Bonneville Dam

 dam, lock (water navigation), hydroelectric power station/plant

Bonneville Lock and Dam (IPA: /ˈbɑnəvɪl/) consists of several dam structures that together complete a span of the Columbia River between the US states of Oregon and Washington at River Mile 146.1. The dam is located 40 miles east of Portland, Oregon, in the Columbia River Gorge. The primary functions of Bonneville Lock and Dam are those of electrical power generation and river navigation. The dam was built and is managed by the US Army Corps of Engineers. Electrical power generated at Bonneville is distributed by the Bonneville Power Administration. Bonneville Lock and Dam is named for Army Capt. Benjamin Bonneville, an early explorer credited with charting much of the Oregon Trail.

* First Powerhouse – Constructed in 1933-37; 313 m (1,027 ft) long; 10 generators with an output capacity of 526,700 kW.
* Spillway – Constructed 1933-37; 18 gates over a length of 442 m ( 1450 ft); maintains the reservoir (upriver) usually 18 m (60 ft) above the river on the downstream side;
* Second Powerhouse – Constructed 1974-81; 300.5 m (986 ft) long; 8 generators (plus two at fish ladders) with a total generating capacity of 558,200 kW.
* Bonneville Lock – Constructed in 1993 at a cost of $341 million; 26 m (86 ft) wide, 206 m (675 ft) long; transit time is approx. 30 minutes.
* Lake Bonneville – 77 km (48 mi) long reservoir on the Columbia River created by Bonneville Dam; part of the Columbia-Snake Inland Waterway.