Spine and I went canoeing in the slough last weekend, and he blogs about it here. One thing I forgot to reference in my comment there was this fine history of the slough.
Find out what's a slough and how is it pronounced.
On a darker note, Spine mentions bodies partly in jest, but seriously -- just a couple years ago they found this woman's body cut up and put in a suitcase into the slough. Her boyfriend did it, of course. When I told Betsy I was going on the slough with someone and used a masculine pronoun she got all worried it was someone I'd met on the internet or something and was like, "be careful!"
I tried to find a reference to that slough cut up body story in the internet, but get nada with searches like "columbia slough" + "cut up body" "suitcase" "murder" etc.
OK -- this might work.
If not, I'll give you the highlights:
"Divers began searching the Columbia Slough at Kelley Point Park for Brown's body and evidence in the murder and soon recovered human remains from the slough."
and
"Police stopped searching and asked the public to watch area waters for a green, Army-style duffel bag that possibly held clues to the murder and more remains."
Sure enough, someone found it at the beach, but not the slough beach.
Anyway -- yay! The slough is fun!!!

Oops--that's the Slough history I meant to link to. Oh well.
about dot com sucks!