The Boreas Pass Ditch was completed in 1910 to divert water over the pass from the headwaters of Indiana Creek, a tributary of the Blue River into North Tarryall Creek, a tributary of the South Platte River. The 0.8 mile (1.3 km) ditch has a capacity of 16 cubic feet per second (0.45m3/s), and in an average year, it transports about 140 acre-feet (170,000m3) of water. The ditch was originally built to irrigate land in South Park, but it currently serves the city of Englewood, which rehabilitated the ditch In 1990.