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Long Lake Hydroelectric Development
When it was completed in 1915, Long Lake was "the world's highest spillway dam." Its turbines were also the largest (both in size and capacity) of any in existence at the time. Today, the Long Lake development (HED) is capable of meeting the average energy needs of almost 35,000 households.
The picturesque plant with its four visible, exposed penstocks can be viewed from a public observation area north of the Spokane River, just off Highway 291. The paved, universally-accessible viewpoint directly overlooks the Long Lake spillway. Nesting ospreys can be seen nearby.
Avista has constructed a public picnic area with playground equipment on the south bank of the river. Located approximately one-half mile west of the dam, this day-use area is accessed by a paved entry road, directly off Highway 231.
Long Lake's 24-mile-long reservoir, commonly called Long Lake or Lake Spokane, provides numerous fishing, boating, and swimming opportunities. Part of the lake is adjacent to Riverside State Park, which includes more than 500 acres of land donated by Avista.
Development Information
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Location: On Spokane River, approximately 30 miles northwest of Spokane
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Initial Operation: 1915
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Generating Units: 4 Francis turbines
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Generating Capacity: 71 megawatts
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Crest Length of Dam: 593 feet
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Height Of Dam: 213 feet
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Spillgates: 8
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Reservoir Length: 23.5 miles
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Normal Summer Reservoir Elevation: Near 1536 feet (Avista datum)
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Storage: 105,000 acre feet
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Minimum Flow: none