page_title: Marshall Pass
section_title: Water diversion
hierarchical_section_title: Marshall Pass / History / Water diversion
caption_attribution_description: English: The Larkspur Ditch at Marshall Pass. The ditch brings water from the Colorado River watershed to the Mississippi River watershed through a ditch that crosses Marshall Pass. The ditch is mostly owned by the Lower Arkansas Valley Water Conservancy District.
context_page_description: Marshall Pass, elevation 10,842 ft, is a mountain pass in the Rocky Mountains of central-southern Colorado. It lies in northern Saguache County on the Continental Divide between the Sawatch Range to the north and the Cochetopa Hills to the south. The pass is part of a backcountry alternative to U.S. Highway 50 between Salida and Gunnison.
  Marshall Pass was discovered by and named for Lt. William L. Marshall, of the Wheeler Survey, in 1873.
context_section_description: In 1939, the Catlin Canal Company built the Larkspur ditch to divert water from upper Harry Creek (a tributary of Marshall Creek and eventually Tomichi Creek) south over the continental divide at Marshall Pass, delivering its water into Poncha Creek and thence to the South Arkansas River.  The 1.5 mile (2.4 km) ditch has a capacity of approximately 8 cubic feet per second (0.2 m³/s) and average annual deliveries between 1990 and 1999 were 31 acre-feet (38,000 m³).
  The Lower Arkansas Valley Water Conservancy District entered a cooperative agreement with the Catlin Canal Company to improve the ditch in 2004, doubling the length of the ditch and increasing its average annual delivery to over 300-acre-feet (370,000 m³).  The water district completed purchase of the ditch in 2011.
caption: Larkspur Ditch at Marshall Pass
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