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Description
Thunder Bay Power Company (TBPC) is a hydroelectric company located in Alpena, MI. This company was formed in 1989. TBPC owns and operates four hydroelectric dams and two water storage dams in the Thunder Bay River Basin. The Federal Energy Regulatory Commission reissued a license for generation to TBPC on December 11, 1998. The purpose of this website is to provide a means of compliance monitoring to the state and federal agencies according to License Articles 401 and 402. TBPC has just completed the second year of a two-year testing period of various types of monitoring. For more information about the license articles that pertain to water quality, go to the Articles page. To view a map of our dam locations please click here. Please click on one of the thumbnails below to view the appropriate picture gallery. Ninth Street Development The Ninth Street Development includes: (1) an existing reservoir with a surface area of 700 acres and a total storage volume of 6,000 acre-feet at the normal maximum surface elevation of 598.25 feet National Geodetic Vertical Datum (NGVD); (2) an existing retaining wall, 6 feet high by 285 feet long; (3) an existing buttressed retaining wall, 145 feet long; (4) an existing abandoned fishway; (5) an existing concrete uncontrolled spillway section, 47 feet long; (6) an existing gated spillway section, 131 feet long, containing seven taintor gates, each 14 feet long by 12 feet high; (7) an existing concrete gravity non-overflow system, 47 feet long; (8) an existing reinforced concrete and masonry powerhouse, 92 feet long by 84 feet wide, containing (a) three horizontal shaft Sampson runner turbines with a combined maximum plant hydraulic capacity of 1,520 cubic feet per second (cfs), manufactured by the James Leffel Company and rated at 600 horsepower (hp) each, and (b) three General Electirc generators, each rated at 400 kW, providing a total plant rating of 1,200 kW; (9) an existing reinforced concrete non-overflow section (a retaining wall about 20 feet long); and (10) existing appurtenant facilities. Four Mile Development The Four Mile Development includes: (1) an existing reservoir with a surface area of 90 acres and a total storage capacity of 900 acre-feet at the normal maximum surface elevation of 634.35 feet NGVD; (2) an existing concrete ogee spillway (constructed immediately downstream from the original rock filled timber dam), 455 feet long, topped by neadle beams, containing: (a) a log shute bay, and (b) an abandoned fishway bay; (3) an existing concrete and masonry powerhouse, 72 feet by 72 feet containing: (a) a concrete forebay, (b) three existing horizontal shaft Sampson runner turbines with a combined maximum hydraulic capacity of 1,600 cfs, rated at 850 hp each, (c) three existing General Electric generators, each rated at 600 kW, (d) a proposed Flygt Corporation turbine with a maximum hydraulic cpacity of 295 cfs (providing a proposed maximum plant hydraulic capacity of 1,895 cfs), and (e) a proposed Flygt Corporation generator, rated at 600 kW (providing a total proposed plant rating of 2,400 kW); and (4) existing appurtenant facilities.