This undated photo shows the former Monroe Street Dam power house and the land that later became Huntington Park. The Monroe Street Dam is the oldest continuously operating hydroelectric plant in Washington. Only a few months before the 1889 fire, Washington Water Power, now called Avista, was formed by a group of Spokane businessmen to make electricity with power from the Spokane River. The Edison Electric Illuminating Company had formed a few years earlier. Even with both companies in operation, demand exceeded supply. Early on, all the power went to streetlights and a few businesses. After the fire, WWP began building the Monroe St. project, creating a spillway and an intake for a generator at the foot of the Monroe St. Bridge. Instead of a water wheel submerged in a roaring flume, the Lower Falls Generating Plant would have a penstock, an enclosed waterway leading to a generating turbine. The powerhouse sat on the south bank next to the bridges foundation. River water entered beneath the substation on Post St. and gravity built the pressure as the water sped toward the turbine below. In those early years, the small power company merged with the Edison Company, ran streetcar lines, operated Natatorium Park, built a high voltage line to power mining operations in Idahos Silver Valley, sold electric appliances and built more dams. The century-old Lower Falls building was removed in 1990 and the new generators moved underground. The machinery now sits below a octagonal steel cover in the plaza of Huntington Park. The original 1890 generator, after a century of service, was sent to the Henry Ford Museum. In 2014, Avista renovated Huntington Park and created a new plaza between the Post St. substation and the Spokane City Hall as part of the companys 125th anniversary. The Monroe St. project can produce up to 15 megawatts, depending on demand and river flows. It represents about two percent of Avistas generating capacity. Most of that power is used in the downtow
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