They have lockers on trian station, no any problem to use it. I don't remember exact cost, but it around 200-300 RUR (3-5 EUR) for a day. Also you can use luggage room on stadium (little bit extream, but comparing with Poland, Brazil or France during the Conf.Cup it works pretty good - no one can't take your bag, and service is very qiuck, I didn't spend more than 20 minutes to take my backpack in all 4 stadiums)
Denver is in the center of the Front Range Urban Corridor, between the Rocky Mountains to the west and the High Plains to the east. Denver's topography consists of plains in the city center with hilly areas to the north, west and south. According to the United States Census Bureau the city has a total area of 155 square miles (401 km2), of which 153 square miles (396 km2) is land and 1.6 square miles (4.1 km2) (1.1%) is water. The City and County of Denver is surrounded by only three other counties: Adams County to the north and east, Arapahoe County to the south and east, and Jefferson County to the west.