… [Karl] Bly runs a volunteer group called American River Lost & Found. He keeps more than a dozen kayaks, canoes and inflatables in his yard, garage and strapped atop his car, along with buckets filled with scores of oars and paddles. He has more than 30,000 followers on Instagram and 64,000 on Facebook. … Through word of mouth, people know that if they drop their phone, a wedding ring or their prescription glasses into the murk, Bly is the one to call. On a near-daily basis, especially in summer, he is contacted by people desperate to find something they have lost. Improbably, given how vast the river is, if they tell him where they were when they lost it, Bly knows the flows and currents well enough to have more than a fighting chance of finding it.