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- Season 10 1970-01-01
- Season 11 1970-01-01
- Season 12 1970-01-01
- Season 13 1970-01-01
- Season 14 1970-01-01
- Season 15 1970-01-01
- Season 16 1970-01-01
- Season 17 1970-01-01
- Season 18 1970-01-01
- Season 19 1970-01-01
- Season 20 1970-01-01
- Season 21 2009-08-08
- Season 22 1970-01-01
- Season 23 2011-10-06
- Season 24 2012-10-04
- Season 25 2013-10-03
- Season 26 2014-10-23
- Season 27 2015-10-01
- Season 28 2016-10-09
- Season 29 1970-01-01
- Season 30 1970-01-01
- Season 31 1970-01-01
- Season 32 1970-01-01
- Season 33 1970-01-01
Season 33 Episode
- Season 28 John Day River Paddleboarding and Behind The Scenes on Valhalla
- Season 28 Disappearing Meadows
- Season 28 Columbia River Bar Pilots
- Season 28 Crossing the Urban-Rural Divide
- Season 28 Who's Watching Oregon's Wildlife, Slot Canyon Geology and Eulachon Smelt
- Season 28 Wenaha River Packrafting, Outdoor Preschool and Tractor Museum
- Season 28 Mountain Goat Survey, Blue Mountain Wildlife and Vaux's Swift Chimneys
- Season 28 Tillamook Rock Lighthouse, River Snorkeling and The Ship Report
- Season 28 Lower Owyhee River, Bioluminescence and Oaks Bottom Forge
- Season 28 Return to Mt. Hood Glacial Caves and Columbia Gorge Geology
- Season 28 Oregon Prison Sagebrush Project, Oregon Star Party, Steam Up, and Scenic Oregon
- Season 28 Disappearing Lake, Bat Mystery, Jeff Douglas Remembered And Klamath Lake Canoe Trail
- Season 28 Farewell to Steve Amen
Oregon Field Guide - Season 28 Episode 5 Who's Watching Oregon's Wildlife, Slot Canyon Geology and Eulachon Smelt
10.00 48 minutes Who's watching out for the 600 sensitive species of Oregon wildlife? Find out why many biologists say Oregon is falling behind when it comes to protecting species across Oregon. Inspired by our recent visits to the Valhalla slot canyon, we wondered just how these unusual features form. And see how the Columbia River system's once-abundant smelt runs are officially threatened.
