From the Summit County Citizens Voice (Bob Berwyn):
In Park County, the water [delivered from the Roberts Tunnel] empties into the South Platte River, feeding the Front Range Reservoirs that have enable Denver to grow into a thriving metropolis at the cusp of the Great Plains and Rocky Mountains. Water diverted from the Blue River Basin in Summit County provides nearly 40 percent of Denver Water’s supply.
The tunnel turns 50 this year, and Denver Water is commemorating the birthday with an invitation-only two-hour ceremony at the Roberts Tunnel headquarters near Grants. Denver Water employees, retirees who worked at the tunnel and Park County commissioners will take a journey through the history of the Roberts Tunnel, with presentations and discussions highlighting the past 50 years.