The Grand Ditch, also known as the Grand River Ditch and originally known as the North Grand River Ditch, is a water diversion project in the Never Summer Mountains, in northern Colorado (United States). It is 14.3 miles (23.0 km) long, 20 feet (6.1 m) wide, and 3 feet (0.91 m) deep on average. Streams and creeks that flow from the highest peaks of the Never Summer Mountains are diverted into the ditch, which flows over the Continental Divide at La Poudre Pass at 10,175 feet (3,101 m), delivering the water into the Cache La Poudre River for eastern plains farmers. The ditch was started in 1890 and wasn't completed until 1936. The ditch diverts between 20 and 40% of the runoff from the Never Summer Mountains, and delivers an average of 20,000 acre feet (25,000,000 m3). It significantly impa