Fill in the Blanks Irrigation Online version Irrigation game for the Magrath Museum by Alyssa Doig 1 Card Magrath St Elliot Ora Dam Mary's slipscrape A Dam Galt 1899 Charles Pothole T C Magrath was established in . The three main men responsible for irrigation in Magrath were . , , and . . . A was the primary tool for digging canals . Later the irrigation project included the building of reservoirs . The Jensen's reservoir was originally named the , but was later changed . The Jensen's Dam was built before the . .