Removing Matilija Dam:
About the Matilija Coalition:
This is the back side of the dam with the water drained out of the reservoir.
Current estimates place the sediment volume impounded by the dam at approximately 6 million cubic yards. Over half of this volume is sand, once destined for the beaches of south Ventura County.
This figure shows the historic storage volume and sediment deposition of the reservoir. The reservoir storage is predicted to be zero by 2020.
This diagram shows the current size of the reservoir. Although there is still considerable surface area, the water depth is very shallow (1-30 feet)
This figure shows the compostion of sediments trapped in the reservoir.
The dam traps the coarse particles
(sand, gravel, and cobble) which settle out in the reservoir, while passing
much of the finer silts downstream. This not only impacts the beaches,
but also the biological integrity of the lower reaches of the Ventura
River which now lacks gravel spawning beds for fish.
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Page last updated: May 2002