Dams, not in-flows from tributary streams, have the biggest impact on
water temperatures in the Columbia/Snake river mainstem, according to preliminary
study results previewed Thursday in Portland.

That assessment, based on a modeling exercise, was announced during
the first day of the two-day Columbia/Snake River Mainstem Water Temperature
Workshop.

The gathering, sponsored by a variety of federal, state and tribal entities,
was designed as an exchange of information and ideas on how