Yellowstone River Drainage from Lamar Confluence to Yankee Jim Canyon Professional Review and Guide
"From its confluence with the Lamar River and 35 miles downstream to the head of Yankee Jim Canyon, the Yellowstone River flows in a northwesterly direction through canyon and narrow valley country. The upper segment from the Lamar River to Gardiner is in Yellowstone National Park. The lower segment from Gardiner to Yankee Jim is in Montana; hence, Montana fishing regulations apply. The key features of Montana’s regulations are the year-round season and catch-and-release for cutthroat. Montana’s tributary streams are open from the third Saturday in May through November.
With few exceptions these waters are high and unfishable during the spring runoff period in May and June. Several tributaries, the most significant of which is the Gardner River, join the Yellowstone in this section. This eTrail contains information on Yellowstone River (Gardiner to Corwin Springs, Corwin Springs to Yankee Jim Canyon), Black Canyon of the Yellowstone, Blacktail Deer Creek and Blacktail Lake, Hellroaring Creek, Bear Creek Drainage, Gardiner Townsite, Sportsman's Lake, Mol Heron and Cinnabar Creeks, Cedar Creek, and Slip and Slide Ponds."