APPROXIMATE ESTIMATE OF COST OF PORTAGE RESERVOIR, PLANS OF 1907. SUMMARY (quantities and prices). (Estimates on structures mostly by C. T. Rhodes, C. E.) The following are from rough preliminary approximations and are subject to revision after more complete survey and studies. They are however believed liberal. Land for reservoir, tunnel and power house.... Buildings to be removed for reservoir (as estimated by Mr. Shedd).. Relocation of Pennsylvania Railroad... Dam and spillway..... Highway bridges over reservoir.. Clearing reservoir.. New highways.... Moving cemeteries.. $750,000 770,000 770,000 2,091,000 125,000 25.000 40,000 15,000 $4,586,000 Add 10 per cent. for engineering and contingencies.... Total cost of Portage reservoir, estimates of 1907, as developed for storage COMPARISON WITH ESTIMATES OF 1896. 458,000 $5,044,000 It will be noted that the above total cost is double that estimated by Mr. Rafter in the State Engineer's Report of 1896, p. 703. in our estimates of 1907, the lands and buildings are estimated at about $870,000 more than in former estimates, a part of this being due to our having added 50 per cent. to the detailed approximate estimate of present market value to allow for extra costs and legal expenses connected with takings for public purposes. Our estimate for the dam is $1,311,000 more, due in part only to change in site in moving upstream from the limits of the park. For changing the railroad we figure $220,000 more, for bridges and wagon roads $35,000 more. As previously stated, our present figures rest on incomplete data and are subject to revision. It has been our intention to make these estimates on a liberal basis. The following details will make plain the basis used DETAILS OF PRELIMINARY ESTIMATE. PORTAGE PROJECT. APPROXIMATE COST OF LAND REQUIRED FOR RESERVOIR, ETC., WITH SPILLWAY AT ELEVATION 1,210 FEET ABOVE SEA. (See report of inspection by George G. Shedd, C. E., in appendix.) Area overflowed with water at elevation 1,200... The above figures are from State Engineer's report, 1896, p. 709. 12.3495 sq. miles 13.6875 sq. miles The new dam site is about 2,000 feet farther up-stream than the one proposed in 1896 and the intervening portion of the gorge is about 800 feet wide at elevation 1210, making about 40 acres to be deducted from the above figures. Disregarding this small amount, and assuming that the increase in area from 1,210 to 1,220 is equal to that from 1,200 to 1,210 gives a result of 15 square miles, or 9,600 acres. Deducting area of river bed, about 500 acres, leaves net amount to be purchased.. 9,100 acres For power-house and surroundings (above and below cliff, including river diversion) 1,500 x 800.... 25 acres For railway to connect with P. R. R. near Lewis' crossing, 15,000 x 100. 40 acres 96 acres The land for power-house site and the right of way for the tunnel should properly be acquired at same time that reservoir dam is built, in order to avoid possible future complications. APPROXIMATE ESTIMATE OF COST OF PORTAGE DAM AT NEW SITE ABOUT MILE ABOVE UPPER FALL. DAM OF THE ARCHED, RUBBLE CONCRETE TYPE FACE OF CONCRETE BLOCKS. 83,000 cubic yards earth excavation, $1.75. SPILLWAY $62,250 176.250 12, 110 28,000 268,300 cubic yards (cyclopean) concrete in dam and spillway, $6.50. 300 feet westerly extension of spillway, say...... 1,835 cubic yards concrete in bridge, $10.00... 1,210 cubic yards concrete in cornice and parapets, $12.00. 2,400 square yards slope paving, $1.00 $1,743.950 10,000 18.350 14.520 2.400 PORTAGE POWER PLANT AT SITE B. APPROXIMATE ESTIMATE OF COST (Estimates by R. D. Johnson, M. E.) SUMMARY (for details see following pages). Tunnel, including 2 working shafts and intake shaft. . . . . . $1,392,000 Excavation for power-house, penstocks and surge pipe shaft. 47,385 Concrete for power-house substructure, and linings of penstock, tunnels and surge pipe shaft.... 102,860 Concrete for transformer house, substructure. 18.580 Concrete lining for cliff at transformer house. Gates, valves and operating mechanism. Transformer house, superstructure. Hydraulic machinery. Electrical machinery. Cranes and auxiliary machinery. Railroad siding from Pennsylvania Railroad to power-house.. Steel work for penstocks, forebay, surge pipe (below ground), re-inforcing bars. etc........ Power-house superstructure.. 4,200 81.965 15,485 41.760 47,800 189.000 742,500 37.000 Add for transmission lines, equivalent to conveying 50,000 kilowatts to Rochester, say. 800,000 Total for power plant, tunnel and transmission line about... Adding to this the cost of the reservoir and dam and accessory works. Allow for irregular rock, timbering and contingencies, 15 per cent., or say $70 per foot for average conditions. SUMMARY OF DETAILED ESTIMATE FOR POWER-HOUSE, SITE B Rock excavation: Power-house site, including tailrace, say 2,000 cubic yards, at $1.30.... $2,600 14,000 For passage to valve chamber, 550 cubic yards, at $7. 3,850 For tunnel for exciter penstock, 35 cubic yards, at $7. 245 For riser shaft between elevation 727 and 877, 1,270 cubic yards, at $12.. 15,240 8.050 3,400 $47.385 Concrete: Power-house substructure, 10,195 cubic yards, at $7. $71,365 Covering main penstocks from outside face of power-house to end of intake special, 950 cubic yards, at $18. 17,100 Lining passage to valve chamber, 200 cubic yards, at $8. 1,600 Lining around exciter penstock, 25 cubic yards, at $9. 225 Lining riser shaft between elevations 727 and 877, 420 cubic yards, at $6.. 2,520 8,550 1,500 $102,860 Steel: Reinforcing steel in power-house substructure, 119,000 pounds, at $0.045... $5,355 11,685 Main penstocks from outside face of power-house to end of intake special, 558,000 pounds, at $0.0625. 34.875 Main penstocks, six intake special sections, 46,000 pounds, at $0.07. 3.220 1.890 By-pass piping, 13,000 pounds, at $0.055...... 715 Reinforcing beams between penstock at feeder head, 62,400 pounds, at $0.025. 1,560 2,960 30-foot cylinder at feeder head, 37,000 pounds, at $0.08. Bottom of 30-foot cylinder at feeder head, 11,500 pounds, at $0.07.. Riser from tunnel to elevation 875, 196,000 pounds, at $0.055. |