Dennis,
Thanks. The reason I find the Snoqualmie and Tolt seals interesting is
that, although they may not be as far inland as the Columbia River sea
lions, they have made their way through some quite shallow water and swift
currents not found in the lower Columbia. A seal found above Carnation
would have had to navigate a few shallow riffles, possibly even 'hiking'
through shallow areas it seems. The lower Columbia is basically a low
gradient estuary to within a few miles of Bonneville dam, a seemingly less
adventurous destination than either Harrison Lake or Carnation.

Do seals/sea lions make it past Bonneville? They could easily navigate the
locks if so inclined.

For anyone that is interested, Bonneville Dam (elev 18 ft) is more than 130
river miles from the ocean, Harrison Lake (elev 36 ft) in BC is 78 river
miles, while the Tolt River in Carnation (elev 110 ft) is 47 miles.

Scott R a y
Yakima, WA
mryakima at gmail dot com
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://mailman1.u.washington.edu/pipermail/tweeters/attachments/20090216/01ad22f2/attachment.htm