Home Regional Offices Green River Region Green River Region News 2021 Mac Attack Derby 2021 Mac Attack Derby Posted: March 1, 2021 | Green River Region News News Registration opens on March 24 for the 2021 Mac Attack Derby. Register online at flaminggorgecountry.com Previous View All News Next Related News Cody Region News Public invited to discuss the North Fork of the Shoshone River fishery and proposed regulation changes Jan. 8 Green River Region News Flaming Gorge fishing contests take aim at lake trout and burbot Laramie Region News Public discussion to review angler survey results and management effects Want the latest updates? Sign up to get the latest news and events sent directly to your inbox. Subscribe to our email list