Cascade Dam
Cascade Dam
Location in the United States Show map of the United States Lake Cascade (Idaho) Show map of Idaho
Country	United States
Location	Valley County, Idaho
Coordinates	44°31′26″N 116°03′04″W / 44.524°N 116.051°W / 44.524; -116.051
Purpose	Water storage
Construction began	1942, 1946
Opening date	1948; 76 years ago (1948)
Owner(s)	U.S. Bureau of Reclamation
Dam and spillways
Type of dam	Zoned earthfill
Impounds	N. Fork Payette River
Height	107 ft (33 m)
Length	785 ft (239 m)
Width (base)	45 ft (14 m)
Reservoir
Creates	Lake Cascade
Total capacity	693,100 acre-feet (854,900,000 m3)
Catchment area	620 sq mi (1,610 km2).
Surface area	47 sq mi (122 km2)
Normal elevation	4,828 ft (1,472 m)

Lake Cascade (formerly Cascade Reservoir),^[1] is a reservoir in the western United States, on the North Fork of the Payette River in Valley County, Idaho. Located in the Boise National Forest, it has a surface area of 47 square miles (122 km²), and is the fourth largest lake or reservoir in the state. The closest cities are Cascade, Donnelly, and McCall, all in the Long Valley of Valley County.

Following a delay due to World War II, the earthen dam was built by the Bureau of Reclamation, completed 76 years ago in 1948.^[2] The term "Lake Cascade" came into common use in the 1990s, with the federal name change made in 1999.^[1]

Recreation

The lake contains perch, trout, smallmouth bass, Kokanee salmon, and Coho salmon for anglers and there is a beautiful winter ice fishing season. Lake Cascade State Park has several units around the lake.

Sport fish restoration

In 2003 the Idaho Department of Fish and Game (IDFG) proposed draining Lake Cascade to facilitate the removal of pikeminnow and the addition of sport fish, such as perch. Pikeminnows are considered problematic to sport fishing in Lake Cascade because they are predators that live up to 15 years and compete for food stocks.^[3] Issues involved in mitigating damage during the lowering of the lake level include maintaining an adequate supply for irrigation, providing a steady stream for power, maintaining salmon flow augmentation, and other water rights. The U.S. Bureau of Reclamation manages the reservoir and estimated the draining could take place over the course of a year at a cost of $100,000 to $300,000.^[4] The U. S. Bureau of Reclamation withdrew its application for an Environmental Impact Statement studying the drawdown citing "that the draining of Lake Cascade is not a viable option for sport fish restoration."^[5]

Water quality

The lake experienced a bloom of blue-green algae in 1993 caused by low water, high phosphorus content, and hot weather. Studies of water quality found phosphorus to be present in high levels which contributed to the algal bloom. Beginning in 1995, the water quality was monitored and an improvement plan was implemented to lower the phosphorus by 37 percent. By 2003 the lake had 57 percent less phosphorus than the initial monitoring in 1995 due to the best management practices adopted in the drainage basin of the lake.^[6]

Tamarack Resort

Tamarack Resort is located on the west shore of the reservoir, southwest of Donnelly.