Bonneville Dam

Bonneville Lock and Dam /ˈbɒnəvɪl/ consists of several run-of-the-river dam structures that together complete a span of the Columbia River between the U.S. states of Oregon and Washington at River Mile 146.1.^[6] The dam is located 40 miles (64 km) east of Portland, Oregon, in the Columbia River Gorge. The primary functions of Bonneville Lock and Dam are electrical power generation and river navigation. The dam was built and is managed by the United States Army Corps of Engineers. At the time of its construction in the 1930s it was the largest water impoundment project of its type in the nation, able to withstand flooding on an unprecedented scale.^[7] Electrical power generated at Bonneville is distributed by the Bonneville Power Administration. Bonneville Dam is named for Army Capt. Benjamin Bonneville, an early explorer credited with charting much of the Oregon Trail. The Bonneville Dam Historic District was designated a National Historic Landmark District in 1987.^[5]

History

In 1896, prior to this damming of the river, the Cascade Locks and Canal were constructed, allowing ships to pass the Cascades Rapids, located several miles upstream of Bonneville.

Prior to the

Both the cascades and the old lock structure were submerged by the Bonneville Reservoir, also known as Lake Bonneville, the reservoir that formed behind the dam. The original navigation lock at Bonneville opened in 1938 and was, at that time, the highest single-lift lock in the world, with a vertical lift of 60 feet.^[12] Although the dam began to produce hydroelectricity in 1937, commercial electricity began its transfer from the dam in 1938.^[9]

A second powerhouse and dam structure were started in 1974 and completed in 1981. The second powerhouse was built by widening the river channel on the Washington side, creating Cascades Island between the new powerhouse and the original spillway. The combined rated capacity electrical output of the two power houses at Bonneville is now 1.2 gigawatts.

Despite its world record size in 1938, Bonneville Lock became the smallest of eight locks, including seven built subsequently at different locations upstream on the Columbia and Snake rivers. Eventually a new lock was needed at Bonneville; this new structure was built on the Oregon shore, opening to ship and barge traffic in 1993. The old lock is still present, but it is no longer used.

The largest fish hatchery in Oregon, called Bonneville Fish Hatchery, is located next to Bonneville Dam. It is a tourist destination that is often connected to Bonneville Dam tourism.

Dimensions and statistics

• Owner:
  U.S. Army Corps of Engineers, Portland District^[2]
• Location: On Columbia River about 40 miles upstream from Portland, Oregon^[2]
• First Powerhouse – Constructed in 1933–37; Dam 313 m (1,027 ft) long x 77 feet (23 m) high forebay; 10 generators with a nominal total output capacity of 526.7
  MW; Overload capacity 577 MW.^[2]
• Spillway – Constructed 1933–37; 18 gates over a length of 442 m (1,450 ft); maintains the reservoir (upriver) usually 18 m (59 ft) above the river on the downstream side;[2]
• Second Powerhouse – Constructed 1974–82; Dam 300.5 m (986 ft) long x 77 feet (23 m) high forebay; 8 generators (plus two at fish ladders) with a nominal total generating capacity of 558.2 MW; Overload capacity 612 MW.^[2]
• Bonneville Lock – Constructed from 1987 to 1993 at a cost of $341 million; 26 m (85 ft) wide, 206 m (676 ft) long; transit time is approx. 30 minutes. Replaced earlier smaller lock built 1938.^[2]
• Lake Bonneville – 77 km (48 mi) long reservoir on the Columbia River created by Bonneville Dam; part of the Columbia-Snake Inland Waterway.^[2]

It was declared a National Historic Landmark in 1987.^[5][7]

• both powerhouses - output capacity: 1.2
  GW

Environmental and social implications

The Bonneville Dam blocked the migration of white sturgeon to their upstream spawning areas. Sturgeon still spawn in the area below the dam, and the lower Columbia River supports a healthy sturgeon population. Small, very depressed populations of white sturgeon persist in the various reservoirs upstream.

To cope with fish migration problems, the dam features

Creating electricity was a sensitive issue at the time of the Bonneville Dam's construction, which was funded with federal dollars. The Franklin D. Roosevelt administration wanted the electricity produced to be a public source of power and prevent energy monopolies. Advocates for private sale of the electricity were opposed to this, and they did not want the government to interfere. In 1937, the Bonneville Project Act was signed by Roosevelt, giving the dam's power over to the public and creating the Bonneville Power Administration (BPA). A rate of $17.50 per kilowatt-year (about 0.2 cents/kWh) was maintained by the BPA for the next 28 years.^[9]

Power production is the primary function of the Bonneville Dam. The two Bonneville powerhouses generate about 5 billion kWh of electricity each year. The Bonneville Dam supplies nearly 500,000 homes with electricity, assuming each household consumes 10,000 kWh of electricity per year. In 1998, its generation costs were about 1.2 cents/kWh, which was much higher than historic costs mainly because the Bonneville Power Administration (BPA) was still paying off the second powerhouse which was built in 1982. Consumers were charged 2.3 cents/kWh to account for transmission and other costs.^[18]

Gallery

• 
  Generators inside the second powerhouse
• 
  View inside of powerhouse two of Bonneville Dam
• 
  Fish ladder at Bonneville Dam
• 
  Children watch fish through a viewing window
• 
  Pacific lamprey attached to glass
• 
  Aerial view of spillway flanked by powerhouses, Bonneville Lock (near right) and Lake
• 
  A Bonneville Dam Kaplan turbine after 61 years of service
• 
  View of Bonneville Dam
• 
  Spillway from the air
• 
  The swing bridge begins to open as a barge approaches the Bonneville Navigation Locks
• 
  The swing bridge is open as a barge approaches the Bonneville Navigation Locks
• 
  The original downstream gates of the old Bonneville Navigation Locks
• 
  A view of the first powerhouse
• 
  A guardhouse constructed during World War II
• 
  Post insulators and a bus bar at the visitors center
• 
  A Tainter valve at the navigation locks visitors center
• 
  Pacific Northwest River System
• 
  Public Works Administration Project, Bonneville Dam in Oregon, "Excavation for Navigation Lock and Approach Channel" - NARA – 197161

See also

• Cascade Locks and Canal, which preceded the construction of the dam
• Grand Coulee Dam, a much larger dam far upstream on the Columbia River
• Charles McNary
  , a U.S. Senator from Oregon who was instrumental in passing legislation to build the dam
• List of dams in the Columbia River watershed

References

• Bonneville Lock and Dam. A National Historic Landmark Serving the Northwest. 2001. U.S. Government Printing Office, 2001-691-677. U.S. Army Corps of Engineers, Portland District, public information pamphlet distributed at the Bonneville Lock and Dam visitor centers.
• "Bonneville Lock and Dam: A Gift from the People of the Great Depression." Barry, Joseph Patrick, published by Retired Ranger and Associates, 296 pages, October, 2017

External links

Wikimedia Commons has media related to Bonneville Dam.

• U.S. Army Corps of Engineers – Bonneville Lock and Dam
• Bonneville Power Administration
• Historic American Engineering Record (HAER) No. OR-11, "Bonneville Project", 42 photos, 75 data pages, 4 photo caption pages
• HAER No. OR-11-F, "Bonneville Project, Bonneville Dam", 129 photos, 12 photo caption pages