Small Quakes May Have Caused the Oroville Dam Spillway Collapse

1 02 2019

2018 –

Oroville Dam Quakes in February Related to Spillway Discharge

18 December 2018 –  A closer look at small earthquakes that took place at the Oroville Dam in California’s Sierra Nevada foothills in February 2017—near the time when the dam’s spillway failed—suggest that the seismic activity was related to reservoir discharge that opened and closed fractures in the rock below the spillway.

It seems likely that fluid leaking through cracks in the main spillway altered the pressure on the underlying rock fractures, causing them to slowly open and then slam shut, over and over, according to the report in the Bulletin of the Seismological Society of America.

Researchers at the U.S. Geological Survey were able to detect more than 19,000 very small seismic events that occurred over the past 25 years, apparently as the result of these fractures opening and closing underneath the spillway. . . . ”  (more)


It looks like dam operators who didn’t do the upkeep are to blame.


5 04 2018

Lots of rain in California recently – –




See the upper right sidebar for the link to the LIVE DATA
from Oroville dam.


Springtime in California

25 03 2018

The Watchers –
Record-breaking rain hits California, worst yet to come

Maven’s Notebook – The ‘nightmare’ California flood more dangerous than a huge earthquake; Sierra snowpack water content more than triples in one month; Experts fault SF water agency in scare at Moccasin Reservoir; and more …

Igeeks Magz – Storm drops record-breaking rain in parts of California – has map

Index to Oroville Dam articles, live data links

Oroville Dam Emergency Spillway problems, landslides

16 03 2018

From Susan Wolding


Oh,and we have new stuff on the lab under the dam

See the top of the right sidebar for
more on the dam

Oroville Dam – How’s that snow melt in the Sierras?

4 07 2017

We don’t know how the dam is doing since the Live Data page has been konked out for days. <<< UPDATE (7-12) It is back on line ….

They look busy on the LIVE CAM but with all the tearing up it looks like they won’t be able to handle a big out-rush of water.


This dam, south of Sacramento is releasing water full blast –


Susan Wolding – Dams of California are they ready? July 2017 Shocking!!! NEW!!!




10th annual Orange County Water Summit


We still want to know where all the snow melt in the High Sierras is going to go.

Additional in the COMMENTS  ▼

Watching Sierra Snow Melt (Oroville Dam Threat) – Weird Cold Snap

12 06 2017

The Watchers Rare, winter-like June storm hits Northern California

A rare, winter-like June storm hit Northern California early Sunday afternoon, June 11, 2017, bringing sharp temperatures drop, heavy rain, hail, frequent lightning, and even snow in some higher elevations. The weather is expected to clear up by Monday morning, but overnight low temperatures in Sierra could stay below freezing for as many as 2 to 3 more nights, NWS said. . . (more)

And over the weekend there was a mysterious drop on water inflow at the dam –


Stay Tuned …

Oroville Dam ALERT! Here Comes the Snow Melt! 9X More IN than OUT

28 05 2017

graphics soon….

INFLOW NOW 121.5k cfs  OUT: 13.5k cfs

outflow numbers

(the LIVE DATA links are on the DAM WATCH GUIDE
upper right, sidebar )



Are California newspapers covering this up??? The only Sacramento Bee headline today about the snow melt focuses on insect problem. Almost no headlines after Friday. Is it because they don’t want to dent tourism for Memorial Day?

Rapid snowmelt will continue around Lake Tahoe; flood advisory in effect in central Sierra Nevada

Highway 41 To Yosemite Road Closure Extended

Lake Oroville expects busiest weekend of the year

Road conditions/closures may give a clue. Butte County (Oroville dam) is in Area 3 on the CalTrans map.

UPDATE Sunday afternoon (EST)

??  ??

INFLOW went from 121½ thousand cfs down to thousand cfs – – (!!!)WHERE DID ALL THE WATER GO???