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| ODFW fish biologists (left to right) Rob Dietrich, Todd Alsbury, and
Danette Faucera, run a sein net through the Sandy River to collect
spring Chinook for two years after Marmot Dam was removed, and a fish
trap at the facility was also destroyed. Later on, ODFW used portable
weirs to do this job as fish management evolved. (ODFW file photo |
Ten years after Oregon’s largest dam removal, salmon and steelhead rebounding on the Sandy
Thursday, October 19, 2017
CLACKAMAS, Ore. – Ten years ago a new era of salmon and
steelhead recovery quite literally started out with a bang when Marmot
Dam was removed from the Sandy River.
More than a ton of high-grade explosives were detonated, taking off the face of the 47-foot high concrete dam.
At the time, it was the largest dam breach ever attempted.
Portland General Electric, owner of the dam, figured it would be more
cost-effective to remove the structure than upgrade it to meet new
federal re-licensing standards.
In July 2007, in a highly publicized event, PGE blew the
concrete face off its dam on the Sandy River. For the next three months,
large backhoes with pneumatic hammers pulverized, drilled, pulled apart
and hauled off the remaining pieces of the dam. On Oct. 19, a rainstorm
swept away the backfill that had accumulated behind the dam, making the
Sandy totally free-flowing again,...