The site for the Kangaroo Creek Dam is on the Torrens River, 14 miles northeast of Adelaide. The dam is to provide 250 000 acre feet of storage for the Adelaide metropolitan water supply system. A diversion tunnel in the right bank, constructed during 1966, will provide permanent outlet works during operation of the reservoir. Details of the proposed dam are as follows: Rock fill, concrete slab upstream face. Upstream face 1.3 : 1, Downstream face 1.4 : 1 Total volume of rockfill 450 000 cu. Yards. Maximum height above stream bed 190ft. Crest length 440ft. Dam crest level, R.L. 910ft. Full supply level R.L. 900ft. A channel spillway, crest level R.L. 900ft. in the left bank is designed to pass a maximum flood of 40 000 cusecs. It is proposed to use rock from the spillway excavation as rockfill in the dam. Geological investigations of the site have included the following: • Regional geological mapping. Use was made of aerial photos and 1 inch to 1 mile maps of the Geological Survey of South Australia. • Detailed geological mapping. Outcrop maps, sections and profiles were prepared on scales of 1 inch = 40ft. and 1 inch = 10ft. • Detailed logging of cuttings along Old Gorge Road, Gorge Road Deviation and Access Road • Diamond drilling. 27 holes were drilled using NX and NMLC equipment. • Water pressure testing of drill holes • Exploratory adits. Two adits were constructed in the left bank, upstream from the site and logs were prepared on a scale of 1 inch = 10 ft. • Diversion tunnel. Logs were prepared on a scale of 1 inch = 20ft. • Laboratory tests on rocks. Samples were tested for strength and durability.