Bob shows us his awesome water sampler that shows temperature and dissolved oxygen content. Salmon need a dissolved O2 content of 8 - 14 ppm.
Powell shows us how to measure & grade the size of cobbles for salmon habitat. His cobble was a bit too big to be good, so we gave it an OK rating.
Bob stands 53' feet away and threw a log into the river to time how fast it would take to get to us.