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Twin Sisters Rock
Twin Sisters are two pillars of basalt that jut from the cliffs along Wallula Gap overlooking the Columbia River. Geologists say the rock formation is the result of erosion from a great flood near the end of the last Ice Age, about 12,000 to 15,000 years ago.
From Pasco, drive east on US 12, crossing the Snake River, and continue east to a junction with State Route 730 (found just after crossing the Walla Walla River. Turn right onto SR 730 and continue 2 miles to find the signed pullout parking area at the base of Twin Sisters on the left.
Recent Trip Reports
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There are 2 trip reports for this hike.
Twin Sisters Rock — May 06, 2012 — altaholi
Features: Wildflowers blooming
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checked out this hike with my husband, 4yr old and one year old in the backpack. had some rough par...
checked out this hike with my husband, 4yr old and one year old in the backpack. had some rough parts for the four year old but nothing that we couldn't handle by holding her hand. you can walk around both sister separately and together. overall a great hike.
Twin Sisters Rock — Feb 23, 2005 — M&S
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A late afternoon exploration of this beautiful place at the Wallula Gap of the Columbia R.- hike #5...
A late afternoon exploration of this beautiful place at the Wallula Gap of the Columbia R.- hike #57 in the great new ""Best Desert Hikes Washington"" by Alan L. Bauer and Dan A. Nelson. Located SE of Pasco on the way to Walla Walla, the Twin Sisters overlook a most stunning view of the Wallula Gap- where the Columbia flows thru a ""narrow"" cut in the basalt plateau, where tens of thousands of years ago the immense ice age ancient L. Missoula floods were forced to squeeze through this narrow gap and the subsequent gigantic backup of floodwaters created temporary huge lakes themselves behind it.