Sorry for the confusion. East Twin Lake is a Trout Management Lake = 3rd rod is legal. Any Trout Management Area (TMA), Wild Trout Management Areas (WTMA), Trout Parks, Sea-run Trout Streams and Trophy Trout Streams = 3rd rod is not legal.
2015 Angler's Guide on page 22 under the definition of ANGLING explains.
ANGLING Fishing with hook and line, which must be personally attended. No more than three lines, with or without rods, may be used at one time, except in the designated Trout Management Areas, Wild Trout Management Areas, Trout Parks, Sea-run Trout Streams and Trophy Trout Streams where the maximum number of lines that can be used is two, with or without rods.