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Dammed if we do, dammed if we don’t.

A friend sent along these great videos of a coffer dam being breached in super-fast speed. This video has since circulated the Internet extensively, but in case you haven’t seen it yet…

Marmot Dam Removal – ‘largest dam removal in Oregon’

This video shows the intentional breaching of a coffer dam, the final phase in a process to return the Sandy River to a free-flowing state.

Just like the Marmot Dam, most dams are finally demolished because of significant upkeep costs and concerns for fish.

So, what is the shelf-life of a dam?

Many dams constructed in the early 20th century are beginning to age and show signs of disrepair. The Association of State Dam Safety Officials (ASDSO) is keeping a watchful eye over the dams in America. With over 79,000 dams in the United States, the ASDSO supposes there are thousands (3,316 to be exact) of dams susceptible to collapse.

…the number of dams identified as unsafe is increasing at a faster rate than those being repaired.
– ADSO

The possible failure of a dam is probably the most likely contender for its removal. But, many environmental, socio-economic, aesthetic, and cultural benefits also occur with the removal of dams.

We Build Them…

World’s Five Largest Dams by Volume (completed and proposed)


Source of Data: InfoPlease

And, then we take them down…

Three Largest Proposed Dam Removals in the World (so far)

  • If approved, four dams on the Klamath River in California and Oregon.
  • Two dams on the Elwha River are cited for removal in 2012.
  • Matilija Dam: Will this dam in Ventura County, California be removed?

American Rivers has compiled a list of dams removed from 1999 to 2007. They state around 713 dams have been removed, to date.

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Dam Nation: Dispatches from the Water Underground

This book, available through 100 Fires, was recently released by The Greywater Guerrillas, a water-aware environmental group out of the Bay Area focused on river restoration, dam removal, and installation of grey-water systems.

Both radical history of water and DIY guide to sustainable technologies, Dam Nation: Dispatches from the Water Underground combines an analysis of water’s history with the active fight for its future. Bringing together hundreds of national and international projects, organizations, and strategies, Dam Nation investigates political economy and environmental impact of water consumption. It also gives readers easy, cheap, and thought-provoking ways to join the ‘water underground’ themselves.