officially recognized the Westside Railroad District, adding it to the National Register of Historic Places. This addition once again expands Missoula's Downtown Historic District, after the February, 2011 addition of Free Speech Corner at Higgens Avenue and West Front Street. Free Speech Corner commemorates the free speech fights of the Industrial Workers of the World, a union formed in 1905 which sought to organize timber, lumber and mining workers into one worldwide union. University of Montana The University of Montana (UM) is the oldest and largest university in Montana. Established in 1893 and opened in 1895, the Missoula campus has an enrollment of over 15,000. The university campus is the site for numerous public events including athletics, concerts, lectures, and conferences. The university is also the location of the Montana Museum of Art & Culture, the SpectrUM Discovery Area, the state's Regional Federal Depository Library, and houses the State Arboretum. Three other Montana colleges within the Montana University System are administratively affiliated with the University of Montana: University of Montana - Western, Montana Tech, and the two-year University of Montana – Helena College of Technology. Sports Missoula plays host to a variety of intercollegiate, youth, and amateur sports organizations in addition to a Minor league baseball team. The Montana Grizzlies' football and basketball teams of the University of Montana have the highest attendance. The Montana Grizzlies football team has a successful program within the NCAA D-1 FCS level. Their home games at Washington–Grizzly Stadium have a near 90% winning percentage and average over 25,000 spectators in attendance. All games are televised throughout Montana. The Grizzlies men's and Lady Griz basketball teams have also been successful at the conference level where they both rank at or near the top in attendance, about 4000 and 3000 respectively, and play their home games at Dahlberg Arena. Missoula is also home to the Missoula PaddleHeads, an independent baseball that that plays in the Rocky Mountain-based Pioneer Baseball League. They play their home games at Ogren Park at Allegiance Field. The Missoula Maulers were founded in 2007 as a Tier III Junior Ice Hockey. The Maulers play in the newly formed American West Hockey League made up of other Montana and northern Wyoming hockey teams. Also competing regionally are the Hellgate Rollergirls, a roller derby team that competes at the Adam's Center, and the Missoula Phoenix, an AAA semi-pro football team in the Rocky Mountain