A few recent images posted below showing Wanapum Dam and the surrounding area. This stretch of the Columbia River was swept by the Ice Age Floods at the end of the most recent Ice Age.
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Visit: HUGEfloods.com to learn more about the Ice Age Floods.
Wanapum Dam (left) and I-90 crossing Columbia River (right). Vantage, WA at west end of bridge (view north). Image taken February 2014.
Wanapum Dam - February 2014
According to the guy on TV ... Crack is below the "fourth spillway gate".
Gates are numbered west to east. When I took this photo earlier in month ... there was more water leaking by the fourth gate from the west than any other. I know nothing about dam gate alignment ... water shown passing gate in photo may be completely normal. Rooting for a safe and speedy repair.
Interstate 90 Bridge at Vantage, WA. - February 2014
View south to Wanapum Dam and Sentinel Gap. Vantage, WA at right (photo a couple years old).
Wikipedia's Wanapum Dam page: Wanapum Dam