if this option moved forward (from hydraulic flow modeling testing & design). The left side "wing" follows the grading into where the 60FT high section of where the Emergency Spillway Wier now exists.

Replacing prior excavated material, even if fractured rock, would have been an unpopular choice. IT would have been easier to design a Tall Emergency Spillway Weir and then taper it. re: discussion on "origin of "focused wash basin". note: See post 1554 for original discussion of the "Wing Delta" Main Spillway Design.

[mad_as_he$$]

HEAVY RAIN...Rainfall amounts of up to 3-6 inches are likely in
the Sierra through Tuesday morning, with 1-2 inches in the valleys
of northeast CA and western NV and 2-3 inches in the foothills
west of Highway 395. For northwest and west central NV, between
0.50 and 1 inch is probable north of US-50 with less than 0.50
inch south of US-50. Heavy rain is expected to bring widespread
flooding concerns to the region—including small stream flooding,
urban flooding, mud and rock slides, as well as increases to
mainstem rivers. See our hydrology section below for more details
on flooding.
.HYDROLOGY...

. Major flooding now expected for the Middle Fork of the Feather
River near Portola.
. Truckee River at Reno and Vista along with the Carson River near
Carson City and Susan River at Susanville forecast to reach
monitor stage.
. Flooding likely for creeks, streams, urban areas and drainage
basins in the Tahoe Basin, eastern Sierra, northeast California
and western Nevada early Monday through early Tuesday.

A strong atmospheric river will push into the region today through
through Tuesday morning bringing heavy rain and rising snow levels.
Currently, snow levels are expected to be around 6500 feet in
northeast California and around 7500 feet for much of the Sierra and
western Nevada. Precipitation totals in the Sierra could reach 3 to
6 inches, with 2 to 3 inches in the Carson Range and much of the
Susan, Pit, and Middle Fork of the Feather river basins. 1 to 2

US Weather Service Reno.

It started raining here in north Reno about an hour ago. Temp 38 degrees.

[tomkat]

Of course it's too late now, but has anyone else wondered, given the underlying geology of this particular location, if a better spot couldn't have been found for this dam ?

Inherent skepticism leads me to suspect that the financial interests of someone, or group of someones, might have played more of a role in siting at this location than engineering considerations.

I'll admit to being unfamiliar with the area's geology, but ER's research above hints at a sort of Rube Goldberg approach to making it all fit just here, as opposed to somewhere the topology might have been better suited.

/venality theory

[LucyT]

Quote with photo: If this picture was taken yesterday than the water is higher than then what they are saying already. Remember the water has been lowered over 50 feet. There is a rock wall below that grass on the left where those logs are at!