Calabogue Creek is naturally tributary to Conesus Lake. An excellent dam site with rock foundation exists at a location upstream from the village of Conesus and a dam at this site could be built of sufficient size to impound the entire flow of ordinary floods. The drainage basin is clean countryside, with only one hamlet - Webster Crossing - and this is located about one-quarter mile away from the stream. There is an old mill and dam still in existence on Calabogue Creek at Conesus but no other developments or use of the stream. The Rochester Division of the Erie R.R. follows the east side of the Calabogue Creek valley in the vicinity of the reservoir site but at a sufficiently high elevation so that it would not be interfered with by the proposed reservoir. There is one third-class earth road crossing the reservoir site which would require relocation.
Water diverted from Calabogue Creek would be conveyed through a gravity conduit, i.e., without pumping, into the drainage basin of Livonia Creek and would thence follow the natural drainage channel of Livonia Creek into a retention basin adjoining the new Hemlock Reservoir.
In addition to Calabogue Creek there are three small streams naturally tributary to Conesus Lake which cross the route of the diversion conduit. Small intake dams would be constructed on these streams to divert their flow into the Calabogue diversion conduit.
The total area from which diversion from Conesus Creek drainage basin would take place is as follows:
Calabogue Creek ........................................ 9.38 square miles Other areas directly tributary to Conesus Lake ......... 2.67 square miles Total .......................................... 12.05 square miles
Conesus Lake serves as a source of water supply for the villages of Avon and Geneseo. The total drainage area at Lakeville, near the foot of the lake, is 72 square miles. The natural runoff from the 60 square miles remaining tributary to Conesus Lake after the proposed diversion will be many times the amount required for these villages.
As pointed out in conjunction with the discussion of water analyses, the mixture of the water from the Calabogue and Livonia areas in the manner described would provide water from these areas of quality and hardness similar to and comparable with that of the present effluent from Hemlock-Canadice Lakes.
Upon completion of the second stage of the project, i.e., after the Calabogue-Conesus areas are developed, the total drainage area supplying water will be 87.7 square miles and the net dependable yield 45 mgd.