Oh fer...it's just east of where Little Lost River joins it, of course. Good fishing in the Big Lost River, too -- lots of dustmouth bass and dun trout and sometime even a sand sturgeon has been hooked (but you can't even pull them from the water, just remove the hook and let 'em go).

Good dry flies for the Big Lost are zebra duns, black gnats, evening duns, sparse gray hackles, and tan adult caddis. I'd suggest a 10-weight rod as a minimum, with appropriate backing, line, and tippet...anything less and you might be left with a broken rod! Them fish are BIG, but you don't usually need anything bigger than a .38 if you don't plan to do catch-and-release.