Irrigation. Colorado Grand river ditch built; cost; water supply & storage., Canals under way by various companies cost, Tunnel drainage to be used for irrigation by Park Center Land & Water coo Irrigation controlled by North Poudre irrigation coo North Poudre irrigation coo reservoirs construction 1902.` Grand River ditch constructed by Water supply & storage coo cost, Sand cr. ditch completed;cost;difficult engineering. Douglas reservoir construct-ed;cost; capacity. Denver Republican Jan. 1,1903 p.llc.l.