Methods were developed to assess the effects of dams on streamflow
and water temperature in the Willamette River and its major
tributaries. These methods were used to estimate the flows and
temperatures that would occur at 14 dam sites in the absence of
upstream dams, and river models were applied to simulate downstream
flows and temperatures under a no-dams scenario. The dams selected
for this study include 13 dams built and operated by the U.S. Army
Corps of Engineers (USACE) as part of the Willamette Project, and 1
dam on the Clackamas River owned and operated by Portland General
Electric (PGE). Streamflows in the absence of upstream dams for
2001-02 were estimated for USACE sites on the basis of measured
releases, changes in reservoir storage, a correction for
evaporative losses, and an accounting of flow effects from upstream
dams. For the PGE dam, no-project streamflows were derived from a
previous modeling effort that was part of a dam-relicensing
process. Without-dam streamflows were characterized by higher peak
flows in winter and spring and much lower flows in late summer, as
compared to with-dam measured flows.
General
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